Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in a diversified portfolio of municipal obligations, the interest on which is exempt from regular federal income tax (the “80% Policy”). In seeking the Fund’s investment objective, the portfolio managers emphasize tax-exempt income. The Fund normally invests in municipal obligations rated in the three highest rating categories (those rated A or higher by S&P Global Ratings (“S&P”), Fitch Ratings (“Fitch”) or Moody’s Investors Service, Inc. (“Moody’s”)) or, if unrated, determined by the investment adviser or sub-adviser to be of comparable quality at the time of purchase. The Fund may invest up to 15% of its net assets in municipal obligations rated BBB by S&P, Fitch or Moody’s or, if unrated, determined by the investment adviser or sub-adviser to be of comparable quality. The Fund will not invest more than 50% of its net assets in municipal obligations rated A at the time of purchase by S&P, Fitch or Moody’s or, if unrated, determined by the investment adviser or sub-adviser to be of comparable quality. For purposes of rating restrictions, if securities are rated differently by two or more rating agencies, the highest rating is used. The Fund may continue to hold securities that are downgraded (including bonds downgraded to below investment grade credit quality (“junk bonds”)) if the sub-adviser believes it would be advantageous to do so. The Fund will not invest in a municipal obligation the interest on which the Fund’s sub-adviser believes is subject to the federal alternative minimum tax.

With respect to its investment in municipal obligations, the Fund invests primarily in general obligation or revenue bonds.  The Fund currently targets an average portfolio duration of approximately 2 - 4.5 years and an average weighted portfolio maturity of approximately 3 - 6 years, but may invest in securities of any maturity or duration, and may in the future alter its maturity or duration target range.  The Fund may use various techniques to shorten or lengthen its dollar-weighted average portfolio duration, including the acquisition of municipal obligations at a premium or discount.  The portfolio managers generally will seek to enhance after-tax total return by actively engaging in relative value trading within the portfolio to take advantage of price opportunities in the markets for municipal obligations and use relative value analysis to assist them in making decisions to purchase or sell investments.  With respect to 20% of its net assets, the Fund may invest in municipal obligations that are not exempt from regular federal income tax, direct obligations of the U.S. Treasury and/or obligations of U.S. Government agencies, instrumentalities and government-sponsored enterprises.  The Fund may hold cash and may invest in cash equivalents and money market instruments.

The sub-adviser’s process for selecting municipal obligations for purchase and sale generally includes consideration of the creditworthiness of the issuer or person obligated to repay the obligation.  In evaluating creditworthiness, the sub-adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio managers may also trade securities to minimize taxable capital gains to shareholders.  The portfolio managers may sell a security when its credit quality declines, when the remaining maturity of a fixed-income security reaches a certain point or to pursue more attractive investment options.

These returns reflect the maximum current sales charge for Class A (3.25%) and any applicable contingent deferred sales charge (“CDSC”) for Class C. Effective November 5, 2020, Class C shares automatically convert to Class A shares eight years after purchase.  The average annual total returns listed for Class C reflect conversion to Class A shares after eight years.  Prior to November 5, 2020, Class C shares automatically converted to Class A shares ten years after purchase. Investors cannot invest directly in an Index.

BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively Bloomberg“). BARCLAYS® is a trademark and service mark of Barclays Bank Plc (collectively with its affiliates, ”Barclays“), used under license. Bloomberg or Bloomberg’s licensors, including Barclays, own all proprietary rights in the Bloomberg Barclays Indices. Neither Bloomberg nor Barclays is affiliated with Eaton Vance, and neither approves, endorses, reviews or recommends the Fund. Neither Bloomberg nor Barclays guarantees the timeliness, accurateness or completeness of any data or information relating to Bloomberg Municipal Bond Index, Bloomberg Municipal Managed Money 1-7 Year Bond Index, and Bloomberg 5 Year Municipal Bond Index, and neither shall be liable in any way to Eaton Vance, investors in the Fund or other third parties in respect of the use or accuracy of Bloomberg Municipal Bond Index, Bloomberg Municipal Managed Money 1-7 Year Bond Index, and Bloomberg 5 Year Municipal Bond Index or any data included therein.

After-tax returns are calculated using the highest historical individual U.S. federal income tax rates and does not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.   After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.   After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.    Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Market Risk.  The value of investments held by the Fund may increase or decrease in response to social, economic, political, financial, public health crises or other disruptive events (whether real, expected or perceived) in the U.S. and global markets and include events such as war, natural disasters, epidemics and pandemics, terrorism, conflicts and social unrest. These events may negatively impact broad segments of businesses and populations and may exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted. Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions.  Monetary and/or fiscal actions taken by U.S. or foreign governments to stimulate or stabilize the global economy may not be effective and could lead to high market volatility. No active trading market may exist for certain investments held by the Fund, which may impair the ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such assets.

