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FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 130 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. 100000 Shareholder Fees (Fees paid directly from your investment) 0.0225 0 0 0 0 0 0.0100 0 0 0 Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) 0.0034 0.0034 0.0034 0.0034 0.0034 0.0020 0.0083 0.0010 0 0 0.0013 0.0013 0.0013 0.0009 0.0013 0.0067 0.0130 0.0057 0.0043 0.0047 -0.0002 -0.0002 -0.0002 -0.0002 -0.0002 0.0065 0.0128 0.0055 0.0041 0.0045 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 290 433 588 1039 290 433 588 1039 230 410 711 1392 130 410 711 1392 56 181 316 712 56 181 316 712 42 136 239 540 42 136 239 540 46 149 261 590 46 149 261 590 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 64% of the average value of its portfolio. 0.64 PRINCIPAL INVESTMENT STRATEGIES Under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds that pay interest exempt from federal income tax. The Fund uses the volatility of the Bloomberg Municipal Bond Short 1-5 Year Index as an approximation of reasonable risk.Under normal conditions, the Fund invests in investment grade municipal bonds, which are bonds that are rated BBB/Baa or higher (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality. The Fund may invest up to 20% of its net assets in lower rated municipal bonds (commonly referred to as “below investment grade,” “high yield,” or “junk” bonds), which are bonds that are rated BB+/Ba1 or lower (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality. The Fund may invest in all types of municipal bonds, including general obligation bonds, revenue bonds, municipal leases, and variable rate demand notes. The Fund may invest in both insured and uninsured municipal bonds. The Fund also may invest in zero coupon, deferred interest, pay-in-kind, and capital appreciation bonds. The Fund may invest up to 20% of its net assets in municipal bonds that pay interest that is subject to the federal alternative minimum tax (“AMT”), including private activity bonds (commonly referred to as “AMT paper”). Although the Fund is permitted to invest up to 20% of its net assets in fixed income securities that pay interest that is subject to regular federal income tax, the Fund presently has no intention of investing in this manner. There is a risk that a bond issued as tax-exempt may be reclassified by the Internal Revenue Service (“IRS”) as taxable. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region. The Fund may invest up to 20% of its net assets in inverse floaters (also known as “residual interest bonds”), which are a type of derivative investment that provides leveraged exposure to underlying municipal bonds whose interest payments vary inversely with changes in short-term tax-exempt interest rates. The Fund also may invest in other types of derivatives, such as futures, for non-hedging, hedging, or duration management purposes.The Fund may invest in individual securities of any maturity or duration. Normally, the Fund seeks to maintain a dollar-weighted average maturity of between one and five years. Although the Fund may invest significantly in money market securities and their equivalents for investment purposes as well as for cash management purposes, it is not a money market fund and is not subject to the regulatory requirements applicable to money market funds.The Fund’s portfolio management team focuses on credit risk analysis, tax-exempt income yield, total return potential, interest rate risk, and call protection in managing its portfolio. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment or shows signs of deteriorating fundamentals, among other reasons.The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Fixed Income Securities Risk: The Fund is subject to the general risks and considerations associated with investing in debt securities, including the risk that issuers will fail to make timely payments of principal or interest or default altogether. Lower-rated securities in which the Fund may invest may be more volatile and may decline more in price in response to negative issuer developments or general economic news due to their increased credit risk relative to other fixed-income investments. In addition, as interest rates rise, the Fund’s investments typically will lose value. Fiscal, economic, monetary, or other governmental policies or measures have in the past—and may in the future—cause or exacerbate interest rate risks. · Municipal Securities Risk: Municipal securities are subject to the same risks affecting fixed income securities in general. In addition, the prices of municipal securities may be adversely affected by legislative or political changes, tax rulings, judicial action, changes in market and economic conditions, and the fiscal condition of the municipal issuer, including an insolvent municipality filing for bankruptcy. The Fund may be more sensitive to these events and conditions if it invests a substantial portion of its assets in the municipal securities of similar projects (such as those relating to education, health care, housing, transportation, and utilities), in particular types of municipal securities (such as general obligation bonds, private activity bonds, and special tax bonds), or in the securities of issuers located within a single state, municipality, territory (such as Puerto Rico), or geographic area. The market for municipal securities generally is less liquid than other securities markets, which may make it more difficult for the Fund to sell its municipal securities. Nongovernmental users of facilities financed by tax-exempt revenue bonds (e.g., companies in the electric utility and health care industries) may have difficulty making payments on their obligations in the event of an economic downturn. This would negatively affect the valuation of municipal securities issued by such facilities. · Below Investment Grade Municipal Bond Risk: Below investment grade municipal bonds typically pay a higher yield than investment grade municipal bonds, but have greater price fluctuations and a higher risk of default than investment grade municipal bonds. The market for below investment grade municipal bonds may be less liquid due to such factors as specific municipal developments, interest rate sensitivity, negative perceptions of the junk bond markets generally, and less secondary market liquidity. This may make such bonds more difficult to sell at an acceptable price, especially during periods of financial distress, increased market volatility, or significant market decline. · Call Risk: A substantial portion of bonds are “callable,” meaning they give the issuer the right to call or redeem the bonds before maturity. Issuers may call outstanding bonds when there is a decline in interest rates, when credit spreads change, or when the issuer’s credit quality improves. As interest rates decline, these bond issuers may pay off their loans early by buying back the bonds, thus depriving the Fund of above market interest rates. · Credit Risk: Municipal bonds are subject to the risk that the issuer or guarantor of a security may not make interest and principal payments as they become due or may default altogether. In addition, if the market perceives a deterioration in the creditworthiness of an issuer, the value and liquidity of bonds issued by that issuer may decline. Credit risk varies based upon the economic and fiscal conditions of each issuer and the municipalities, agencies, instrumentalities, and other issuers within the state, territory, or possession. To the extent that the Fund holds below investment grade securities, these risks may be heightened. Insured municipal bonds have the credit risk of the insurer in addition to the credit risk of the underlying investment being insured. A decline in the credit quality of private activity bonds usually is directly related to a decline in the credit standing of the private user of the facility. · Derivatives Risk: The risks associated with derivatives may be different from and greater than the risks associated with directly investing in securities and other investments. Derivatives may increase the Fund’s volatility and reduce its returns. Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful may depend on, among other things, the portfolio managers’ ability to correctly forecast market movements, company and industry valuation levels and trends, changes in foreign exchange and interest rates, and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. Derivatives are also subject to liquidity risk and the risk that the counterparty to a derivative transaction may fail to fulfill its contractual obligations under the derivative contract. In addition, given their complexity, derivatives are subject to the risk that improper or misunderstood documentation may expose the Fund to losses. · Inverse Floater Risk: The Fund’s use of inverse floaters may reduce the Fund’s returns and/or increase the Fund’s volatility. Distributions on inverse floaters are inversely related to short-term municipal bond interest rates. Therefore, distributions paid to the Fund on its inverse floaters will fall when short-term municipal interest rates rise and will rise when short-term municipal interest rates fall. Holders of inverse floaters bear the risk of the fluctuation in value of the issuing trust’s underlying municipal bonds because holders of the floaters have the right to tender their notes back to the trust for payment at par plus accrued interest. This creates effective leverage because the Fund’s net cash investment is significantly less than the value of the underlying bonds. The leverage ratio increases as the value of the inverse floaters becomes a greater proportion of the value of the municipal bonds deposited into the trust. · Extension Risk: Rising interest rates may cause an issuer to pay off or retire a debt security later than expected, extending the duration of a bond, making it more sensitive to changes in interest rates reducing the bond’s value. · Governmental Risk: Government actions, including U.S. federal government actions and actions by local, state, and regional governments, could have an adverse effect on municipal bond prices. In addition, the Fund’s performance may be affected by local, state, and regional factors depending on the states or territories in which the Fund’s investments are issued. · Interest Rate Risk: As interest rates rise, prices of bonds (including tax-exempt bonds) generally fall, typically causing the Fund’s investments to lose value. Additionally, rising interest rates or lack of market participants may lead to decreased liquidity in fixed income markets. Interest rate changes generally have a more pronounced effect on the market value of fixed-rate instruments, such as corporate bonds, than they have on floating rate instruments, and typically have a greater effect on the price of fixed income securities with longer durations. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation, and changes in general economic conditions. · Municipal Asset-Backed Securities Risk: A municipal asset-backed security is a type of pass-through instrument structured as a loan or note that pays interest that is eligible for exclusion from federal and state income taxation based upon the income from a collateralized underlying municipal asset or pool of municipal assets. Municipal asset-backed securities bear the risk that the underlying municipal assets will not be paid by issuers or by credit insurers or guarantors of such instruments. Some municipal asset-backed securities are unsecured or secured by lower-rated insurers or guarantors and thus may involve greater risk. Municipal asset-backed securities are subject to interest rate risk, credit risk and market risk. Certain municipal asset-backed securities are particularly susceptible to prepayment and extension risks, because prepayments on the underlying assets tend to increase when interest rates fall and decrease when interest rates rise. When market interest rates increase, refinancings and prepayments slow, which lengthens the effective duration of these securities. As a result, the negative effect of the interest rate increase on the market value of municipal asset-backed securities is usually more pronounced than it is for other types of fixed income securities, potentially increasing the volatility of the Fund. Conversely, when market interest rates decline, while the value of municipal asset-backed securities may increase, the rates of prepayment of the underlying assets tend to increase, which shortens the effective duration of these securities. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. · Short Duration Risk: Although any rise in interest rates is likely to cause the prices of debt obligations to fall, the comparatively short duration of the Fund’s portfolio holdings is intended to mitigate some of this risk. The Fund generally will earn less income and, during periods of declining interest rates, will provide lower total returns to investors than funds with longer durations. · State and Territory Risk: From time to time, the Fund may be more exposed to risks affecting a particular state, territory (such as Puerto Rico), municipality, or region. As a result, adverse economic, political, and regulatory conditions affecting a single state, territory, municipality, or region (and their political subdivisions, agencies, instrumentalities, and public authorities) can disproportionately affect the Fund’s performance. · Taxability Risk: Although the Fund attempts to purchase only bona fide tax-exempt securities (except for its ability to invest up to 20% of its net assets in municipal bonds that pay interest subject to AMT and fixed income securities that pay interest that is subject to regular U.S. federal and state and local income taxes, as applicable), there is a risk that a bond issued as tax-exempt may be reclassified by the IRS as taxable (for example, if the bond was issued in a transaction deemed by the IRS to be abusive), creating taxable rather than tax-exempt income. Additionally, the Fund’s use of derivatives may increase the amount of distributions taxable to you as ordinary income, increase or decrease the amount of capital gain distributions to you, and/or decrease the amount available for distribution to you as exempt-interest dividends. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 4th Q 2023 +2.49% Worst Quarter 1st Q 2022 -3.40% Best Quarter 2023-12-31 0.0249 Worst Quarter 2022-03-31 -0.0340 The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.1The Fund has adopted the Bloomberg U.S. Aggregate Bond Index as its broad-based securities market index. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) 0.0126 0.0066 0.0114 0.0126 0.0065 0.0114 0.0189 0.0096 0.0126 0.0196 0.0049 0.0074 0.0372 0.0122 0.0147 0.0393 0.0137 0.0177 2017-04-04 0.0389 0.0133 0.0158 Bloomberg Municipal Bond Short 1-5 Year Index 0.0411 0.0136 0.0167 0.0176 2017-04-04 (reflects no deduction for fees, expenses, or taxes) Bloomberg U.S. Aggregate Bond Index 0.0730 -0.0036 0.0201 0.0187 2017-04-04 Intermediate Tax Free Fund INVESTMENT OBJECTIVE The investment objective of the Fund is to seek the maximum amount of interest income exempt from federal income tax as is consistent with reasonable risk. FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 130 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. 100000 Shareholder Fees (Fees paid directly from your investment) 0.0225 0 0 0 0 0 0 0.0100 0 0 0 0 Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) 0.0038 0.0038 0.0038 0.0038 0.0038 0.0038 0.0020 0.0082 0.0010 0 0 0.0045 0.0014 0.0014 0.0014 0.0009 0.0014 0.0014 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0013 0.0013 0.0013 0.0008 0.0013 0.0013 0.0072 0.0134 0.0062 0.0047 0.0052 0.0097 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 297 450 617 1099 297 450 617 1099 236 425 734 1442 136 425 734 1442 63 199 346 774 63 199 346 774 48 151 263 591 48 151 263 591 53 167 291 653 53 167 291 653 99 309 536 1190 99 309 536 1190 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 49% of the average value of its portfolio. 