Taxpayers filing returns for Assessment Year 2026-27 must use the Income-tax Act, 1961, despite the new 2025 law. The tax rules are based on when you earned your income, not when you file your return. Filings for income earned during Financial Year 2025-26 are not affected by the new legislation.
Many Indian taxpayers are facing confusion as the income tax filing season arrives alongside the implementation of the new Income-tax Act, 2025. While the new law replaced the legacy Income-tax Act, 1961, starting April 1, 2026, it does not apply to the returns currently being processed for Assessment Year 2026-27.
Why the Old Law Still Applies
The fundamental rule for income tax is that the laws governing your tax return are determined by the financial year in which you earned the money, not the date you submit your paperwork to the tax department. Since the returns currently being filed are for income generated during Financial Year 2025-26, which ended on March 31, 2026, all calculations must be completed using the provisions of the 1961 Act. This includes all existing rules for tax slabs, deductions, and exemptions that were in place during that period. Filing your return after April 1, 2026, does not change the law applicable to that specific income.
Clarifying Transition Doubts
There is no requirement for taxpayers to file two separate tax returns or attempt to apply the new 2025 regulations to current filings. Experts at the Bombay Chartered Accountants Society have confirmed that the 1961 Act remains the only valid framework for these filings. Taxmann also clarified that the compliance burden has not been doubled; taxpayers should proceed with the standard ITR forms designated for AY 2026-27 as they have in previous years. Any attempt to apply new 2025 provisions prematurely could lead to incorrect tax calculations and potential scrutiny from tax authorities.
When the New Act Takes Effect
The Income-tax Act, 2025, will officially govern tax matters for income earned during the ongoing Financial Year 2026-27. This means that when taxpayers prepare their returns next year, they will need to familiarize themselves with the new compliance framework, updated deduction structures, and different filing deadlines established under the 2025 legislation. For now, the most important step for investors and salaried individuals is to ensure their AY 2026-27 returns are filed accurately under the established 1961 guidelines to avoid errors. Investors should focus on ensuring their income disclosures match their records for the period ending March 31, 2026, and use the existing online portal features that are currently calibrated for the 1961 Act.