Municipal Obligations Risk. Because the Fund may invest in municipal obligations, the Fund may be susceptible to political, legislative, economic, regulatory, tax or other factors affecting issuers of these municipal obligations, such as state and local governments and their agencies. To the extent that the Fund invests in municipal obligations of issuers in the same state, U.S. territory, or economic sector, it could be more sensitive to economic, business or political developments that affect such state or sector. Municipal obligations and their issuers may be more susceptible to downgrade, loss of revenue, default and bankruptcy during periods of economic stress.  The amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment adviser and sub-adviser than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less well-developed and less liquid than many other securities markets, which may limit the Fund’s ability to sell its municipal obligations at attractive prices. The differences between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress. Less liquid obligations can become more difficult to value and be subject to erratic price movements.

Interest Rate Risk. In general, the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase when interest rates fall and decline when interest rates rise.  Duration measures the time-weighted expected cash flows of a fixed-income security, while maturity refers to the amount of time until a fixed-income security matures.  Generally, securities with longer durations or maturities are more sensitive to changes in interest rates than securities with shorter durations or maturities, causing them to be more volatile.  Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may provide lower returns than fixed-income securities with longer durations or maturities.  The Fund may own individual investments that have longer durations than the Fund's target average portfolio duration. In a rising interest rate environment, the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate.  

Credit Risk. Investments in municipal obligations and other debt obligations (referred to below as “debt instruments”) are subject to the risk of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because of concerns about the issuer’s ability to make principal and interest payments. In addition, the credit ratings of debt instruments may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates.  In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal or similar counsel, which may increase the Fund’s operating expenses and adversely affect net asset value.  Municipal obligations may be insured as to principal and interest payments. If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.

Risks of Principal Only Investments. Principal only investments entitle the Fund to receive the stated value of such investment when held to maturity. The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than obligations that pay interest currently. The Fund will accrue income on these investments and distribute that income each year. The Fund may be required to sell other investments to obtain cash needed for such income distributions.

U.S. Government Securities Risk. Different types of U.S. government securities are subject to different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. Although certain U.S. Government-sponsored agencies (such as the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association) may be chartered or sponsored by acts of Congress, their securities are neither issued nor guaranteed by the U.S. Treasury.  With respect to U.S. government securities that are not backed by the full faith and credit of the United States, there is a risk that the U.S. Government will not provide financial support to such U.S. government agencies, instrumentalities or sponsored enterprises if not obligated to do so by law. U.S. Treasury and U.S. Government agency securities generally have a lower return than other obligations because of their higher credit quality and market liquidity.  

Tax Risk. Income from tax-exempt municipal obligations could be declared taxable because of changes in tax laws, adverse interpretations by the relevant taxing authority or the non-compliant conduct of the issuer of an obligation.

Liquidity Risk.  The Fund is exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions, or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices.  Consequently, the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments to raise cash or abandon an investment opportunity, any of which could have a negative effect on the Fund’s performance. These effects may be exacerbated during times of financial or political stress.

Money Market Instrument Risk. Money market instruments may be adversely affected by market and economic events, such as a sharp rise in prevailing short-term interest rates; adverse developments in the banking industry, which issues or guarantees many money market instruments; adverse economic, political or other developments affecting issuers of money market instruments; changes in the credit quality of issuers; and default by a counterparty.

Tax-Sensitive Investing Risk. The Fund may hold a security in order to achieve more favorable tax-treatment or sell a security in order to create tax losses. The Fund’s utilization of various tax-management techniques may be curtailed or eliminated by tax legislation, regulation or interpretations.  The Fund may not be able to minimize taxable distributions to shareholders and a portion of the Fund’s distributions may be taxable.

Lower Rated Investments Risk.  Investments rated below investment grade and comparable unrated investments (sometimes referred to as “junk”) are speculative because of increased credit risk relative to other fixed income investments. Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Portfolio Turnover Risk. The annual portfolio turnover rate of the Fund may exceed 100%.  A  mutual fund with a high turnover rate (100% or more) may generate more capital gains and may involve greater expenses (which may reduce return) than a fund with a lower rate.  Capital gains distributions will be made to  shareholders if offsetting capital loss carry forwards do not exist.

Risks Associated with Active Management.  The success of the Fund’s investment strategy depends on portfolio management’s successful application of analytical skills and investment judgment.  Active management involves subjective decisions and there is no guarantee that such decisions will produce the desired results or expected returns.

Focused Investment Risk.  To the extent the Fund has substantial investments in a relatively small number of securities or issuers, or a particular market, industry, group of industries, country, region, group of countries, asset class or sector, the Fund’s performance will be more susceptible to any single economic, market, political, or regulatory occurrence affecting those particular securities or issuers or that particular market, industry, group of industries, country, region, group of countries, assets class, or sector than a fund that invests more broadly.

General Fund Investing Risks. The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective.  It is possible to lose money by investing in the Fund.  The Fund is designed to be a long-term investment vehicle and is not suited for short-term trading.  Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective(s).  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.  The Fund relies on various service providers, including the investment adviser and sub-adviser, if applicable, in its operations and is susceptible to operational, information security and related events (such as public health crises, cyber or hacking attacks) that may affect the service providers or the services that they provide to the Fund.  An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of one or more indexes intended to measure broad market performance. The Fund’s primary benchmark index was changed from the Bloomberg Municipal Managed Money Intermediate (1-17 Year) Bond Index to the Bloomberg Municipal Bond Index effective May 1, 2024 to comply with the regulation that requires the Fund’s primary benchmark to represent the overall applicable market. The additional indexes provide a means to compare the Fund’s average annual returns to benchmarks that the investment adviser believes are representative of the Fund’s investment universe. The returns in the bar chart are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower. Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated Fund performance information can be obtained by visiting www.eatonvance.com.

The Fund’s performance reflects the effects of expense reductions.  Absent these reductions, performance would have been lower.  Effective February 17, 2015, the Fund changed its name, objective and investment strategy to invest at least 80% of its net assets in a diversified portfolio of municipal obligations, the interest on which is exempt from regular federal income tax.  The Fund may not have achieved the performance results shown for the period prior to February 17, 2015 under its current investment objective and strategy.

For the ten years ended December 31, 2024, the highest quarterly total return for Class A was 9.10% for the quarter ended December 31, 2023, and the lowest quarterly return  was -5.96% for the quarter ended March 31, 2022.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2024 to March 31, 2025) was 0.11%.

The Fund's investment objective is to provide current income exempt from regular federal income tax.

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. Investors may also pay commissions or other fees to their financial intermediary, which are not reflected below. You may qualify for a reduced sales charge on purchases of Class A shares if you invest, or agree to invest over a 13-month period, at least $100,000 in Eaton Vance Funds. Certain financial intermediaries also may offer variations in Fund sales charges to their customers as described in Appendix A – Financial Intermediary Sales Charge Variations in this Prospectus. More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 27 of this Prospectus and page 22 of the Fund’s Statement of Additional Information.

Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal obligations with final maturities of between one and ten years, the interest on which is exempt from regular federal income tax (the “80% Policy”). For the purposes of the Fund’s 80% Policy, final maturity is defined as (i) the stated final maturity of a callable bond; (ii) the pre-refunded date of an existing pre-refunded bond; (iii) the earliest put date of a put bond; or (iv) the monthly re-set date of a municipal floating-rate bond or obligation. For municipal obligations held by the Fund that become pre-refunded after the Fund purchases such obligation, the final maturity of such obligation remains the stated maturity. All municipal obligations maturing within a calendar year will be defined as having the same final maturity. At least 90% of the Fund’s net assets normally is invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser or sub-adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser or sub-adviser (“junk bonds”). For purposes of rating restrictions, if securities are rated differently by two or more rating agencies, the highest rating is used. The Fund will not invest in an obligation if the interest on that obligation is subject to the federal alternative minimum tax.   With respect to 20% of its net assets, the Fund may invest in municipal obligations that are not exempt from regular federal income tax, direct obligations of the U.S. Treasury and/or obligations of U.S. Government agencies, instrumentalities and government-sponsored enterprises.

The Fund invests primarily in general obligation or revenue bonds.  In pursuing its investment objective, the Fund seeks to weight investment in obligations such that at least 5% and not more than 15% of its net assets are invested in obligations with a final maturity in a year within the one-to-ten year maturity range (the “weighted investment strategy”).  The Fund does not have a specific target for its average portfolio duration.  When a municipal obligation has a final maturity of less than one year, the Fund intends to sell that security or let it mature and reinvest the proceeds in obligations with longer maturities.  With respect to the Fund’s weighted investment strategy, the Fund intends to invest at least 5% of its net assets in securities with a final maturity of 10 years within 90 days of the beginning of the calendar year.  The Fund’s portfolio is “laddered” by investing in municipal obligations with different final maturities so that some obligations age out of the one-to-ten year maturity range during each year.

The investment sub-adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment sub-adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio managers may also trade securities to seek to minimize capital gains to shareholders. These considerations may be taken into account alongside other factors in the investment selection process.

These returns reflect the maximum sales charge for Class A (3.25%) and any applicable contingent deferred sales charge (“CDSC”) for Class C.  Effective November 5, 2020, Class C shares automatically convert to Class A shares eight years after purchase.  The average annual total returns listed for Class C reflect conversion to Class A shares after eight years.  Prior to November 5, 2020, Class C shares automatically converted to Class A shares ten years after purchase.  Class A, Class C and Class I commenced operations on May 4, 2015. Investors cannot invest directly in an Index.

BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). BARCLAYS® is a trademark and service mark of Barclays Bank Plc (collectively with its affiliates, “Barclays”), used under license. Bloomberg or Bloomberg’s licensors, including Barclays, own all proprietary rights in the Bloomberg Barclays Indices. Neither Bloomberg nor Barclays is affiliated with Eaton Vance, and neither approves, endorses, reviews or recommends the Fund. Neither Bloomberg nor Barclays guarantees the timeliness, accurateness or completeness of any data or information relating to Bloomberg Short-Intermediate 1-10 Year Municipal Bond Index and Bloomberg Municipal Bond Index, and neither shall be liable in any way to Eaton Vance, investors in the Fund or other third parties in respect of the use or accuracy of Bloomberg Short-Intermediate 1-10 Year Municipal Bond Index and Bloomberg Municipal Bond Index or any data included therein.

After-tax returns are calculated using the highest historical individual U.S. federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.   After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.   After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.    Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal obligations with final maturities of between five and fifteen years, the interest on which is exempt from regular federal income tax (the “80% Policy”). For the purposes of the Fund’s 80% Policy, final maturity is defined as (i) the stated final maturity of a callable bond; (ii) the pre-refunded date of an existing pre-refunded bond; (iii) the earliest put date of a put bond; or (iv) the monthly re-set date of a municipal floating-rate bond or obligation. For municipal obligations held by the Fund that become pre-refunded after the Fund purchases such obligations, the final maturity of such obligation remains the stated maturity. All municipal obligations maturing within a calendar year will be defined as having the same final maturity. At least 90% of the Fund’s net assets normally is invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser or sub-adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser or sub-adviser (“junk bonds”). For purposes of rating restrictions, if securities are rated differently by two or more rating agencies, the highest rating is used. The Fund will not invest in an obligation if the interest on that obligation is subject to the federal alternative minimum tax. With respect to 20% of its net assets, the Fund may invest in municipal obligations that are not exempt from regular federal income tax, direct obligations of the U.S. Treasury and/or obligations of U.S. Government agencies, instrumentalities and government-sponsored enterprises.

The Fund invests primarily in general obligation or revenue bonds.  In pursuing its investment objective, the Fund seeks to weight investment in obligations such that at least 5% and not more than 15% of its net assets are invested in obligations with a final maturity in a year within the five-to-fifteen year maturity range (the “weighted investment strategy”).  The Fund does not have a specific target for its average portfolio duration.  When a municipal obligation has a final maturity of less than five years, the Fund intends to sell that security within a year and reinvest the proceeds in obligations with longer maturities.  With respect to the Fund's weighted investment strategy, the Fund intends to invest at least 5% of its net assets in securities with a final maturity of 15 years within 90 days of the beginning of the calendar year.  The Fund’s portfolio is “laddered” by investing in municipal obligations with different final maturities so that some obligations age out of the five-to-fifteen year maturity range during each year.

The investment sub-adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market.  In evaluating creditworthiness, the investment sub-adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio managers may also trade securities to seek to minimize capital gains to shareholders. These considerations may be taken into account alongside other factors in the investment selection process.

These returns reflect the maximum current sales charge for Class A (3.25%) and any applicable contingent deferred sales charge (“CDSC”) for Class C.  Effective November 5, 2020, Class C shares automatically convert to Class A shares eight years after purchase.  The average annual total returns listed for Class C reflect conversion to Class A shares after eight years.  Prior to November 5, 2020, Class C shares automatically converted to Class A shares ten years after purchase.  Effective April 15, 2015, the Fund changed its name, investment objective and investment strategy to invest at least 80% of its net assets in municipal obligations with final maturities of between five and fifteen years, the interest on which is exempt from regular federal income tax. Investors cannot invest directly in an Index.

BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). BARCLAYS® is a trademark and service mark of Barclays Bank Plc (collectively with its affiliates, “Barclays”), used under license. Bloomberg or Bloomberg’s licensors, including Barclays, own all proprietary rights in the Bloomberg Barclays Indices. Neither Bloomberg nor Barclays is affiliated with Eaton Vance, and neither approves, endorses, reviews or recommends the Fund. Neither Bloomberg nor Barclays guarantees the timeliness, accurateness or completeness of any data or information relating to Bloomberg 10 Year Municipal Bond Index, Bloomberg 15 Year Municipal Bond Index and Bloomberg Municipal Bond Index, and neither shall be liable in any way to Eaton Vance, investors in the Fund or other third parties in respect of the use or accuracy of Bloomberg 10 Year Municipal Bond Index, Bloomberg 15 Year Municipal Bond Index and Bloomberg Municipal Bond Index or any data included therein.

After-tax returns are calculated using the highest historical individual U.S. federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.   After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.   After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.    Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

The Fund's investment objective is to provide high current income exempt from regular federal income tax.

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund.  Investors may also pay commissions or other fees to their financial intermediary, which are not reflected below.  You may qualify for a reduced sales charge on purchases of Class A shares if you invest, or agree to invest over a 13-month period, at least $100,000 in Eaton Vance funds. Certain financial intermediaries also may offer variations in Fund sales charges to their customers as described in Appendix A – Financial Intermediary Sales Charge Variations in this Prospectus. More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 25 of this Prospectus and page 21 of the Fund’s Statement of Additional Information.

Market Risk.  The value of investments held by the Fund may increase or decrease in response to social, economic, political, financial, public health crises or other disruptive events (whether real, expected or perceived) in the U.S. and global markets and include events such as war, natural disasters, epidemics and pandemics, terrorism, conflicts and social unrest. These events may negatively impact broad segments of businesses and populations and may exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted. Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions.  Monetary and/or fiscal actions taken by U.S. or foreign governments to stimulate or stabilize the global economy may not be effective and could lead to high market volatility.  No active trading market may exist for certain investments held by the Fund, which may impair the ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such assets.

Municipal Obligations Risk. Because the Fund may invest in municipal obligations, the Fund may be susceptible to political, legislative, economic, regulatory, tax or other factors affecting issuers of these municipal obligations, such as state and local governments and their agencies. To the extent that the Fund invests in municipal obligations of issuers in the same state, U.S. territory, or economic sector, it could be more sensitive to economic, business or political developments that affect such state or sector. Municipal obligations and their issuers may be more susceptible to downgrade, loss of revenue, default and bankruptcy during periods of economic stress.  The amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less well-developed and less liquid than many other securities markets, which may limit the Fund’s ability to sell its municipal obligations at attractive prices. The differences between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress. Less liquid obligations can become more difficult to value and be subject to erratic price movements.

Interest Rate Risk. In general, the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase when interest rates fall and decline when interest rates rise.  Duration measures the time-weighted expected cash flows of a fixed-income security, while maturity refers to the amount of time until a fixed-income security matures.  Generally, securities with longer durations or maturities are more sensitive to changes in interest rates than securities with shorter durations or maturities, causing them to be more volatile.  Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may provide lower returns than fixed-income securities with longer durations or maturities.  Because the Fund is managed toward an income objective, it may hold more longer duration or maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return. In a rising interest rate environment, the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate.  

Credit Risk. Investments in municipal obligations and other debt obligations (referred to below as “debt instruments”) are subject to the risk of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because of concerns about the issuer’s ability to make principal and interest payments. In addition, the credit ratings of debt instruments may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates.  In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal or similar counsel, which may increase the Fund’s operating expenses and adversely affect net asset value.  Municipal obligations may be insured as to principal and interest payments. If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.

Lower Rated Investments Risk.  Investments rated below investment grade and comparable unrated investments (sometimes referred to as “junk”) are speculative because of increased credit risk relative to other fixed income investments. Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk. The Fund’s exposure to derivatives involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other investments. The use of derivatives can lead to losses because of adverse movements in the price or value of the security, instrument, index, currency, commodity, economic indicator or event underlying a derivative (“reference instrument”), due to failure of a counterparty or due to tax or regulatory constraints. Derivatives may create leverage in the Fund, which represents a non-cash exposure to the underlying reference instrument.  Leverage can increase both the risk and return potential of the Fund.  Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund. Use of derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. Changes in the value of a derivative (including one used for hedging) may not correlate perfectly with the underlying reference instrument. Derivative instruments traded in over-the-counter markets may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying reference instrument. If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in (or be unable to achieve) the return of collateral or other assets held by the counterparty. The loss

on derivative transactions may substantially exceed the initial investment.  A derivative investment also involves the risks relating to the reference instrument underlying the investment.

Risk of Residual Interest Bonds. The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond, including the risk of loss of principal.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase. As such, residual interest bonds tend to underperform the market for fixed rate bonds in rising long-term interest rate environments. The value and income of, and market for, residual interest bonds are volatile, and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense as a liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Leverage Risk.  Certain Fund transactions may give rise to leverage.  Leverage can result from a non-cash exposure to an underlying reference instrument. Leverage can also result from borrowings or participation in residual interest bond transactions. Leverage can increase both the risk and return potential of the Fund.  The use of leverage may cause the Fund to maintain liquid assets or liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations. Leverage may cause the Fund’s share price to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities. The Fund may not be able to adjust its use of leverage rapidly enough to respond to interest rate volatility, inflation, and other changing market conditions.  As a result, the Fund’s use of leverage may have a negative impact on the Fund’s performance from time to time.  The loss on leveraged investments may substantially exceed the initial investment.

Liquidity Risk.  The Fund is exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions, or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices.  Consequently, the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments to raise cash or abandon an investment opportunity, any of which could have a negative effect on the Fund’s performance. These effects may be exacerbated during times of financial or political stress.

Sector and Geographic Risk.  Because the Fund may invest a significant portion of its assets in obligations issued in one or more states and/or U.S. territories and in certain types of municipal obligations and/or in certain sectors, the value of Fund shares may be affected by events that adversely affect a state, U.S. territory, sector or type of obligation and may fluctuate more than that of a more broadly diversified fund.  General obligation bonds issued by municipalities can be adversely affected by economic downturns and any resulting decline in tax revenues.  Revenue bonds can be adversely affected by the negative economic viability of the facility or revenue source.

Transportation Sector Risk. To the extent the Fund invests a substantial portion of its assets in the transportation sector, factors that have an adverse impact on this sector may have a disproportionate impact on the Fund’s performance. The transportation sector can be affected by local and global economic conditions such as the price and availability of fuel, oil, and gas; government regulation; labor relations; operating and equipment costs; disruptive weather and environmental effects; mass casualty accidents; technological developments and disruptions; insurance costs; industry competition; and acts of war or terrorism that damage transportation systems. As a result, the value of the Fund’s shares may fluctuate more than that of a fund that does not invest significantly in companies in the transportation sector.

Risks of Principal Only Investments. Principal only investments entitle the Fund to receive the stated value of such investment when held to maturity. The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than obligations that pay interest currently. The Fund will accrue income on these investments and distribute that income each year. The Fund may be required to sell other investments to obtain cash needed for such income distributions.

U.S. Government Securities Risk. Different types of U.S. government securities are subject to different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. Although certain U.S. Government-sponsored agencies (such as the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association) may be chartered or sponsored by acts of Congress, their securities are neither issued nor guaranteed by the U.S. Treasury.  With respect to U.S. government securities that are not backed by the full faith and credit of the United States, there is a risk that the U.S. Government will not provide financial support to such U.S. government agencies, instrumentalities or sponsored enterprises if not obligated to do so by law. U.S. Treasury and U.S. Government agency securities generally have a lower return than other obligations because of their higher credit quality and market liquidity.  

Restricted Securities Risk.  Unless registered for sale to the public under applicable federal securities law, restricted securities can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by the Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.

Tax-Sensitive Investing Risk. The Fund may hold a security in order to achieve more favorable tax-treatment or sell a security in order to create tax losses. The Fund’s utilization of various tax-management techniques may be curtailed or eliminated by tax legislation, regulation or interpretations.  The Fund may not be able to minimize taxable distributions to shareholders and a portion of the Fund’s distributions may be taxable.

Tax Risk. Income from tax-exempt municipal obligations could be declared taxable because of changes in tax laws, adverse interpretations by the relevant taxing authority or the non-compliant conduct of the issuer of an obligation.

Risks Associated with Active Management.  The success of the Fund’s investment strategy depends on portfolio management’s successful application of analytical skills and investment judgment.  Active management involves subjective decisions and there is no guarantee that such decisions will produce the desired results or expected returns.

General Fund Investing Risks. The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective.  It is possible to lose money by investing in the Fund.  The Fund is designed to be a long-term investment vehicle and is not suited for short-term trading.  Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective(s).  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.  The Fund relies on various service providers, including the investment adviser and sub-adviser, if applicable, in its operations and is susceptible to operational, information security and related events (such as public health crises, cyber or hacking attacks) that may affect the service providers or the services that they provide to the Fund.  An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices. The returns in the bar chart are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower. Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

For the ten years ended December 31, 2024, the highest quarterly total return for Class A was 8.54% for the quarter ended December 31, 2023, and the lowest quarterly return was -6.23% for the quarter ended March 31, 2022.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2024 to March 31, 2025) was -0.31%.