0.49 PRINCIPAL INVESTMENT STRATEGIES Under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds that pay interest exempt from federal income tax. The Fund uses the volatility of the Bloomberg 1-15 Year Municipal Bond Index as an approximation of reasonable risk.Under normal conditions, the Fund invests in investment grade municipal bonds, which are bonds that are rated BBB/Baa or higher (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord, Abbett & Co. LLC (“Lord Abbett”) to be of comparable quality. The Fund may invest up to 20% of its net assets in lower rated municipal bonds (commonly referred to as “below investment grade,” “high yield,” or “junk” bonds), which are bonds that are rated BB+/Ba1 or lower (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality.The Fund may invest in all types of municipal bonds, including general obligation bonds, revenue bonds, municipal leases, and variable rate demand notes. The Fund may invest in both insured and uninsured municipal bonds. The Fund also may invest in zero coupon, deferred interest, pay-in-kind, and capital appreciation bonds.The Fund may invest up to 20% of its net assets in municipal bonds that pay interest that is subject to the federal alternative minimum tax (‘‘AMT’’), including private activity bonds (commonly referred to as ‘‘AMT paper’’). Although the Fund is permitted to invest up to 20% of its net assets in fixed income securities that pay interest that is subject to regular federal income tax, the Fund presently has no intention of investing in this manner. There is a risk that a bond issued as tax-exempt may be reclassified by the Internal Revenue Service (‘‘IRS’’) as taxable. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any ‘‘industry’’ for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region.The Fund may invest up to 20% of its net assets in inverse floaters (also known as ‘‘residual interest bonds’’), which are a type of derivative investment that provides leveraged exposure to underlying municipal bonds whose interest payments vary inversely with changes in short-term tax-exempt interest rates. The Fund also may invest in other types of derivatives, such as futures, for non-hedging, hedging, or duration management purposes.The Fund may invest in individual securities of any maturity or duration. Normally, the Fund seeks to maintain a dollar-weighted average maturity of between five and twelve years. The Fund may invest in money market securities and their equivalents, typically for cash management purposes.The Fund’s portfolio management team focuses on credit risk analysis, tax-exempt income yield, total return potential, interest rate risk, and call protection in managing its portfolio. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment or shows signs of deteriorating fundamentals, among other reasons. The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any ‘‘industry’’ for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Fixed Income Securities Risk: The Fund is subject to the general risks and considerations associated with investing in debt securities, including the risk that issuers will fail to make timely payments of principal or interest or default altogether. Lower-rated securities in which the Fund may invest may be more volatile and may decline more in price in response to negative issuer developments or general economic news due to their increased credit risk relative to other fixed-income investments. In addition, as interest rates rise, the Fund’s investments typically will lose value. Fiscal, economic, monetary, or other governmental policies or measures have in the past—and may in the future—cause or exacerbate interest rate risks. · Municipal Securities Risk: Municipal securities are subject to the same risks affecting fixed income securities in general. In addition, the prices of municipal securities may be adversely affected by legislative or political changes, tax rulings, judicial action, changes in market and economic conditions, and the fiscal condition of the municipal issuer, including an insolvent municipality filing for bankruptcy. The Fund may be more sensitive to these events and conditions if it invests a substantial portion of its assets in the municipal securities of similar projects (such as those relating to education, health care, housing, transportation, and utilities), in particular types of municipal securities (such as general obligation bonds, private activity bonds, and special tax bonds), or in the securities of issuers located within a single state, municipality, territory (such as Puerto Rico), or geographic area. The market for municipal securities generally is less liquid than other securities markets, which may make it more difficult for the Fund to sell its municipal securities. Nongovernmental users of facilities financed by tax-exempt revenue bonds (e.g., companies in the electric utility and health care industries) may have difficulty making payments on their obligations in the event of an economic downturn. This would negatively affect the valuation of municipal securities issued by such facilities. · Below Investment Grade Municipal Bond Risk: Below investment grade municipal bonds typically pay a higher yield than investment grade municipal bonds, but have greater price fluctuations and a higher risk of default than investment grade municipal bonds. The market for below investment grade municipal bonds may be less liquid due to such factors as specific municipal developments, interest rate sensitivity, negative perceptions of the junk bond markets generally, and less secondary market liquidity. This may make such bonds more difficult to sell at an acceptable price, especially during periods of financial distress, increased market volatility, or significant market decline. · Call Risk: A substantial portion of bonds are “callable,” meaning they give the issuer the right to call or redeem the bonds before maturity. Issuers may call outstanding bonds when there is a decline in interest rates, when credit spreads change, or when the issuer’s credit quality improves. As interest rates decline, these bond issuers may pay off their loans early by buying back the bonds, thus depriving the Fund of above market interest rates. · Credit Risk: Municipal bonds are subject to the risk that the issuer or guarantor of a security may not make interest and principal payments as they become due or may default altogether. In addition, if the market perceives a deterioration in the creditworthiness of an issuer, the value and liquidity of bonds issued by that issuer may decline. Credit risk varies based upon the economic and fiscal conditions of each issuer and the municipalities, agencies, instrumentalities, and other issuers within the state, territory, or possession. To the extent that the Fund holds below investment grade securities, these risks may be heightened. Insured municipal bonds have the credit risk of the insurer in addition to the credit risk of the underlying investment being insured. A decline in the credit quality of private activity bonds usually is directly related to a decline in the credit standing of the private user of the facility. · Derivatives Risk: The risks associated with derivatives may be different from and greater than the risks associated with directly investing in securities and other investments. Derivatives may increase the Fund’s volatility and reduce its returns. Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful may depend on, among other things, the portfolio managers’ ability to correctly forecast market movements, company and industry valuation levels and trends, changes in foreign exchange and interest rates, and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. Derivatives are also subject to liquidity risk and the risk that the counterparty to a derivative transaction may fail to fulfill its contractual obligations under the derivative contract. In addition, given their complexity, derivatives are subject to the risk that improper or misunderstood documentation may expose the Fund to losses. · Inverse Floater Risk: The Fund’s use of inverse floaters may reduce the Fund’s returns and/or increase the Fund’s volatility. Distributions on inverse floaters are inversely related to short-term municipal bond interest rates. Therefore, distributions paid to the Fund on its inverse floaters will fall when short-term municipal interest rates rise and will rise when short-term municipal interest rates fall. Holders of inverse floaters bear the risk of the fluctuation in value of the issuing trust’s underlying municipal bonds because holders of the floaters have the right to tender their notes back to the trust for payment at par plus accrued interest. This creates effective leverage because the Fund’s net cash investment is significantly less than the value of the underlying bonds. The leverage ratio increases as the value of the inverse floaters becomes a greater proportion of the value of the municipal bonds deposited into the trust. · Extension Risk: Rising interest rates may cause an issuer to pay off or retire a debt security later than expected, extending the duration of a bond, making it more sensitive to changes in interest rates reducing the bond’s value. · Governmental Risk: Government actions, including U.S. federal government actions and actions by local, state, and regional governments, could have an adverse effect on municipal bond prices. In addition, the Fund’s performance may be affected by local, state, and regional factors depending on the states or territories in which the Fund’s investments are issued. · Interest Rate Risk: As interest rates rise, prices of bonds (including tax-exempt bonds) generally fall, typically causing the Fund’s investments to lose value. Additionally, rising interest rates or lack of market participants may lead to decreased liquidity in fixed income markets. Interest rate changes generally have a more pronounced effect on the market value of fixed-rate instruments, such as corporate bonds, than they have on floating rate instruments, and typically have a greater effect on the price of fixed income securities with longer durations. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation, and changes in general economic conditions. · Municipal Asset-Backed Securities Risk: A municipal asset-backed security is a type of pass-through instrument structured as a loan or note that pays interest that is eligible for exclusion from federal and state income taxation based upon the income from a collateralized underlying municipal asset or pool of municipal assets. Municipal asset-backed securities bear the risk that the underlying municipal assets will not be paid by issuers or by credit insurers or guarantors of such instruments. Some municipal asset-backed securities are unsecured or secured by lower-rated insurers or guarantors and thus may involve greater risk. Municipal asset-backed securities are subject to interest rate risk, credit risk and market risk. Certain municipal asset-backed securities are particularly susceptible to prepayment and extension risks, because prepayments on the underlying assets tend to increase when interest rates fall and decrease when interest rates rise. When market interest rates increase, refinancings and prepayments slow, which lengthens the effective duration of these securities. As a result, the negative effect of the interest rate increase on the market value of municipal asset-backed securities is usually more pronounced than it is for other types of fixed income securities, potentially increasing the volatility of the Fund. Conversely, when market interest rates decline, while the value of municipal asset-backed securities may increase, the rates of prepayment of the underlying assets tend to increase, which shortens the effective duration of these securities. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. · State and Territory Risk: From time to time, the Fund may be more exposed to risks affecting a particular state, territory (such as Puerto Rico), municipality, or region. As a result, adverse economic, political, and regulatory conditions affecting a single state, territory, municipality, or region (and their political subdivisions, agencies, instrumentalities, and public authorities) can disproportionately affect the Fund’s performance. · Taxability Risk: Although the Fund attempts to purchase only bona fide tax-exempt securities (except for its ability to invest up to 20% of its net assets in municipal bonds that pay interest subject to AMT and fixed income securities that pay interest that is subject to regular U.S. federal and state and local income taxes, as applicable), there is a risk that a bond issued as tax-exempt may be reclassified by the IRS as taxable (for example, if the bond was issued in a transaction deemed by the IRS to be abusive), creating taxable rather than tax-exempt income. Additionally, the Fund’s use of derivatives may increase the amount of distributions taxable to you as ordinary income, increase or decrease the amount of capital gain distributions to you, and/or decrease the amount available for distribution to you as exempt-interest dividends. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. No performance is shown for Class P shares because the Fund has no Class P shares outstanding. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 4th Q 2023 +6.23% Worst Quarter 1st Q 2022 -6.67% Best Quarter 2023-12-31 0.0623 Worst Quarter 2022-03-31 -0.0667 The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.1The Fund has adopted the Bloomberg U.S. Aggregate Bond Index as its broad-based securities market index. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) 0.0221 0.0040 0.0190 0.0220 0.0039 0.0189 0.0269 0.0091 0.0205 0.0307 0.0022 0.0150 0.0482 0.0095 0.0223 0.0499 0.0111 0.0257 2017-04-04 0.0482 0.0105 0.0233 Bloomberg 1-15 Year Municipal Bond Index 0.0518 0.0116 0.0227 0.0241 2017-04-04 (reflects no deduction for fees, expenses, or taxes) Bloomberg U.S. Aggregate Bond Index 0.0730 -0.0036 0.0201 0.0187 2017-04-04 National Tax Free Fund INVESTMENT OBJECTIVE The investment objective of the Fund is to seek the maximum amount of interest income exempt from federal income tax as is consistent with reasonable risk. FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 130 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. 100000 Shareholder Fees (Fees paid directly from your investment) 0.0225 0 0 0 0 0 0 0.0100 0 0 0 0 Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) 0.0038 0.0038 0.0038 0.0038 0.0038 0.0038 0.0020 0.0082 0.0010 0 0 0.0045 0.0022 0.0022 0.0022 0.0018 0.0022 0.0022 0.0010 0.0010 0.0010 0.0010 0.0010 0.0010 0.0012 0.0012 0.0012 0.0008 0.0012 0.0012 0.0080 0.0142 0.0070 0.0056 0.0060 0.0105 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 305 475 659 1193 305 475 659 1193 245 449 776 1533 145 449 776 1533 72 224 390 871 72 224 390 871 57 179 313 701 57 179 313 701 61 192 335 750 61 192 335 750 107 334 579 1283 107 334 579 1283 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 36% of the average value of its portfolio. 0.36 PRINCIPAL INVESTMENT STRATEGIES Under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds that pay interest exempt from federal income tax. The Fund uses the volatility of the Bloomberg Municipal Bond Index as an approximation of reasonable risk.Under normal conditions, the Fund invests in investment grade municipal bonds, which are bonds that are rated BBB/Baa or higher (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord, Abbett & Co. LLC (“Lord Abbett”) to be of comparable quality. The Fund may invest up to 35% of its net assets in lower rated municipal bonds (commonly referred to as “below investment grade,” “high yield,” or “junk” bonds), which are bonds that are rated BB+/Ba1 or lower (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality.The Fund may invest in all types of municipal bonds, including general obligation bonds, revenue bonds, municipal leases, and variable rate demand notes. The Fund may invest in both insured and uninsured municipal bonds. The Fund also may invest in zero coupon, deferred interest, pay-in-kind, and capital appreciation bonds.The Fund may invest up to 20% of its net assets in municipal bonds that pay interest that is subject to the federal alternative minimum tax (“AMT”), including private activity bonds (commonly referred to as “AMT paper”). Although the Fund is permitted to invest up to 20% of its net assets in fixed income securities that pay interest that is subject to regular federal income tax, the Fund presently has no intention of investing in this manner. There is a risk that a bond issued as tax-exempt may be reclassified by the Internal Revenue Service (“IRS”) as taxable. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region.The Fund may invest up to 20% of its net assets in inverse floaters (also known as “residual interest bonds”), which are a type of derivative investment that provides leveraged exposure to underlying municipal bonds whose interest payments vary inversely with changes in short-term tax-exempt interest rates. The Fund also may invest in other types of derivatives, such as futures, for non-hedging, hedging, or duration management purposes.The Fund may invest in individual securities of any maturity or duration. Normally, the Fund seeks to maintain a dollar-weighted average maturity of between twelve and twenty-five years. The Fund may invest in money market securities and their equivalents, typically for cash management purposes.The Fund’s portfolio management team focuses on credit risk analysis, tax-exempt income yield, total return potential, interest rate risk and call protection in managing its portfolio. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment or shows signs of deteriorating fundamentals, among other reasons.The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Fixed Income Securities Risk: The Fund is subject to the general risks and considerations associated with investing in debt securities, including the risk that issuers will fail to make timely payments of principal or interest or default altogether. Lower-rated securities in which the Fund may invest may be more volatile and may decline more in price in response to negative issuer developments or general economic news due to their increased credit risk relative to other fixed-income investments. In addition, as interest rates rise, the Fund’s investments typically will lose value. Fiscal, economic, monetary, or other governmental policies or measures have in the past—and may in the future—cause or exacerbate interest rate risks. · Municipal Securities Risk: Municipal securities are subject to the same risks affecting fixed income securities in general. In addition, the prices of municipal securities may be adversely affected by legislative or political changes, tax rulings, judicial action, changes in market and economic conditions, and the fiscal condition of the municipal issuer, including an insolvent municipality filing for bankruptcy. The Fund may be more sensitive to these events and conditions if it invests a substantial portion of its assets in the municipal securities of similar projects (such as those relating to education, health care, housing, transportation, and utilities), in particular types of municipal securities (such as general obligation bonds, private activity bonds, and special tax bonds), or in the securities of issuers located within a single state, municipality, territory (such as Puerto Rico), or geographic area. The market for municipal securities generally is less liquid than other securities markets, which may make it more difficult for the Fund to sell its municipal securities. Nongovernmental users of facilities financed by tax-exempt revenue bonds (e.g., companies in the electric utility and health care industries) may have difficulty making payments on their obligations in the event of an economic downturn. This would negatively affect the valuation of municipal securities issued by such facilities. · Below Investment Grade Municipal Bond Risk: Below investment grade municipal bonds typically pay a higher yield than investment grade municipal bonds, but have greater price fluctuations and a higher risk of default than investment grade municipal bonds. The market for below investment grade municipal bonds may be less liquid due to such factors as specific municipal developments, interest rate sensitivity, negative perceptions of the junk bond markets generally, and less secondary market liquidity. This may make such bonds more difficult to sell at an acceptable price, especially during periods of financial distress, increased market volatility, or significant market decline. · Call Risk: A substantial portion of bonds are “callable,” meaning they give the issuer the right to call or redeem the bonds before maturity. Issuers may call outstanding bonds when there is a decline in interest rates, when credit spreads change, or when the issuer’s credit quality improves. As interest rates decline, these bond issuers may pay off their loans early by buying back the bonds, thus depriving the Fund of above market interest rates. · Credit Risk: Municipal bonds are subject to the risk that the issuer or guarantor of a security may not make interest and principal payments as they become due or may default altogether. In addition, if the market perceives a deterioration in the creditworthiness of an issuer, the value and liquidity of bonds issued by that issuer may decline. Credit risk varies based upon the economic and fiscal conditions of each issuer and the municipalities, agencies, instrumentalities, and other issuers within the state, territory, or possession. To the extent that the Fund holds below investment grade securities, these risks may be heightened. Insured municipal bonds have the credit risk of the insurer in addition to the credit risk of the underlying investment being insured. A decline in the credit quality of private activity bonds usually is directly related to a decline in the credit standing of the private user of the facility. · Derivatives Risk: The risks associated with derivatives may be different from and greater than the risks associated with directly investing in securities and other investments. Derivatives may increase the Fund’s volatility and reduce its returns. Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful may depend on, among other things, the portfolio managers’ ability to correctly forecast market movements, company and industry valuation levels and trends, changes in foreign exchange and interest rates, and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. Derivatives are also subject to liquidity risk and the risk that the counterparty to a derivative transaction may fail to fulfill its contractual obligations under the derivative contract. In addition, given their complexity, derivatives are subject to the risk that improper or misunderstood documentation may expose the Fund to losses. · Inverse Floater Risk: The Fund’s use of inverse floaters may reduce the Fund’s returns and/or increase the Fund’s volatility. Distributions on inverse floaters are inversely related to short-term municipal bond interest rates. Therefore, distributions paid to the Fund on its inverse floaters will fall when short-term municipal interest rates rise and will rise when short-term municipal interest rates fall. Holders of inverse floaters bear the risk of the fluctuation in value of the issuing trust’s underlying municipal bonds because holders of the floaters have the right to tender their notes back to the trust for payment at par plus accrued interest. This creates effective leverage because the Fund’s net cash investment is significantly less than the value of the underlying bonds. The leverage ratio increases as the value of the inverse floaters becomes a greater proportion of the value of the municipal bonds deposited into the trust. · Extension Risk: Rising interest rates may cause an issuer to pay off or retire a debt security later than expected, extending the duration of a bond, making it more sensitive to changes in interest rates reducing the bond’s value. · Governmental Risk: Government actions, including U.S. federal government actions and actions by local, state, and regional governments, could have an adverse effect on municipal bond prices. In addition, the Fund’s performance may be affected by local, state, and regional factors depending on the states or territories in which the Fund’s investments are issued. · Interest Rate Risk: As interest rates rise, prices of bonds (including tax-exempt bonds) generally fall, typically causing the Fund’s investments to lose value. Additionally, rising interest rates or lack of market participants may lead to decreased liquidity in fixed income markets. Interest rate changes generally have a more pronounced effect on the market value of fixed-rate instruments, such as corporate bonds, than they have on floating rate instruments, and typically have a greater effect on the price of fixed income securities with longer durations. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation, and changes in general economic conditions. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. · State and Territory Risk: From time to time, the Fund may be more exposed to risks affecting a particular state, territory (such as Puerto Rico), municipality, or region. As a result, adverse economic, political, and regulatory conditions affecting a single state, territory, municipality, or region (and their political subdivisions, agencies, instrumentalities, and public authorities) can disproportionately affect the Fund’s performance. · Taxability Risk: Although the Fund attempts to purchase only bona fide tax-exempt securities (except for its ability to invest up to 20% of its net assets in municipal bonds that pay interest subject to AMT and fixed income securities that pay interest that is subject to regular U.S. federal and state and local income taxes, as applicable), there is a risk that a bond issued as tax-exempt may be reclassified by the IRS as taxable (for example, if the bond was issued in a transaction deemed by the IRS to be abusive), creating taxable rather than tax-exempt income. Additionally, the Fund’s use of derivatives may increase the amount of distributions taxable to you as ordinary income, increase or decrease the amount of capital gain distributions to you, and/or decrease the amount available for distribution to you as exempt-interest dividends. · Zero Coupon, Deferred Interest, Pay-In-Kind, and Capital Appreciation Bonds Risk: Because these securities bear no interest and compound semiannually at the rate fixed at the time of issuance, their value generally is more volatile than the value of other fixed income securities. Since the bondholders do not receive interest payments, when interest rates rise, these securities fall more dramatically in value than bonds paying interest on a current basis. When interest rates fall, these securities rise more rapidly in value because the bonds reflect a fixed rate of return. If the issuer defaults, the Fund may not receive any return on its investment.An investment in zero coupon and deferred interest securities may cause the Fund to recognize income and make distributions to shareholders before it receives any cash payments on its investment. To generate cash to satisfy distribution requirements, the Fund may have to sell portfolio securities that it otherwise would have continued to hold or to use cash flows from other sources including the sale of Fund shares. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. No performance is shown for Class P shares because the Fund has not issued Class P shares. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 4th Q 2023 +7.97% Worst Quarter 1st Q 2022 -8.24% Best Quarter 2023-12-31 0.0797 Worst Quarter 2022-03-31 -0.0824 The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.1The Fund has adopted the Bloomberg U.S. Aggregate Bond Index as its broad-based securities market index. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) 0.0017 -0.0024 0.0206 0.0016 -0.0024 0.0205 0.0163 0.0053 0.0231 0.0085 -0.0042 0.0164 0.0267 0.0030 0.0238 0.0272 0.0045 0.0259 2017-04-04 0.0267 0.0040 0.0248 Bloomberg Municipal Bond Index 0.0425 0.0080 0.0234 0.0246 2017-04-04 (reflects no deduction for fees, expenses, or taxes) Bloomberg U.S. Aggregate Bond Index 0.0730 -0.0036 0.0201 0.0187 2017-04-04 High Income Municipal Bond Fund INVESTMENT OBJECTIVE The investment objective of the Fund is to seek a high level of income exempt from federal income tax. FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 130 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. 100000 Shareholder Fees (Fees paid directly from your investment) 0.0225 0 0 0 0 0 0 0.0100 0 0 0 0 Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) 0.0044 0.0044 0.0044 0.0044 0.0044 0.0044 0.0020 0.0083 0.0010 0 0 0.0045 0.0020 0.0020 0.0020 0.0015 0.0020 0.0020 0.0008 0.0008 0.0008 0.0008 0.0008 0.0008 0.0012 0.0012 0.0012 0.0007 0.0012 0.0012 0.0084 0.0147 0.0074 0.0059 0.0064 0.0109 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 309 487 680 1239 309 487 680 1239 250 465 803 1587 150 465 803 1587 76 237 411 918 76 237 411 918 60 189 329 738 60 189 329 738 65 205 357 798 65 205 357 798 111 347 601 1329 111 347 601 1329 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 27% of the average value of its portfolio. 0.27 PRINCIPAL INVESTMENT STRATEGIES Under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds that pay interest exempt from federal income tax. These municipal bonds and other securities in which the Fund may invest may pay interest that is subject to the federal alternative minimum tax (“AMT”) for certain taxpayers. Although the Fund may invest in municipal bonds in any rating category, under normal conditions, the Fund invests at least 50% of its net assets in municipal bonds rated BBB+/Baa1 or lower (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or that are unrated but deemed by Lord, Abbett & Co. LLC (“Lord Abbett”) to be of comparable quality, with a particular emphasis on lower rated municipal bonds (commonly referred to as “below investment grade,” “high yield,” or “junk” bonds), which are bonds that are rated BB+/Ba1 or lower (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality. The Fund may invest without limitation in unrated municipal bonds, which may constitute a significant portion of the Fund’s portfolio. The Fund also may invest in defaulted securities (i.e., bonds on which the issuer has not paid principal or interest on time) and securities of issuers that are or may become involved in reorganizations, financial restructurings, or bankruptcy (commonly referred to as “distressed debt”). The Fund presently does not intend to invest more than 20% of its net assets (measured at the time of investment) in such defaulted or distressed securities. However, the Fund’s defaulted or distressed debt holdings may exceed this level from time to time if the Fund purchased securities that were not considered in default or distressed at their time of purchase and such securities subsequently become defaulted or distressed. These investment strategies are generally higher risk relative to strategies employed by funds that invest primarily in investment grade municipal bonds.The Fund may invest in all types of municipal bonds, including general obligation bonds, revenue bonds, municipal leases, and variable rate demand notes. The Fund may invest in both insured and uninsured municipal bonds. The Fund also may invest in zero coupon, deferred interest, pay-in-kind, and capital appreciation bonds.The Fund may invest up to 100% of its net assets in private activity bonds (commonly referred to as “AMT paper”), which are a type of municipal bond that pays interest that is subject to AMT. Although the Fund is permitted to invest up to 20% of its net assets in fixed income securities that pay interest that is subject to regular federal income tax, the Fund presently has no intention of investing in this manner. There is a risk that a bond issued as tax-exempt may be reclassified by the Internal Revenue Service (“IRS”) as taxable. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region.The Fund may invest up to 100% of its net assets in inverse floaters (also known as “residual interest bonds”), which are a type of derivative investment that provides leveraged exposure to underlying municipal bonds whose interest payments vary inversely with changes in short-term tax-exempt interest rates. The Fund also may invest in other types of derivatives, such as futures, for non-hedging, hedging, or duration management purposes.The Fund may invest in individual securities of any maturity or duration. Normally, the Fund seeks to maintain a dollar-weighted average maturity of between ten and twenty-five years.The Fund’s portfolio management team focuses on credit risk analysis, tax exempt income yield, total return potential, interest rate risk, and call protection in managing its portfolio. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment or shows signs of deteriorating fundamentals, among other reasons. The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Fixed Income Securities Risk: The Fund is subject to the general risks and considerations associated with investing in debt securities, including the risk that issuers will fail to make timely payments of principal or interest or default altogether. Lower-rated securities in which the Fund may invest may be more volatile and may decline more in price in response to negative issuer developments or general economic news due to their increased credit risk relative to other fixed-income investments. In addition, as interest rates rise, the Fund’s investments typically will lose value. Fiscal, economic, monetary, or other governmental policies or measures have in the past—and may in the future—cause or exacerbate interest rate risks. · Municipal Securities Risk: Municipal securities are subject to the same risks affecting fixed income securities in general. In addition, the prices of municipal securities may be adversely affected by legislative or political changes, tax rulings, judicial action, changes in market and economic conditions, and the fiscal condition of the municipal issuer, including an insolvent municipality filing for bankruptcy. The Fund may be more sensitive to these events and conditions if it invests a substantial portion of its assets in the municipal securities of similar projects (such as those relating to education, health care, housing, transportation, and utilities), in particular types of municipal securities (such as general obligation bonds, private activity bonds, and special tax bonds), or in the securities of issuers located within a single state, municipality, territory (such as Puerto Rico), or geographic area. The market for municipal securities generally is less liquid than other securities markets, which may make it more difficult for the Fund to sell its municipal securities. Nongovernmental users of facilities financed by tax-exempt revenue bonds (e.g., companies in the electric utility and health care industries) may have difficulty making payments on their obligations in the event of an economic downturn. This would negatively affect the valuation of municipal securities issued by such facilities. · Below Investment Grade Municipal Bond Risk: Below investment grade municipal bonds typically pay a higher yield than investment grade municipal bonds, but have greater price fluctuations and a higher risk of default than investment grade municipal bonds. The market for below investment grade municipal bonds may be less liquid due to such factors as specific municipal developments, interest rate sensitivity, negative perceptions of the junk bond markets generally, and less secondary market liquidity. This may make such bonds more difficult to sell at an acceptable price, especially during periods of financial distress, increased market volatility, or significant market decline. · Call Risk: A substantial portion of bonds are “callable,” meaning they give the issuer the right to call or redeem the bonds before maturity. Issuers may call outstanding bonds when there is a decline in interest rates, when credit spreads change, or when the issuer’s credit quality improves. As interest rates decline, these bond issuers may pay off their loans early by buying back the bonds, thus depriving the Fund of above market interest rates. · Credit Risk: Municipal bonds are subject to the risk that the issuer or guarantor of a security may not make interest and principal payments as they become due or may default altogether. In addition, if the market perceives a deterioration in the creditworthiness of an issuer, the value and liquidity of bonds issued by that issuer may decline. Credit risk varies based upon the economic and fiscal conditions of each issuer and the municipalities, agencies, instrumentalities, and other issuers within the state, territory, or possession. To the extent that the Fund holds below investment grade securities, these risks may be heightened. Insured municipal bonds have the credit risk of the insurer in addition to the credit risk of the underlying investment being insured. A decline in the credit quality of private activity bonds usually is directly related to a decline in the credit standing of the private user of the facility. · Defaulted Bonds Risk: Defaulted bonds are subject to greater risk of loss of income and principal than securities of issuers whose debt obligations are being met. Defaulted bonds are considered speculative with respect to the issuer’s ability to make interest payments and pay its obligations in full. The repayment of defaulted bonds therefore is subject to significant uncertainties, and in some cases, there may be no recovery of repayment. Defaulted bonds may be repaid only after lengthy workout or bankruptcy proceedings, which typically result in only partial recovery of cash payments or an exchange of the defaulted bond for other securities of the issuer or its affiliates. · Derivatives Risk: The risks associated with derivatives may be different from and greater than the risks associated with directly investing in securities and other investments. Derivatives may increase the Fund’s volatility and reduce its returns. Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful may depend on, among other things, the portfolio managers’ ability to correctly forecast market movements, company and industry valuation levels and trends, changes in foreign exchange and interest rates, and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. Derivatives are also subject to liquidity risk and the risk that the counterparty to a derivative transaction may fail to fulfill its contractual obligations under the derivative contract. In addition, given their complexity, derivatives are subject to the risk that improper or misunderstood documentation may expose the Fund to losses. · Inverse Floater Risk: The Fund’s use of inverse floaters may reduce the Fund’s returns and/or increase the Fund’s volatility. Distributions on inverse floaters are inversely related to short-term municipal bond interest rates. Therefore, distributions paid to the Fund on its inverse floaters will fall when short-term municipal interest rates rise and will rise when short-term municipal interest rates fall. Holders of inverse floaters bear the risk of the fluctuation in value of the issuing trust’s underlying municipal bonds because holders of the floaters have the right to tender their notes back to the trust for payment at par plus accrued interest. This creates effective leverage because the Fund’s net cash investment is significantly less than the value of the underlying bonds. The leverage ratio increases as the value of the inverse floaters becomes a greater proportion of the value of the municipal bonds deposited into the trust. · Distressed Debt Risk: Distressed bonds are speculative and involve substantial risks in addition to the risks of investing in high-yield debt securities. The Fund is subject to an increased risk that it may lose a portion or all of its investment in the distressed debt and may incur higher expenses trying to protect its interests in distressed debt. The prices of distressed bonds are likely to be more sensitive to adverse economic changes or individual issuer developments than the prices of higher rated securities. During an economic downturn or substantial period of rising interest rates, distressed debt issuers may experience financial stress that would adversely affect their ability to service their principal and interest payment obligations. Moreover, it is unlikely that a liquid market will exist for the Fund to sell its holdings in distressed debt securities. · Extension Risk: Rising interest rates may cause an issuer to pay off or retire a debt security later than expected, extending the duration of a bond, making it more sensitive to changes in interest rates reducing the bond’s value. · Governmental Risk: Government actions, including U.S. federal government actions and actions by local, state, and regional governments, could have an adverse effect on municipal bond prices. In addition, the Fund’s performance may be affected by local, state, and regional factors depending on the states or territories in which the Fund’s investments are issued. · Interest Rate Risk: As interest rates rise, prices of bonds (including tax-exempt bonds) generally fall, typically causing the Fund’s investments to lose value. Additionally, rising interest rates or lack of market participants may lead to decreased liquidity in fixed income markets. Interest rate changes generally have a more pronounced effect on the market value of fixed-rate instruments, such as corporate bonds, than they have on floating rate instruments, and typically have a greater effect on the price of fixed income securities with longer durations. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation, and changes in general economic conditions. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. · State and Territory Risk: From time to time, the Fund may be more exposed to risks affecting a particular state, territory (such as Puerto Rico), municipality, or region. As a result, adverse economic, political, and regulatory conditions affecting a single state, territory, municipality, or region (and their political subdivisions, agencies, instrumentalities, and public authorities) can disproportionately affect the Fund’s performance. · Taxability Risk: There is a risk that a bond issued as tax-exempt may be reclassified by the IRS as taxable (for example, if the bond was issued in a transaction deemed by the IRS to be abusive), creating taxable rather than tax- exempt income. In addition, the Fund may invest up to 100% of its net assets in municipal bonds the interest on which may be subject to AMT and invest up to 20% of its net assets in fixed income securities that pay interest that is subject to regular U.S. federal income tax. The income from private activity bonds is an item of tax preference for purposes of AMT, which may cause the income to be taxable to you. Additionally, the Fund’s use of derivatives may increase the amount of distributions taxable to you as ordinary income, increase or decrease the amount of capital gain distributions to you, and/or decrease the amount available for distribution to you as exempt-interest dividends. · Zero Coupon, Deferred Interest, Pay-In-Kind, and Capital Appreciation Bonds Risk: Because these securities bear no interest and compound semiannually at the rate fixed at the time of issuance, their value generally is more volatile than the value of other fixed income securities. Since the bondholders do not receive interest payments, when interest rates rise, these securities fall more dramatically in value than bonds paying interest on a current basis. When interest rates fall, these securities rise more rapidly in value because the bonds reflect a fixed rate of return. If the issuer defaults, the Fund may not receive any return on its investment.An investment in zero coupon and deferred interest securities may cause the Fund to recognize income and make distributions to shareholders before it receives any cash payments on its investment. To generate cash to satisfy distribution requirements, the Fund may have to sell portfolio securities that it otherwise would have continued to hold or to use cash flows from other sources including the sale of Fund shares. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. No performance is shown for Class P shares because the Fund has no Class P shares outstanding. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 4th Q 2023 +7.43% Worst Quarter 1st Q 2022 -8.62% Best Quarter 2023-12-31 0.0743 Worst Quarter 2022-03-31 -0.0862 The table below shows how the Fund’s average annual total returns compare to the returns of securities market indices with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.1The Fund has adopted the Bloomberg U.S. Aggregate Bond Index as its broad-based securities market index. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) -0.0016 0.0020 0.0292 -0.0016 0.0019 0.0289 0.0181 0.0103 0.0314 0.0052 0.0001 0.0251 0.0223 0.0076 0.0325 0.0239 0.0090 0.0324 2017-04-04 0.0233 0.0085 0.0335 Bloomberg High Yield Municipal Bond Index 0.0246 0.0218 0.0435 0.0417 2017-04-04 (reflects no deduction for fees, expenses, or taxes) Bloomberg 65% High Yield Municipal Bond Index/35% Bloomberg Municipal Bond Index 0.0308 0.0171 0.0366 0.0358 2017-04-04 Bloomberg U.S. Aggregate Bond Index 0.0730 -0.0036 0.0201 0.0187 2017-04-04 Short Duration High Income Municipal Bond Fund INVESTMENT OBJECTIVE The investment objective of the Fund is to seek a high level of income exempt from federal income tax. FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 130 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. 100000 Shareholder Fees (Fees paid directly from your investment) 0.0225 0 0 0 0 0 0.0100 0 0 0 Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) 0.0033 0.0033 0.0033 0.0033 0.0033 0.0020 0.0085 0.0010 0 0 0.0013 0.0013 0.0013 0.0008 0.0013 0.0001 0.0001 0.0001 0.0001 0.0001 0.0012 0.0012 0.0012 0.0007 0.0012 0.0066 0.0131 0.0056 0.0041 0.0046 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 291 431 584 1029 291 431 584 1029 233 415 718 1400 133 415 718 1400 57 179 313 701 57 179 313 701 42 132 230 518 42 132 230 518 47 148 258 579 47 148 258 579 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 29% of the average value of its portfolio. 0.29 PRINCIPAL INVESTMENT STRATEGIES Under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds that pay interest exempt from federal income tax. These municipal bonds and other securities in which the Fund may invest may pay interest that is subject to the federal alternative minimum tax (“AMT”) for certain taxpayers. Normally, the Fund seeks to maintain an investment portfolio with a weighted average effective duration of less than 4.5 years.Although the Fund may invest in municipal bonds in any rating category, under normal conditions, the Fund invests at least 50% of its net assets in municipal bonds rated BBB+/Baa1 or lower (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or that are unrated but deemed by Lord, Abbett & Co. LLC (“Lord Abbett”) to be of comparable quality, with a particular emphasis on lower rated municipal bonds (commonly referred to as “below investment grade,” “high yield,” or “junk” bonds), which are bonds that are rated BB+/Ba1 or lower (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality. The Fund may invest without limitation in unrated municipal bonds, which may constitute a significant portion of the Fund’s portfolio. The Fund also may invest in defaulted securities (i.e., bonds on which the issuer has not paid principal or interest on time) and securities of issuers that are or may become involved in reorganizations, financial restructurings, or bankruptcy (commonly referred to as “distressed debt”). The Fund presently does not intend to invest more than 20% of its net assets (measured at the time of investment) in such defaulted or distressed securities. However, the Fund’s defaulted or distressed debt holdings may exceed this level from time to time if the Fund purchased securities that were not considered in default or distressed at their time of purchase and such securities subsequently become defaulted or distressed. These investment strategies are generally higher risk relative to strategies employed by funds that invest primarily in investment grade municipal bonds. The Fund may invest in all types of municipal bonds, including general obligation bonds, revenue bonds, municipal leases, and variable rate demand notes. The Fund may invest in both insured and uninsured municipal bonds. The Fund may invest up to 100% of its net assets in private activity bonds (commonly referred to as “AMT paper”), which are a type of municipal bond that pays interest that is subject to AMT. Although the Fund is permitted to invest up to 20% of its net assets in fixed income securities that pay interest that is subject to regular federal income tax, the Fund presently has no intention of investing in this manner. There is a risk that a bond issued as tax-exempt may be reclassified by the Internal Revenue Service (“IRS”) as taxable. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any ‘‘industry’’ for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region. The Fund may invest up to 100% of its net assets in inverse floaters (also known as “residual interest bonds”), which are a type of derivative investment that provides leveraged exposure to underlying municipal bonds whose interest payments vary inversely with changes in short-term tax-exempt interest rates. The Fund also may invest in other types of derivatives, such as futures, for non-hedging, hedging, or duration management purposes. The Fund may invest in individual securities of any maturity or duration. Because the Fund primarily invests in short duration municipal bonds, it is less sensitive to interest rate changes than a fund that focuses on longer duration bonds. The Fund’s portfolio management team focuses on credit risk analysis, tax exempt income yield, total return potential, interest rate risk, and call protection in managing its portfolio. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment or shows signs of deteriorating fundamentals, among other reasons. The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any ‘‘industry’’ for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Fixed Income Securities Risk: The Fund is subject to the general risks and considerations associated with investing in debt securities, including the risk that issuers will fail to make timely payments of principal or interest or default altogether. Lower-rated securities in which the Fund may invest may be more volatile and may decline more in price in response to negative issuer developments or general economic news due to their increased credit risk relative to other fixed-income investments. In addition, as interest rates rise, the Fund’s investments typically will lose value. Fiscal, economic, monetary, or other governmental policies or measures have in the past—and may in the future—cause or exacerbate interest rate risks. · Municipal Securities Risk: Municipal securities are subject to the same risks affecting fixed income securities in general. In addition, the prices of municipal securities may be adversely affected by legislative or political changes, tax rulings, judicial action, changes in market and economic conditions, and the fiscal condition of the municipal issuer, including an insolvent municipality filing for bankruptcy. The Fund may be more sensitive to these events and conditions if it invests a substantial portion of its assets in the municipal securities of similar projects (such as those relating to education, health care, housing, transportation, and utilities), in particular types of municipal securities (such as general obligation bonds, private activity bonds, and special tax bonds), or in the securities of issuers located within a single state, municipality, territory (such as Puerto Rico), or geographic area. The market for municipal securities generally is less liquid than other securities markets, which may make it more difficult for the Fund to sell its municipal securities. Nongovernmental users of facilities financed by tax-exempt revenue bonds (e.g., companies in the electric utility and health care industries) may have difficulty making payments on their obligations in the event of an economic downturn. This would negatively affect the valuation of municipal securities issued by such facilities. · Below Investment Grade Municipal Bond Risk: Below investment grade municipal bonds typically pay a higher yield than investment grade municipal bonds, but have greater price fluctuations and a higher risk of default than investment grade municipal bonds. The market for below investment grade municipal bonds may be less liquid due to such factors as specific municipal developments, interest rate sensitivity, negative perceptions of the junk bond markets generally, and less secondary market liquidity. This may make such bonds more difficult to sell at an acceptable price, especially during periods of financial distress, increased market volatility, or significant market decline. · Call Risk: A substantial portion of bonds are “callable,” meaning they give the issuer the right to call or redeem the bonds before maturity. Issuers may call outstanding bonds when there is a decline in interest rates, when credit spreads change, or when the issuer’s credit quality improves. As interest rates decline, these bond issuers may pay off their loans early by buying back the bonds, thus depriving the Fund of above market interest rates. · Credit Risk: Municipal bonds are subject to the risk that the issuer or guarantor of a security may not make interest and principal payments as they become due or may default altogether. In addition, if the market perceives a deterioration in the creditworthiness of an issuer, the value and liquidity of bonds issued by that issuer may decline. Credit risk varies based upon the economic and fiscal conditions of each issuer and the municipalities, agencies, instrumentalities, and other issuers within the state, territory, or possession. To the extent that the Fund holds below investment grade securities, these risks may be heightened. Insured municipal bonds have the credit risk of the insurer in addition to the credit risk of the underlying investment being insured. A decline in the credit quality of private activity bonds usually is directly related to a decline in the credit standing of the private user of the facility. · Defaulted Bonds Risk: Defaulted bonds are subject to greater risk of loss of income and principal than securities of issuers whose debt obligations are being met. Defaulted bonds are considered speculative with respect to the issuer’s ability to make interest payments and pay its obligations in full. The repayment of defaulted bonds therefore is subject to significant uncertainties, and in some cases, there may be no recovery of repayment. Defaulted bonds may be repaid only after lengthy workout or bankruptcy proceedings, which typically result in only partial recovery of cash payments or an exchange of the defaulted bond for other securities of the issuer or its affiliates. · Derivatives Risk: The risks associated with derivatives may be different from and greater than the risks associated with directly investing in securities and other investments. Derivatives may increase the Fund’s volatility and reduce its returns. Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful may depend on, among other things, the portfolio managers’ ability to correctly forecast market movements, company and industry valuation levels and trends, changes in foreign exchange and interest rates, and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. Derivatives are also subject to liquidity risk and the risk that the counterparty to a derivative transaction may fail to fulfill its contractual obligations under the derivative contract. In addition, given their complexity, derivatives are subject to the risk that improper or misunderstood documentation may expose the Fund to losses. · Inverse Floater Risk: The Fund’s use of inverse floaters may reduce the Fund’s returns and/or increase the Fund’s volatility. Distributions on inverse floaters are inversely related to short-term municipal bond interest rates. Therefore, distributions paid to the Fund on its inverse floaters will fall when short-term municipal interest rates rise and will rise when short-term municipal interest rates fall. Holders of inverse floaters bear the risk of the fluctuation in value of the issuing trust’s underlying municipal bonds because holders of the floaters have the right to tender their notes back to the trust for payment at par plus accrued interest. This creates effective leverage because the Fund’s net cash investment is significantly less than the value of the underlying bonds. The leverage ratio increases as the value of the inverse floaters becomes a greater proportion of the value of the municipal bonds deposited into the trust. · Distressed Debt Risk: Distressed bonds are speculative and involve substantial risks in addition to the risks of investing in high-yield debt securities. The Fund is subject to an increased risk that it may lose a portion or all of its investment in the distressed debt and may incur higher expenses trying to protect its interests in distressed debt. The prices of distressed bonds are likely to be more sensitive to adverse economic changes or individual issuer developments than the prices of higher rated securities. During an economic downturn or substantial period of rising interest rates, distressed debt issuers may experience financial stress that would adversely affect their ability to service their principal and interest payment obligations. Moreover, it is unlikely that a liquid market will exist for the Fund to sell its holdings in distressed debt securities. · Extension Risk: Rising interest rates may cause an issuer to pay off or retire a debt security later than expected, extending the duration of a bond, making it more sensitive to changes in interest rates reducing the bond’s value. · Governmental Risk: Government actions, including U.S. federal government actions and actions by local, state, and regional governments, could have an adverse effect on municipal bond prices. In addition, the Fund’s performance may be affected by local, state, and regional factors depending on the states or territories in which the Fund’s investments are issued. · Interest Rate Risk: As interest rates rise, prices of bonds (including tax-exempt bonds) generally fall, typically causing the Fund’s investments to lose value. Additionally, rising interest rates or lack of market participants may lead to decreased liquidity in fixed income markets. Interest rate changes generally have a more pronounced effect on the market value of fixed-rate instruments, such as corporate bonds, than they have on floating rate instruments, and typically have a greater effect on the price of fixed income securities with longer durations. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation, and changes in general economic conditions. · Municipal Asset-Backed Securities Risk: A municipal asset-backed security is a type of pass-through instrument structured as a loan or note that pays interest that is eligible for exclusion from federal and state income taxation based upon the income from a collateralized underlying municipal asset or pool of municipal assets. Municipal asset-backed securities bear the risk that the underlying municipal assets will not be paid by issuers or by credit insurers or guarantors of such instruments. Some municipal asset-backed securities are unsecured or secured by lower-rated insurers or guarantors and thus may involve greater risk. Municipal asset-backed securities are subject to interest rate risk, credit risk and market risk. Certain municipal asset-backed securities are particularly susceptible to prepayment and extension risks, because prepayments on the underlying assets tend to increase when interest rates fall and decrease when interest rates rise. When market interest rates increase, refinancings and prepayments slow, which lengthens the effective duration of these securities. As a result, the negative effect of the interest rate increase on the market value of municipal asset-backed securities is usually more pronounced than it is for other types of fixed income securities, potentially increasing the volatility of the Fund. Conversely, when market interest rates decline, while the value of municipal asset-backed securities may increase, the rates of prepayment of the underlying assets tend to increase, which shortens the effective duration of these securities. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. · Short Duration Risk: Although any rise in interest rates is likely to cause the prices of debt obligations to fall, the comparatively short duration of the Fund’s portfolio holdings is intended to mitigate some of this risk. The Fund generally will earn less income and, during periods of declining interest rates, will provide lower total returns to investors than funds with longer durations. · State and Territory Risk: From time to time, the Fund may be more exposed to risks affecting a particular state, territory (such as Puerto Rico), municipality, or region. As a result, adverse economic, political, and regulatory conditions affecting a single state, territory, municipality, or region (and their political subdivisions, agencies, instrumentalities, and public authorities) can disproportionately affect the Fund’s performance. · Taxability Risk: There is a risk that a bond issued as tax-exempt may be reclassified by the IRS as taxable (for example, if the bond was issued in a transaction deemed by the IRS to be abusive), creating taxable rather than tax- exempt income. In addition, the Fund may invest up to 100% of its net assets in municipal bonds the interest on which may be subject to AMT and invest up to 20% of its net assets in fixed income securities that pay interest that is subject to regular U.S. federal income tax. The income from private activity bonds is an item of tax preference for purposes of AMT, which may cause the income to be taxable to you. Additionally, the Fund’s use of derivatives may increase the amount of distributions taxable to you as ordinary income, increase or decrease the amount of capital gain distributions to you, and/or decrease the amount available for distribution to you as exempt-interest dividends. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 4th Q 2023 +3.29% Worst Quarter 1st Q 2022 -6.04% Best Quarter 2023-12-31 0.0329 Worst Quarter 2022-03-31 -0.0604 The table below shows how the Fund’s average annual total returns compare to the returns of securities market indices with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.1The Fund has adopted the Bloomberg U.S. Aggregate Bond Index as its broad-based securities market index. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) 0.0191 0.0106 0.0215 0.0188 0.0104 0.0213 0.0277 0.0152 0.0232 0.0259 0.0086 0.0169 0.0437 0.0162 0.0248 0.0453 0.0179 0.0277 2017-04-04 0.0447 0.0172 0.0258 Bloomberg Municipal Bond 1-8 Year Index 0.0474 0.0126 0.0187 0.0197 2017-04-04 (reflects no deduction for fees, expenses, or taxes) 50% Bloomberg Municipal Bond 1-8 Year Index/50% Bloomberg Municipal High Yield 1-8 Year Index 0.0397 0.0230 0.0262 0.0315 2017-04-04 Bloomberg U.S. Aggregate Bond Index 0.0730 -0.0036 0.0201 0.0187 2017-04-04 California Tax Free Fund INVESTMENT OBJECTIVE The investment objective of the Fund is to seek the maximum amount of interest income exempt from federal income tax as is consistent with reasonable risk. The Fund also seeks as high a level of interest income exempt from California personal income tax as is consistent with reasonable risk. FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 130 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. 100000 Shareholder Fees (Fees paid directly from your investment) 0.0225 0 0 0 0 0 0 0.0100 0 0 0 0 Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) 0.0045 0.0045 0.0045 0.0045 0.0045 0.0045 0.0020 0.0084 0.0010 0 0 0.0045 0.0015 0.0015 0.0015 0.0012 0.0015 0.0015 0.0003 0.0003 0.0003 0.0003 0.0003 0.0003 0.0012 0.0012 0.0012 0.0009 0.0012 0.0012 0.0080 0.0144 0.0070 0.0057 0.0060 0.0105 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 305 475 659 1193 305 475 659 1193 247 456 787 1550 147 456 787 1550 72 224 390 871 72 224 390 871 58 183 318 714 58 183 318 714 61 192 335 750 61 192 335 750 107 334 579 1283 107 334 579 1283 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 40% of the average value of its portfolio. 