| Schedule of breakdown of changes in provisions for cases in which an unfavorable outcome is probable, in addition to contingent liabilities and provisions for dismantling |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Provision for contingencies | | | | | | | | | | | | Tax(1) | | Regulatory(1) | | Civil | | Labor | | Contingent liabilities (PPA) | | Provision for fines for canceling lease agreements | | Provision for asset decommissioning | | Amounts to be refunded to customers | | Total | | Balance on December 31, 2023 | 2,753,323 | | | 1,760,866 | | | 1,226,995 | | | 693,712 | | | 1,002,901 | | | 40,993 | | | 407,246 | | | 96,601 | | | 7,982,637 | | | Additions (reversal), net (Note 27.) | 40,063 | | | (377,510) | | | 251,429 | | | 420,471 | | | (12,517) | | | (10,798) | | | (5,083) | | | — | | | 306,055 | | | Other additions (reversal)(1) | (489,082) | | | — | | | — | | | — | | | (410) | | | 14,929 | | | 9,642 | | | — | | | (464,921) | | | Write-offs due to payment | (70,922) | | | (16,299) | | | (340,327) | | | (423,720) | | | — | | | (4,119) | | | — | | | (5,938) | | | (861,325) | | | Business combination – IPNET (Note 1.c.3.) | 55,001 | | | — | | | — | | | 31,669 | | | 8,964 | | | — | | | — | | | — | | | 95,634 | | | Interest accruals (Note 28.) | (265,396) | | | (215,962) | | | 273,044 | | | 213,409 | | | 76,201 | | | — | | | 409 | | | — | | | 81,705 | | | Balance on December 31, 2024 | 2,022,987 | | | 1,151,095 | | | 1,411,141 | | | 935,541 | | | 1,075,139 | | | 41,005 | | | 412,214 | | | 90,663 | | | 7,139,785 | | | Additions (reversal), net (Note 27) | 106,581 | | | 16,042 | | | 257,986 | | | 377,994 | | | (26,740) | | | 3,296 | | | (25,920) | | | (90,663) | | | 618,576 | | | Other additions (reversal)(1) | (75,119) | | | (172,320) | | | — | | | 2 | | | — | | | — | | | 10,002 | | | — | | | (237,435) | | | Write-offs due to payment | (62,457) | | | (10,162) | | | (392,614) | | | (519,069) | | | (1,544) | | | (2,351) | | | — | | | — | | | (988,197) | | | Business combination – IPNET (Note 1.c.3) | (38,123) | | | — | | | — | | | (24,795) | | | — | | | — | | | — | | | — | | | (62,918) | | | Business combination – Samauma (Note 1.c.1) | 4,784 | | | — | | | — | | | 573 | | | 2,462 | | | — | | | — | | | — | | | 7,819 | | | Business combination – FiBrasil (Note 1.c.2) | — | | | — | | | — | | | 1,528 | | | 24,065 | | | — | | | — | | | — | | | 25,593 | | | Business combination – Cyber (Note 1.c.6) | 1,663 | | | — | | | — | | | 158 | | | — | | | — | | | — | | | — | | | 1,821 | | | Net interest accruals (Note 28.) | 144,755 | | | 89,307 | | | 158,152 | | | 206,620 | | | 113,253 | | | — | | | 14,228 | | | — | | | 726,315 | | | Balance on December 31, 2025 | 2,105,071 | | | 1,073,962 | | | 1,434,665 | | | 978,552 | | | 1,186,635 | | | 41,950 | | | 410,524 | | | — | | | 7,231,359 | | | | | | | | | | | | | | | | | | | | | Balance on December 31, 2024 | | | | | | | | | | | | | | | | | | | Current | 160,947 | | | 195,063 | | | 573,679 | | | 701,300 | | | 5,075 | | | 41,005 | | | 3,265 | | | 90,663 | | | 1,770,997 | | | Non-current | 1,862,040 | | | 956,032 | | | 837,462 | | | 234,241 | | | 1,070,064 | | | — | | | 408,949 | | | — | | | 5,368,788 | | | Total | 2,022,987 | | | 1,151,095 | | | 1,411,141 | | | 935,541 | | | 1,075,139 | | | 41,005 | | | 412,214 | | | 90,663 | | | 7,139,785 | | | | | | | | | | | | | | | | | | | | | Balance on December 31, 2025 | | | | | | | | | | | | | | | | | | | Current | 89,274 | | | 55,651 | | | 749,193 | | | 662,626 | | | 8,166 | | | 41,950 | | | 596 | | | — | | | 1,607,456 | | | Non-current | 2,015,797 | | | 1,018,311 | | | 685,472 | | | 315,926 | | | 1,178,469 | | | — | | | 409,928 | | | — | | | 5,623,903 | | | Total | 2,105,071 | | | 1,073,962 | | | 1,434,665 | | | 978,552 | | | 1,186,635 | | | 41,950 | | | 410,524 | | | — | | | 7,231,359 | |
(1)In 2025 and 2024, relevant events occurred in the movements of tax and regulatory provisions, as follows: in 2025: (i) tax: due to the Company's adherence to tax amnesty programs in several states of the Federation with gains from the reversal of operating expenses for contingency provisions of R$25,638 (note 27), gains from the reversal of financial expenses for monetary updating of contingency provisions of R$65,990 (note 28), and assumption of debt of R$75,119 (note 21)..; and (ii) regulatory: due to adherence to the Desenrola program. In 2024, relevant events occurred in the movements of provisions, namely: (i) Tax: write-off of R$885,471 due to the Company's adherence to tax amnesty programs in the States of SP and PR, with gains from the reversal of operating expenses of provision for contingencies of R$26,546 (note 27.), gains from the reversal of financial expenses of monetary updating of provisions for contingencies of R$374,271 (Note 28.) and assumption of debt of R$484,654 (Note 21.); and (ii) Regulatory: write-off of R$792,378 as a result of the Commitment Term Related to the Self-Composition Negotiations for Adapting the STFC Concession Contracts to Authorization Instruments, with gains from the reversal of operating expenses for contingency provisions of R$386,392 (Note 27.) and gains from the reversal of financial expenses for monetary updating of contingency provisions of R$405,986 (Note 28.).
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