Market Risk.  The value of investments held by the Fund may increase or decrease in response to social, economic, political, financial, public health crises or other disruptive events (whether real, expected or perceived) in the U.S. and global markets and include events such as war, natural disasters, epidemics and pandemics, terrorism, conflicts and social unrest. These events may negatively impact broad segments of businesses and populations and may exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted. Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions.  Monetary and/or fiscal actions taken by U.S. or foreign governments to stimulate or stabilize the global economy may not be effective and could lead to high market volatility.  No active trading market may exist for certain investments held by the Fund, which may impair the ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such assets.

Municipal Obligations Risk. Because the Fund may invest in municipal obligations, the Fund may be susceptible to political, legislative, economic, regulatory, tax or other factors affecting issuers of these municipal obligations, such as state and local governments and their agencies. To the extent that the Fund invests in municipal obligations of issuers in the same state, U.S. territory, or economic sector, it could be more sensitive to economic, business or political developments that affect such state or sector. Municipal obligations and their issuers may be more susceptible to downgrade, loss of revenue, default and bankruptcy during periods of economic stress.  The amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less well-developed and less liquid than many other securities markets, which may limit the Fund’s ability to sell its municipal obligations at attractive prices. The differences between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress. Less liquid obligations can become more difficult to value and be subject to erratic price movements.

Interest Rate Risk. In general, the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase when interest rates fall and decline when interest rates rise.  Duration measures the time-weighted expected cash flows of a fixed-income security, while maturity refers to the amount of time until a fixed-income security matures.  Generally, securities with longer durations or maturities are more sensitive to changes in interest rates than securities with shorter durations or maturities, causing them to be more volatile.  Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may provide lower returns than fixed-income securities with longer durations or maturities.  Because the Fund is managed toward an income objective, it may hold more longer duration or maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return. In a rising interest rate environment, the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate.  

Credit Risk. Investments in municipal obligations and other debt obligations (referred to below as “debt instruments”) are subject to the risk of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because of concerns about the issuer’s ability to make principal and interest payments. In addition, the credit ratings of debt instruments may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates.  In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal or similar counsel, which may increase the Fund’s operating expenses and adversely affect net asset value.  Municipal obligations may be insured as to principal and interest payments. If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.

Lower Rated Investments Risk.  Investments rated below investment grade and comparable unrated investments (sometimes referred to as “junk”) are speculative because of increased credit risk relative to other fixed income investments. Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk. The Fund’s exposure to derivatives involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other investments. The use of derivatives can lead to losses because of adverse movements in the price or value of the security, instrument, index, currency, commodity, economic indicator or event underlying a derivative (“reference instrument”), due to failure of a counterparty or due to tax or regulatory constraints. Derivatives may create leverage in the Fund, which represents a non-cash exposure to the underlying reference instrument.  Leverage can increase both the risk and return potential of the Fund.  Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund. Use of derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. Changes in the value of a derivative (including one used for hedging) may not correlate perfectly with the underlying reference instrument. Derivative instruments traded in over-the-counter markets may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying reference instrument. If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in (or be unable to achieve) the return of collateral or other assets held by the counterparty. The loss

on derivative transactions may substantially exceed the initial investment.  A derivative investment also involves the risks relating to the reference instrument underlying the investment.

Risk of Residual Interest Bonds. The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond, including the risk of loss of principal.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase. As such, residual interest bonds tend to underperform the market for fixed rate bonds in rising long-term interest rate environments. The value and income of, and market for, residual interest bonds are volatile, and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense as a liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Leverage Risk.  Certain Fund transactions may give rise to leverage.  Leverage can result from a non-cash exposure to an underlying reference instrument. Leverage can also result from borrowings or participation in residual interest bond transactions. Leverage can increase both the risk and return potential of the Fund.  The use of leverage may cause the Fund to maintain liquid assets or liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations. Leverage may cause the Fund’s share price to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities. The Fund may not be able to adjust its use of leverage rapidly enough to respond to interest rate volatility, inflation, and other changing market conditions.  As a result, the Fund’s use of leverage may have a negative impact on the Fund’s performance from time to time.  The loss on leveraged investments may substantially exceed the initial investment.

Liquidity Risk.  The Fund is exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions, or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices.  Consequently, the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments to raise cash or abandon an investment opportunity, any of which could have a negative effect on the Fund’s performance. These effects may be exacerbated during times of financial or political stress.

Sector and Geographic Risk.  Because the Fund may invest a significant portion of its assets in obligations issued in one or more states and/or U.S. territories and in certain types of municipal obligations and/or in certain sectors, the value of Fund shares may be affected by events that adversely affect a state, U.S. territory, sector or type of obligation and may fluctuate more than that of a more broadly diversified fund.  General obligation bonds issued by municipalities can be adversely affected by economic downturns and any resulting decline in tax revenues.  Revenue bonds can be adversely affected by the negative economic viability of the facility or revenue source.

Transportation Sector Risk. To the extent the Fund invests a substantial portion of its assets in the transportation sector, factors that have an adverse impact on this sector may have a disproportionate impact on the Fund’s performance. The transportation sector can be affected by local and global economic conditions such as the price and availability of fuel, oil, and gas; government regulation; labor relations; operating and equipment costs; disruptive weather and environmental effects; mass casualty accidents; technological developments and disruptions; insurance costs; industry competition; and acts of war or terrorism that damage transportation systems. As a result, the value of the Fund’s shares may fluctuate more than that of a fund that does not invest significantly in companies in the transportation sector.

Risks of Principal Only Investments. Principal only investments entitle the Fund to receive the stated value of such investment when held to maturity. The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than obligations that pay interest currently. The Fund will accrue income on these investments and distribute that income each year. The Fund may be required to sell other investments to obtain cash needed for such income distributions.

U.S. Government Securities Risk. Different types of U.S. government securities are subject to different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. Although certain U.S. Government-sponsored agencies (such as the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association) may be chartered or sponsored by acts of Congress, their securities are neither issued nor guaranteed by the U.S. Treasury.  With respect to U.S. government securities that are not backed by the full faith and credit of the United States, there is a risk that the U.S. Government will not provide financial support to such U.S. government agencies, instrumentalities or sponsored enterprises if not obligated to do so by law. U.S. Treasury and U.S. Government agency securities generally have a lower return than other obligations because of their higher credit quality and market liquidity.  

Restricted Securities Risk.  Unless registered for sale to the public under applicable federal securities law, restricted securities can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by the Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.

Tax-Sensitive Investing Risk. The Fund may hold a security in order to achieve more favorable tax-treatment or sell a security in order to create tax losses. The Fund’s utilization of various tax-management techniques may be curtailed or eliminated by tax legislation, regulation or interpretations.  The Fund may not be able to minimize taxable distributions to shareholders and a portion of the Fund’s distributions may be taxable.

Tax Risk. Income from tax-exempt municipal obligations could be declared taxable because of changes in tax laws, adverse interpretations by the relevant taxing authority or the non-compliant conduct of the issuer of an obligation.

Risks Associated with Active Management.  The success of the Fund’s investment strategy depends on portfolio management’s successful application of analytical skills and investment judgment.  Active management involves subjective decisions and there is no guarantee that such decisions will produce the desired results or expected returns.

General Fund Investing Risks. The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective.  It is possible to lose money by investing in the Fund.  The Fund is designed to be a long-term investment vehicle and is not suited for short-term trading.  Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective(s).  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.  The Fund relies on various service providers, including the investment adviser and sub-adviser, if applicable, in its operations and is susceptible to operational, information security and related events (such as public health crises, cyber or hacking attacks) that may affect the service providers or the services that they provide to the Fund.  An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices. The returns in the bar chart for periods since October 1, 2021 (inception date of Class W shares), are for Class W shares, which do not charge a sales charge. For periods prior to October 1, 2021 the performance information shown is that of the Class I shares of the Fund. Class I shares are not offered in this prospectus. Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

For the period from December 31, 2021 to December 31, 2024, the highest quarterly total return for Class W was 8.73% for the quarter ended December 31, 2023, and the lowest quarterly return was -6.07% for the quarter ended March 31, 2022.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2024 to March 31, 2025) was -0.02%.

The Class W performance shown above for the period prior to October 1, 2021 (commencement of operations) is the performance of Class I shares at net asset value without adjustment for any differences in the expenses of the two classes. If adjusted for such differences, returns would be different. Class I shares are not offered in this prospectus. Investors cannot invest directly in an Index.

BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). BARCLAYS® is a trademark and service mark of Barclays Bank Plc (collectively with its affiliates, “Barclays”), used under license. Bloomberg or Bloomberg's licensors, including Barclays, own all proprietary rights in the Bloomberg Barclays Indices. Neither Bloomberg nor Barclays is affiliated with BMR, and neither approves, endorses, reviews or recommends the Fund. Neither Bloomberg nor Barclays guarantees the timeliness, accurateness or completeness of any data or information relating to Bloomberg Municipal Bond Index, and neither shall be liable in any way to BMR, investors in the Fund or other third parties in respect of the use or accuracy of Bloomberg Municipal Bond Index or any data included therein.

After-tax returns are calculated using the highest historical individual U.S. federal income tax rate and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder’s tax situation and the characterization of distributions, and may differ from those shown.   After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.       Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.