0.40 PRINCIPAL INVESTMENT STRATEGIES Under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds that pay interest exempt from federal income tax and California personal income tax. If the interest on a municipal bond meets these standards, the Fund will treat the bond as qualifying for purposes of the 80% requirement even if the issuer is located outside of California. As a result, the Fund may invest substantially in municipal bonds issued by or on behalf of issuers located outside of California. The Fund uses the volatility of the Bloomberg Municipal Bond Index as an approximation of reasonable risk.Under normal conditions, the Fund invests in investment grade municipal bonds, which are bonds that are rated BBB/Baa or higher (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord, Abbett & Co. LLC (“Lord Abbett”) to be of comparable quality. The Fund may invest up to 20% of its net assets in lower rated municipal bonds (commonly referred to as “below investment grade,” “high yield,” or “junk” bonds), which are bonds that are rated BB+/Ba1 or lower (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality.The Fund may invest in all types of municipal bonds, including general obligation bonds, revenue bonds, municipal leases, and variable rate demand notes. The Fund may invest in both insured and uninsured municipal bonds. The Fund also may invest in zero coupon, deferred interest, pay-in-kind, and capital appreciation bonds.The Fund may invest up to 20% of its net assets in municipal bonds that pay interest that is subject to the federal alternative minimum tax (“AMT”), including private activity bonds (commonly referred to as “AMT paper”). Although the Fund is permitted to invest up to 20% of its net assets in fixed income securities that pay interest that is subject to federal or California personal income taxes, the Fund presently has no intention of investing in this manner. There is a risk that a bond issued as tax-exempt may be reclassified by the Internal Revenue Service (“IRS”) as taxable. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region.The Fund may invest up to 20% of its net assets in inverse floaters (also known as “residual interest bonds”), which are a type of derivative investment that provides leveraged exposure to underlying municipal bonds whose interest payments vary inversely with changes in short-term tax-exempt interest rates. The Fund also may invest in other types of derivatives, such as futures, for non-hedging, hedging, or duration management purposes.The Fund may invest in individual securities of any maturity or duration. The Fund may invest in money market securities and their equivalents, typically for cash management purposes.The Fund’s portfolio management team focuses on credit risk analysis, tax exempt income yield, total return potential, interest rate risk, and call protection in managing its portfolio. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment or shows signs of deteriorating fundamentals, among other reasons. The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Fixed Income Securities Risk: The Fund is subject to the general risks and considerations associated with investing in debt securities, including the risk that issuers will fail to make timely payments of principal or interest or default altogether. Lower-rated securities in which the Fund may invest may be more volatile and may decline more in price in response to negative issuer developments or general economic news due to their increased credit risk relative to other fixed-income investments. In addition, as interest rates rise, the Fund’s investments typically will lose value. Fiscal, economic, monetary, or other governmental policies or measures have in the past—and may in the future—cause or exacerbate interest rate risks. · Municipal Securities Risk: Municipal securities are subject to the same risks affecting fixed income securities in general. In addition, the prices of municipal securities may be adversely affected by legislative or political changes, tax rulings, judicial action, changes in market and economic conditions, and the fiscal condition of the municipal issuer, including an insolvent municipality filing for bankruptcy. The Fund may be more sensitive to these events and conditions if it invests a substantial portion of its assets in the municipal securities of similar projects (such as those relating to education, health care, housing, transportation, and utilities), in particular types of municipal securities (such as general obligation bonds, private activity bonds, and special tax bonds), or in the securities of issuers located within a single state, municipality, territory (such as Puerto Rico), or geographic area. The market for municipal securities generally is less liquid than other securities markets, which may make it more difficult for the Fund to sell its municipal securities. Nongovernmental users of facilities financed by tax-exempt revenue bonds (e.g., companies in the electric utility and health care industries) may have difficulty making payments on their obligations in the event of an economic downturn. This would negatively affect the valuation of municipal securities issued by such facilities. · Below Investment Grade Municipal Bond Risk: Below investment grade municipal bonds typically pay a higher yield than investment grade municipal bonds, but have greater price fluctuations and a higher risk of default than investment grade municipal bonds. The market for below investment grade municipal bonds may be less liquid due to such factors as specific municipal developments, interest rate sensitivity, negative perceptions of the junk bond markets generally, and less secondary market liquidity. This may make such bonds more difficult to sell at an acceptable price, especially during periods of financial distress, increased market volatility, or significant market decline. · State Specific Risk: Because of the Fund’s geographic focus, the Fund is more exposed to risks affecting California municipal bond issuers than a fund that invests more widely. To the extent that the Fund invests in municipal bonds of issuers located outside California, the Fund may be exposed to risks affecting another state, territory (such as Puerto Rico), or region. · Call Risk: A substantial portion of bonds are “callable,” meaning they give the issuer the right to call or redeem the bonds before maturity. Issuers may call outstanding bonds when there is a decline in interest rates, when credit spreads change, or when the issuer’s credit quality improves. As interest rates decline, these bond issuers may pay off their loans early by buying back the bonds, thus depriving the Fund of above market interest rates. · Credit Risk: Municipal bonds are subject to the risk that the issuer or guarantor of a security may not make interest and principal payments as they become due or may default altogether. In addition, if the market perceives a deterioration in the creditworthiness of an issuer, the value and liquidity of bonds issued by that issuer may decline. Credit risk varies based upon the economic and fiscal conditions of each issuer and the municipalities, agencies, instrumentalities, and other issuers within the state, territory, or possession. To the extent that the Fund holds below investment grade securities, these risks may be heightened. Insured municipal bonds have the credit risk of the insurer in addition to the credit risk of the underlying investment being insured. A decline in the credit quality of private activity bonds usually is directly related to a decline in the credit standing of the private user of the facility. · Inverse Floater Risk: The Fund’s use of inverse floaters may reduce the Fund’s returns and/or increase the Fund’s volatility. Distributions on inverse floaters are inversely related to short-term municipal bond interest rates. Therefore, distributions paid to the Fund on its inverse floaters will fall when short-term municipal interest rates rise and will rise when short-term municipal interest rates fall. Holders of inverse floaters bear the risk of the fluctuation in value of the issuing trust’s underlying municipal bonds because holders of the floaters have the right to tender their notes back to the trust for payment at par plus accrued interest. This creates effective leverage because the Fund’s net cash investment is significantly less than the value of the underlying bonds. The leverage ratio increases as the value of the inverse floaters becomes a greater proportion of the value of the municipal bonds deposited into the trust. · Derivatives Risk: The risks associated with derivatives may be different from and greater than the risks associated with directly investing in securities and other investments. Derivatives may increase the Fund’s volatility and reduce its returns. Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful may depend on, among other things, the portfolio managers’ ability to correctly forecast market movements, company and industry valuation levels and trends, changes in foreign exchange and interest rates, and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. Derivatives are also subject to liquidity risk and the risk that the counterparty to a derivative transaction may fail to fulfill its contractual obligations under the derivative contract. In addition, given their complexity, derivatives are subject to the risk that improper or misunderstood documentation may expose the Fund to losses. · Extension Risk: Rising interest rates may cause an issuer to pay off or retire a debt security later than expected, extending the duration of a bond, making it more sensitive to changes in interest rates reducing the bond’s value. · Governmental Risk: Government actions, including U.S. federal government actions and actions by local, state, and regional governments, could have an adverse effect on municipal bond prices. In addition, the Fund’s performance may be affected by local, state, and regional factors depending on the states or territories in which the Fund’s investments are issued. · Interest Rate Risk: As interest rates rise, prices of bonds (including tax-exempt bonds) generally fall, typically causing the Fund’s investments to lose value. Additionally, rising interest rates or lack of market participants may lead to decreased liquidity in fixed income markets. Interest rate changes generally have a more pronounced effect on the market value of fixed-rate instruments, such as corporate bonds, than they have on floating rate instruments, and typically have a greater effect on the price of fixed income securities with longer durations. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation, and changes in general economic conditions. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. · Taxability Risk: Although the Fund attempts to purchase only bona fide tax-exempt securities (except for its ability to invest up to 20% of its net assets in municipal bonds that pay interest subject to AMT and fixed income securities that pay interest that is subject to regular U.S. federal and state and local income taxes, as applicable), there is a risk that a bond issued as tax-exempt may be reclassified by the IRS as taxable (for example, if the bond was issued in a transaction deemed by the IRS to be abusive), creating taxable rather than tax-exempt income. Additionally, the Fund’s use of derivatives may increase the amount of distributions taxable to you as ordinary income, increase or decrease the amount of capital gain distributions to you, and/or decrease the amount available for distribution to you as exempt-interest dividends. · Zero Coupon, Deferred Interest, Pay-In-Kind, and Capital Appreciation Bonds Risk: Because these securities bear no interest and compound semiannually at the rate fixed at the time of issuance, their value generally is more volatile than the value of other fixed income securities. Since the bondholders do not receive interest payments, when interest rates rise, these securities fall more dramatically in value than bonds paying interest on a current basis. When interest rates fall, these securities rise more rapidly in value because the bonds reflect a fixed rate of return. If the issuer defaults, the Fund may not receive any return on its investment.An investment in zero coupon and deferred interest securities may cause the Fund to recognize income and make distributions to shareholders before it receives any cash payments on its investment. To generate cash to satisfy distribution requirements, the Fund may have to sell portfolio securities that it otherwise would have continued to hold or to use cash flows from other sources including the sale of Fund shares. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. No performance is shown for Class P shares because the Fund has not issued Class P shares. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 4th Q 2023 +8.12% Worst Quarter 1st Q 2022 -8.13% Best Quarter 2023-12-31 0.0812 Worst Quarter 2022-03-31 -0.0813 The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.1The Fund has adopted the Bloomberg U.S. Aggregate Bond Index as its broad-based securities market index. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) 0.0029 -0.0053 0.0181 0.0029 -0.0053 0.0181 0.0157 0.0025 0.0206 0.0092 -0.0069 0.0140 0.0267 0.0003 0.0214 0.0292 0.0016 0.0232 2017-04-04 0.0277 0.0013 0.0224 Bloomberg Municipal Bond Index 0.0425 0.0080 0.0234 0.0246 2017-04-04 (reflects no deduction for fees, expenses, or taxes) Bloomberg U.S. Aggregate Bond Index 0.0730 -0.0036 0.0201 0.0187 2017-04-04 New Jersey Tax Free Fund INVESTMENT OBJECTIVE The investment objective of the Fund is to seek the maximum amount of interest income exempt from federal income tax as is consistent with reasonable risk. The Fund also seeks as high a level of interest income exempt from New Jersey personal income tax as is consistent with reasonable risk. FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 130 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. 100000 Shareholder Fees (Fees paid directly from your investment) 0.0225 0 0 0 0 0 0 0 0 0 Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) 0.0045 0.0045 0.0045 0.0045 0.0045 0.0020 0.0010 0 0 0.0045 0.0018 0.0018 0.0015 0.0018 0.0018 0.0083 0.0073 0.0060 0.0063 0.0108 -0.0001 -0.0001 -0.0001 -0.0001 -0.0001 0.0082 0.0072 0.0059 0.0062 0.0107 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 307 483 674 1226 307 483 674 1226 74 232 405 906 74 232 405 906 60 191 334 749 60 191 334 749 63 201 350 785 63 201 350 785 109 342 595 1316 109 342 595 1316 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 27% of the average value of its portfolio. 0.27 PRINCIPAL INVESTMENT STRATEGIES Under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds that pay interest exempt from federal income tax and New Jersey personal income tax. If the interest on a municipal bond meets these standards, the Fund will treat the bond as qualifying for purposes of the 80% requirement even if the issuer is located outside of New Jersey. As a result, the Fund may invest substantially in municipal bonds issued by or on behalf of issuers located outside of New Jersey. The Fund is nondiversified, which means it may invest a greater portion of its assets in a single issuer than a diversified fund. The Fund uses the volatility of the Bloomberg Municipal Bond Index as an approximation of reasonable risk.Under normal conditions, the Fund invests in investment grade municipal bonds, which are bonds that are rated BBB/Baa or higher (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality. The Fund may invest up to 20% of its net assets in lower rated municipal bonds (commonly referred to as “below investment grade,” “high yield,” or “junk” bonds), which are bonds that are rated BB+/Ba1 or lower (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality.The Fund may invest in all types of municipal bonds, including general obligation bonds, revenue bonds, municipal leases, and variable rate demand notes. The Fund may invest in both insured and uninsured municipal bonds. The Fund also may invest in zero coupon, deferred interest, pay-in-kind, and capital appreciation bonds.The Fund may invest up to 20% of its net assets in municipal bonds that pay interest that is subject to the federal alternative minimum tax (“AMT”), including private activity bonds (commonly referred to as “AMT paper”). Although the Fund is permitted to invest up to 20% of its net assets in fixed income securities that pay interest that is subject to federal or New Jersey personal income taxes, the Fund presently has no intention of investing in this manner. There is a risk that a bond issued as tax-exempt may be reclassified by the Internal Revenue Service (“IRS”) as taxable. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region.The Fund may invest up to 20% of its net assets in inverse floaters (also known as “residual interest bonds”), which are a type of derivative investment that provides leveraged exposure to underlying municipal bonds whose interest payments vary inversely with changes in short-term tax-exempt interest rates. The Fund also may invest in other types of derivatives, such as futures, for non-hedging, hedging, or duration management purposes.The Fund may invest in individual securities of any maturity or duration. The Fund may invest in money market securities and their equivalents, typically for cash management purposes.The Fund’s portfolio management team focuses on credit risk analysis, tax-exempt income yield, total return potential, interest rate risk, and call protection in managing its portfolio. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment or shows signs of deteriorating fundamentals, among other reasons.The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Fixed Income Securities Risk: The Fund is subject to the general risks and considerations associated with investing in debt securities, including the risk that issuers will fail to make timely payments of principal or interest or default altogether. Lower-rated securities in which the Fund may invest may be more volatile and may decline more in price in response to negative issuer developments or general economic news due to their increased credit risk relative to other fixed-income investments. In addition, as interest rates rise, the Fund’s investments typically will lose value. Fiscal, economic, monetary, or other governmental policies or measures have in the past—and may in the future—cause or exacerbate interest rate risks. · Municipal Securities Risk: Municipal securities are subject to the same risks affecting fixed income securities in general. In addition, the prices of municipal securities may be adversely affected by legislative or political changes, tax rulings, judicial action, changes in market and economic conditions, and the fiscal condition of the municipal issuer, including an insolvent municipality filing for bankruptcy. The Fund may be more sensitive to these events and conditions if it invests a substantial portion of its assets in the municipal securities of similar projects (such as those relating to education, health care, housing, transportation, and utilities), in particular types of municipal securities (such as general obligation bonds, private activity bonds, and special tax bonds), or in the securities of issuers located within a single state, municipality, territory (such as Puerto Rico), or geographic area. The market for municipal securities generally is less liquid than other securities markets, which may make it more difficult for the Fund to sell its municipal securities. Nongovernmental users of facilities financed by tax-exempt revenue bonds (e.g., companies in the electric utility and health care industries) may have difficulty making payments on their obligations in the event of an economic downturn. This would negatively affect the valuation of municipal securities issued by such facilities. · Below Investment Grade Municipal Bond Risk: Below investment grade municipal bonds typically pay a higher yield than investment grade municipal bonds, but have greater price fluctuations and a higher risk of default than investment grade municipal bonds. The market for below investment grade municipal bonds may be less liquid due to such factors as specific municipal developments, interest rate sensitivity, negative perceptions of the junk bond markets generally, and less secondary market liquidity. This may make such bonds more difficult to sell at an acceptable price, especially during periods of financial distress, increased market volatility, or significant market decline. · Non-Diversification Risk: The Fund is a non-diversified mutual fund under the Investment Company Act of 1940, as amended (the “1940 Act”). This means that the Fund may invest a greater portion of its assets in, and own a greater amount of the voting securities of, a single issuer or guarantor than a diversified fund. As a result, the value of the Fund’s investments may be more adversely affected by a single economic, political or regulatory event than the value of the investments of a diversified mutual fund. · State Specific Risk: Because of the Fund’s geographic focus, the Fund is more exposed to risks affecting New Jersey municipal bond issuers than a fund that invests more widely. To the extent that the Fund invests in municipal bonds of issuers located outside New Jersey, the Fund may be exposed to risks affecting another state, territory (such as Puerto Rico), or region. · Call Risk: A substantial portion of bonds are “callable,” meaning they give the issuer the right to call or redeem the bonds before maturity. Issuers may call outstanding bonds when there is a decline in interest rates, when credit spreads change, or when the issuer’s credit quality improves. As interest rates decline, these bond issuers may pay off their loans early by buying back the bonds, thus depriving the Fund of above market interest rates. · Credit Risk: Municipal bonds are subject to the risk that the issuer or guarantor of a security may not make interest and principal payments as they become due or may default altogether. In addition, if the market perceives a deterioration in the creditworthiness of an issuer, the value and liquidity of bonds issued by that issuer may decline. Credit risk varies based upon the economic and fiscal conditions of each issuer and the municipalities, agencies, instrumentalities, and other issuers within the state, territory, or possession. To the extent that the Fund holds below investment grade securities, these risks may be heightened. Insured municipal bonds have the credit risk of the insurer in addition to the credit risk of the underlying investment being insured. A decline in the credit quality of private activity bonds usually is directly related to a decline in the credit standing of the private user of the facility. · Inverse Floater Risk: The Fund’s use of inverse floaters may reduce the Fund’s returns and/or increase the Fund’s volatility. Distributions on inverse floaters are inversely related to short-term municipal bond interest rates. Therefore, distributions paid to the Fund on its inverse floaters will fall when short-term municipal interest rates rise and will rise when short-term municipal interest rates fall. Holders of inverse floaters bear the risk of the fluctuation in value of the issuing trust’s underlying municipal bonds because holders of the floaters have the right to tender their notes back to the trust for payment at par plus accrued interest. This creates effective leverage because the Fund’s net cash investment is significantly less than the value of the underlying bonds. The leverage ratio increases as the value of the inverse floaters becomes a greater proportion of the value of the municipal bonds deposited into the trust. · Derivatives Risk: The risks associated with derivatives may be different from and greater than the risks associated with directly investing in securities and other investments. Derivatives may increase the Fund’s volatility and reduce its returns. Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful may depend on, among other things, the portfolio managers’ ability to correctly forecast market movements, company and industry valuation levels and trends, changes in foreign exchange and interest rates, and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. Derivatives are also subject to liquidity risk and the risk that the counterparty to a derivative transaction may fail to fulfill its contractual obligations under the derivative contract. In addition, given their complexity, derivatives are subject to the risk that improper or misunderstood documentation may expose the Fund to losses. · Extension Risk: Rising interest rates may cause an issuer to pay off or retire a debt security later than expected, extending the duration of a bond, making it more sensitive to changes in interest rates reducing the bond’s value. · Governmental Risk: Government actions, including U.S. federal government actions and actions by local, state, and regional governments, could have an adverse effect on municipal bond prices. In addition, the Fund’s performance may be affected by local, state, and regional factors depending on the states or territories in which the Fund’s investments are issued. · Interest Rate Risk: As interest rates rise, prices of bonds (including tax-exempt bonds) generally fall, typically causing the Fund’s investments to lose value. Additionally, rising interest rates or lack of market participants may lead to decreased liquidity in fixed income markets. Interest rate changes generally have a more pronounced effect on the market value of fixed-rate instruments, such as corporate bonds, than they have on floating rate instruments, and typically have a greater effect on the price of fixed income securities with longer durations. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation, and changes in general economic conditions. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. · Taxability Risk: Although the Fund attempts to purchase only bona fide tax-exempt securities (except for its ability to invest up to 20% of its net assets in municipal bonds that pay interest subject to AMT and fixed income securities that pay interest that is subject to regular U.S. federal and state and local income taxes, as applicable), there is a risk that a bond issued as tax-exempt may be reclassified by the IRS as taxable (for example, if the bond was issued in a transaction deemed by the IRS to be abusive), creating taxable rather than tax-exempt income. Additionally, the Fund’s use of derivatives may increase the amount of distributions taxable to you as ordinary income, increase or decrease the amount of capital gain distributions to you, and/or decrease the amount available for distribution to you as exempt-interest dividends. · Zero Coupon, Deferred Interest, Pay-In-Kind, and Capital Appreciation Bonds Risk: Because these securities bear no interest and compound semiannually at the rate fixed at the time of issuance, their value generally is more volatile than the value of other fixed income securities. Since the bondholders do not receive interest payments, when interest rates rise, these securities fall more dramatically in value than bonds paying interest on a current basis. When interest rates fall, these securities rise more rapidly in value because the bonds reflect a fixed rate of return. If the issuer defaults, the Fund may not receive any return on its investment.An investment in zero coupon and deferred interest securities may cause the Fund to recognize income and make distributions to shareholders before it receives any cash payments on its investment. To generate cash to satisfy distribution requirements, the Fund may have to sell portfolio securities that it otherwise would have continued to hold or to use cash flows from other sources including the sale of Fund shares. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. No performance is shown for Class P shares because the Fund has not issued Class P shares. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 4th Q 2023 +7.98% Worst Quarter 1st Q 2022 -6.92% Best Quarter 2023-12-31 0.0798 Worst Quarter 2022-03-31 -0.0692 The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.1The Fund has adopted the Bloomberg U.S. Aggregate Bond Index as its broad-based securities market index. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) 0.0051 -0.0006 0.0211 0.0051 -0.0006 0.0211 0.0159 0.0058 0.0226 0.0317 0.0053 0.0244 0.0309 0.0063 0.0263 2017-04-04 0.0306 0.0060 0.0254 Bloomberg Municipal Bond Index 0.0425 0.0080 0.0234 0.0246 2017-04-04 (reflects no deduction for fees, expenses, or taxes) Bloomberg U.S. Aggregate Bond Index 0.0730 -0.0036 0.0201 0.0187 2017-04-04 New York Tax Free Fund INVESTMENT OBJECTIVE The investment objective of the Fund is to seek the maximum amount of interest income exempt from federal income tax as is consistent with reasonable risk. The Fund also seeks as high a level of interest income exempt from the personal income tax of New York State as is consistent with reasonable risk. The Fund also seeks as high a level of interest income exempt from New York City personal income tax as is consistent with reasonable risk. FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 130 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. 100000 Shareholder Fees (Fees paid directly from your investment) 0.0225 0 0 0 0 0 0 0.0100 0 0 0 0 Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) 0.0045 0.0045 0.0045 0.0045 0.0045 0.0045 0.0020 0.0084 0.0010 0 0 0.0045 0.0016 0.0016 0.0016 0.0013 0.0016 0.0016 0.0003 0.0003 0.0003 0.0003 0.0003 0.0003 0.0013 0.0013 0.0013 0.0010 0.0013 0.0013 0.0081 0.0145 0.0071 0.0058 0.0061 0.0106 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 306 478 665 1204 306 478 665 1204 248 459 792 1561 148 459 792 1561 73 227 395 883 73 227 395 883 59 186 324 726 59 186 324 726 62 195 340 762 62 195 340 762 108 337 585 1294 108 337 585 1294 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 29% of the average value of its portfolio. 0.29 PRINCIPAL INVESTMENT STRATEGIES Under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds that pay interest exempt from federal, New York State, and New York City personal income tax. If the interest on a municipal bond meets these standards, the Fund will treat the bond as qualifying for purposes of the 80% requirement even if the issuer is located outside of New York State or New York City. As a result, the Fund may invest substantially in municipal bonds issued by or on behalf of issuers located outside of New York State. The Fund is nondiversified, which means it may invest a greater portion of its assets in a single issuer than a diversified fund. The Fund uses the volatility of the Bloomberg Municipal Bond Index as an approximation of reasonable risk.Under normal conditions, the Fund invests in investment grade municipal bonds, which are bonds that are rated BBB/Baa or higher (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord, Abbett & Co. LLC (“Lord Abbett”) to be of comparable quality. The Fund may invest up to 20% of its net assets in lower rated municipal bonds (commonly referred to as “below investment grade,” “high yield,” or “junk” bonds), which are bonds that are rated BB+/Ba1 or lower (at the time of purchase), or an equivalent short-term rating, as applicable, by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality.The Fund may invest in all types of municipal bonds, including general obligation bonds, revenue bonds, municipal leases, and variable rate demand notes. The Fund may invest in both insured and uninsured municipal bonds. The Fund also may invest in zero coupon, deferred interest, pay-in-kind, and capital appreciation bonds.The Fund may invest up to 20% of its net assets in municipal bonds that pay interest that is subject to the federal alternative minimum tax (“AMT”), including private activity bonds (commonly referred to as “AMT paper”). Although the Fund is permitted to invest up to 20% of its net assets in fixed income securities that pay interest that is subject to federal, New York State, or New York City personal income taxes, the Fund presently has no intention of investing in this manner. There is a risk that a bond issued as tax-exempt may be reclassified by the Internal Revenue Service (“IRS”) as taxable. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region.The Fund may invest up to 20% of its net assets in inverse floaters (also known as “residual interest bonds”), which are a type of derivative investment that provides leveraged exposure to underlying municipal bonds whose interest payments vary inversely with changes in short-term tax-exempt interest rates. The Fund also may invest in other types of derivatives, such as futures, for non-hedging, hedging, or duration management purposes.The Fund may invest in individual securities of any maturity or duration. The Fund may invest in money market securities and their equivalents, typically for cash management purposes.The Fund’s portfolio management team focuses on credit risk analysis, tax-exempt income yield, total return potential, interest rate risk, and call protection in managing its portfolio. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment or shows signs of deteriorating fundamentals, among other reasons.The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Fixed Income Securities Risk: The Fund is subject to the general risks and considerations associated with investing in debt securities, including the risk that issuers will fail to make timely payments of principal or interest or default altogether. Lower-rated securities in which the Fund may invest may be more volatile and may decline more in price in response to negative issuer developments or general economic news due to their increased credit risk relative to other fixed-income investments. In addition, as interest rates rise, the Fund’s investments typically will lose value. Fiscal, economic, monetary, or other governmental policies or measures have in the past—and may in the future—cause or exacerbate interest rate risks. · Municipal Securities Risk: Municipal securities are subject to the same risks affecting fixed income securities in general. In addition, the prices of municipal securities may be adversely affected by legislative or political changes, tax rulings, judicial action, changes in market and economic conditions, and the fiscal condition of the municipal issuer, including an insolvent municipality filing for bankruptcy. The Fund may be more sensitive to these events and conditions if it invests a substantial portion of its assets in the municipal securities of similar projects (such as those relating to education, health care, housing, transportation, and utilities), in particular types of municipal securities (such as general obligation bonds, private activity bonds, and special tax bonds), or in the securities of issuers located within a single state, municipality, territory (such as Puerto Rico), or geographic area. The market for municipal securities generally is less liquid than other securities markets, which may make it more difficult for the Fund to sell its municipal securities. Nongovernmental users of facilities financed by tax-exempt revenue bonds (e.g., companies in the electric utility and health care industries) may have difficulty making payments on their obligations in the event of an economic downturn. This would negatively affect the valuation of municipal securities issued by such facilities. · Below Investment Grade Municipal Bond Risk: Below investment grade municipal bonds typically pay a higher yield than investment grade municipal bonds, but have greater price fluctuations and a higher risk of default than investment grade municipal bonds. The market for below investment grade municipal bonds may be less liquid due to such factors as specific municipal developments, interest rate sensitivity, negative perceptions of the junk bond markets generally, and less secondary market liquidity. This may make such bonds more difficult to sell at an acceptable price, especially during periods of financial distress, increased market volatility, or significant market decline. · Non-Diversification Risk: The Fund is a non-diversified mutual fund under the Investment Company Act of 1940, as amended (the "1940 Act"). This means that the Fund may invest a greater portion of its assets in, and own a greater amount of the voting securities of, a single issuer or guarantor than a diversified fund. As a result, the value of the Fund’s investments may be more adversely affected by a single economic, political or regulatory event than the value of the investments of a diversified mutual fund. · State Specific Risk: Because of the Fund’s geographic focus, the Fund is more exposed to risks affecting New York State and New York City municipal bond issuers than a fund that invests more widely. To the extent that the Fund invests in municipal bonds of issuers located outside New York State and New York City, the Fund may be exposed to risks affecting another state, city, territory (such as Puerto Rico), or region. · Call Risk: A substantial portion of bonds are “callable,” meaning they give the issuer the right to call or redeem the bonds before maturity. Issuers may call outstanding bonds when there is a decline in interest rates, when credit spreads change, or when the issuer’s credit quality improves. As interest rates decline, these bond issuers may pay off their loans early by buying back the bonds, thus depriving the Fund of above market interest rates. · Credit Risk: Municipal bonds are subject to the risk that the issuer or guarantor of a security may not make interest and principal payments as they become due or may default altogether. In addition, if the market perceives a deterioration in the creditworthiness of an issuer, the value and liquidity of bonds issued by that issuer may decline. Credit risk varies based upon the economic and fiscal conditions of each issuer and the municipalities, agencies, instrumentalities, and other issuers within the state, territory, or possession. To the extent that the Fund holds below investment grade securities, these risks may be heightened. Insured municipal bonds have the credit risk of the insurer in addition to the credit risk of the underlying investment being insured. A decline in the credit quality of private activity bonds usually is directly related to a decline in the credit standing of the private user of the facility. · Inverse Floater Risk: The Fund’s use of inverse floaters may reduce the Fund’s returns and/or increase the Fund’s volatility. Distributions on inverse floaters are inversely related to short-term municipal bond interest rates. Therefore, distributions paid to the Fund on its inverse floaters will fall when short-term municipal interest rates rise and will rise when short-term municipal interest rates fall. Holders of inverse floaters bear the risk of the fluctuation in value of the issuing trust’s underlying municipal bonds because holders of the floaters have the right to tender their notes back to the trust for payment at par plus accrued interest. This creates effective leverage because the Fund’s net cash investment is significantly less than the value of the underlying bonds. The leverage ratio increases as the value of the inverse floaters becomes a greater proportion of the value of the municipal bonds deposited into the trust. · Derivatives Risk: The risks associated with derivatives may be different from and greater than the risks associated with directly investing in securities and other investments. Derivatives may increase the Fund’s volatility and reduce its returns. Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful may depend on, among other things, the portfolio managers’ ability to correctly forecast market movements, company and industry valuation levels and trends, changes in foreign exchange and interest rates, and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. Derivatives are also subject to liquidity risk and the risk that the counterparty to a derivative transaction may fail to fulfill its contractual obligations under the derivative contract. In addition, given their complexity, derivatives are subject to the risk that improper or misunderstood documentation may expose the Fund to losses. · Extension Risk: Rising interest rates may cause an issuer to pay off or retire a debt security later than expected, extending the duration of a bond, making it more sensitive to changes in interest rates reducing the bond’s value. · Governmental Risk: Government actions, including U.S. federal government actions and actions by local, state, and regional governments, could have an adverse effect on municipal bond prices. In addition, the Fund’s performance may be affected by local, state, and regional factors depending on the states or territories in which the Fund’s investments are issued. · Interest Rate Risk: As interest rates rise, prices of bonds (including tax-exempt bonds) generally fall, typically causing the Fund’s investments to lose value. Additionally, rising interest rates or lack of market participants may lead to decreased liquidity in fixed income markets. Interest rate changes generally have a more pronounced effect on the market value of fixed-rate instruments, such as corporate bonds, than they have on floating rate instruments, and typically have a greater effect on the price of fixed income securities with longer durations. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation, and changes in general economic conditions. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. · Taxability Risk: Although the Fund attempts to purchase only bona fide tax-exempt securities (except for its ability to invest up to 20% of its net assets in municipal bonds that pay interest subject to AMT and fixed income securities that pay interest that is subject to regular U.S. federal and state and local income taxes, as applicable), there is a risk that a bond issued as tax-exempt may be reclassified by the IRS as taxable (for example, if the bond was issued in a transaction deemed by the IRS to be abusive), creating taxable rather than tax-exempt income. Additionally, the Fund’s use of derivatives may increase the amount of distributions taxable to you as ordinary income, increase or decrease the amount of capital gain distributions to you, and/or decrease the amount available for distribution to you as exempt-interest dividends. · Zero Coupon, Deferred Interest, Pay-In-Kind, and Capital Appreciation Bonds Risk: Because these securities bear no interest and compound semiannually at the rate fixed at the time of issuance, their value generally is more volatile than the value of other fixed income securities. Since the bondholders do not receive interest payments, when interest rates rise, these securities fall more dramatically in value than bonds paying interest on a current basis. When interest rates fall, these securities rise more rapidly in value because the bonds reflect a fixed rate of return. If the issuer defaults, the Fund may not receive any return on its investment.An investment in zero coupon and deferred interest securities may cause the Fund to recognize income and make distributions to shareholders before it receives any cash payments on its investment. To generate cash to satisfy distribution requirements, the Fund may have to sell portfolio securities that it otherwise would have continued to hold or to use cash flows from other sources including the sale of Fund shares. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. No performance is shown for Class P shares because the Fund has not issued Class P shares. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 4th Q 2023 +8.66% Worst Quarter 1st Q 2022 -7.72% Best Quarter 2023-12-31 0.0866 Worst Quarter 2022-03-31 -0.0772 The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.1The Fund has adopted the Bloomberg U.S. Aggregate Bond Index as its broad-based securities market index. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) -0.0006 -0.0025 0.0173 -0.0006 -0.0025 0.0173 0.0135 0.0045 0.0194 0.0065 -0.0041 0.0133 0.0230 0.0031 0.0206 0.0254 0.0045 0.0223 2017-04-04 0.0250 0.0041 0.0217 Bloomberg Municipal Bond Index 0.0425 0.0080 0.0234 0.0246 2017-04-04 (reflects no deduction for fees, expenses, or taxes) Bloomberg U.S. Aggregate Bond Index 0.0730 -0.0036 0.0201 0.0187 2017-04-04 485BPOS 2025-09-30 0000737800 false 2026-01-28 2026-02-01 N-1A ~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000737800_S000031147Summary1Member row dei_LegalEntityAxis compact cik0000737800_S000031147Member ~ ~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000737800_S000031147Summary1Member row dei_LegalEntityAxis compact cik0000737800_S000031147Member ~ ~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact 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dei_DocumentInformationDocumentAxis compact cik0000737800_S000007539Summary8Member row dei_LegalEntityAxis compact cik0000737800_S000007539Member ~ ~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000737800_S000007539Summary8Member row dei_LegalEntityAxis compact cik0000737800_S000007539Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~ LORD ABBETT MUNICIPAL INCOME FUND INC -0.0066 0.0164 0.011 0.0406 0.0203 0.0029 -0.0418 0.0319 0.029 0.0361 -0.0064 0.0508 0.0113 0.0761 0.0415 0.0208 -0.1011 0.0615 0.0239 0.0461 0.0036 0.0707 0.0072 0.0938 0.048 0.0363 -0.1393 0.0747 0.0294 0.0247 0.0268 0.0738 0.0379 0.1148 0.0349 0.0639 -0.1653 0.0725 0.0622 0.0213 -0.002 0.053 0.021 0.0705 0.0215 0.0408 -0.0929 0.0419 0.0515 0.0427 0.0015 0.0671 0.005 0.093 0.0464 0.0265 -0.1333 0.0694 0.0212 0.0257 0.0105 0.0605 0.0177 0.0828 0.0463 0.0333 -0.1247 0.0771 0.0177 0.0285 0.0054 0.0468 0.0098 0.0819 0.0454 0.0342 -0.1324 0.0817 0.0186 0.022 January 31, 2027 January 31, 2027 January 31, 2027 January 31, 2027 January 31, 2027 These amounts have been updated from fiscal year amounts to reflect current fees and expenses. These amounts have been updated from fiscal year amounts to reflect current fees and expenses. These amounts have been updated from fiscal year amounts to reflect current fees and expenses. These amounts have been updated from fiscal year amounts to reflect current fees and expenses. These amounts have been updated from fiscal year amounts to reflect current fees and expenses. January 31, 2027 January 31, 2027 January 31, 2027 January 31, 2027 January 31, 2027 ~ http://www.lordabbett.com/20250930/role/RRRiskTable3 ~ ~ http://www.lordabbett.com/20250930/role/RRRiskTable5 ~ ~ http://www.lordabbett.com/20250930/role/RRRiskTable7 ~ ~ http://www.lordabbett.com/20250930/role/RRRiskTable9 ~ ~ http://www.lordabbett.com/20250930/role/RRRiskTable11 ~ ~ http://www.lordabbett.com/20250930/role/RRRiskTable13 ~ ~ http://www.lordabbett.com/20250930/role/RRRiskTable15 ~ ~ http://www.lordabbett.com/20250930/role/RRRiskTable17 ~ A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the 18-month anniversary of the purchase falls. A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase. The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate. For the period from February 1, 2026 through January 31, 2027, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses, excluding any applicable 12b-1 fees, acquired fund fees and expenses, interest-related expenses, taxes, expenses related to litigation and potential litigation, and extraordinary expenses, to an annual rate of 0.41% for Class F3 and to an annual rate of 0.45% for each other class. This agreement may be terminated only by the Fund’s Board of Directors. Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares. A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the 18-month anniversary of the purchase falls. A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase. The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate. Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares. A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the 18-month anniversary of the purchase falls. A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase. The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate. Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares. A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the 18-month anniversary of the purchase falls. A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase. The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate. Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares. A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the 18-month anniversary of the purchase falls. A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase. The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate. These amounts have been updated from fiscal year amounts to reflect current fees and expenses. Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares. A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the 18-month anniversary of the purchase falls. A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase. The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate. Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares. A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the 18-month anniversary of the purchase falls. For the period from February 1, 2026 through January 31, 2027, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses, excluding any applicable 12b-1 fees, acquired fund fees and expenses, interest-related expenses, taxes, expenses related to litigation and potential litigation, and extraordinary expenses, to an annual rate of 0.59% for Class F3 and to an annual rate of 0.62% for each other class. This agreement may be terminated only by the Fund’s Board of Directors. A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the 18-month anniversary of the purchase falls. A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase. The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate. Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares.