New Income Tax Act 2025: 5 Changes Taking Effect From April 2026

By Nitish Bharadwaj · Published Jul 4, 2026 · 6 min

The Income Tax Act, 2025 replaces the Income Tax Act, 1961 from April 1, 2026, condensing 819 sections into 536 and merging the confusing "Previous Year" and "Assessment Year" concepts into one unified "Tax Year." Tax rates, slabs, and deductions are unchanged — this is a structural rewrite, not a new tax regime. Crucially, it applies to income earned from FY 2026-27 onwards; the return most taxpayers are filing by July 31, 2026 for FY 2025-26 is still governed entirely by the old 1961 Act. This guide explains the 5 changes that matter and the one date that decides which Act applies to you.

For 64 years, every Indian taxpayer has filed returns under the Income Tax Act, 1961. That changes on April 1, 2026, when the Income Tax Act, 2025 takes over — a full replacement of the law, not an amendment to it. The headlines make it sound dramatic, but most of what changes is how the law is written and organised, not how much tax you pay. Here are the 5 changes that actually matter, and the one date that decides whether the new Act even applies to the return you are filing this year.

Change 1: One "Tax Year" Replaces "Previous Year" and "Assessment Year"

The 1961 Act ran on two parallel year concepts that confused generations of taxpayers: the "Previous Year," when you actually earned the income, and the "Assessment Year," the following year when that income gets assessed and taxed. The 2025 Act scraps both and replaces them with a single "Tax Year" — a straightforward 12-month period from April 1 to March 31, corresponding to what used to be the Previous Year. Income is still assessed after the Tax Year ends, so the underlying timeline of earning-then-filing does not change; only the confusing dual naming does.

Change 2: The Law Itself Is Roughly a Third Shorter

The Income Tax Act, 1961 had swelled to 819 sections across 23 chapters after six decades of amendments layered on top of each other. The 2025 Act consolidates this down to 536 sections while keeping the same 23-chapter structure — a reorganisation aimed at reducing the interpretive disputes that a sprawling, patched-together law tends to generate. As one specific example of this consolidation, TDS provisions that were scattered across roughly two dozen separate sections in the old Act are now grouped under a single section in the new one, which should make it considerably easier to look up the correct TDS rate for a given payment.

Change 3: Tax Rates and Deductions Are Not Changing — This Is Not a New Tax Regime

Change 4: It Applies From FY 2026-27 — Not to the Return You Are Filing Right Now

This is the detail with the most immediate practical consequence, and it is easy to get backwards. The Income Tax Act, 2025 governs the Tax Year 2026-27 onwards — that is, income you earn between April 1, 2026 and March 31, 2027. The return most salaried taxpayers are filing by July 31, 2026 covers FY 2025-26 income (AY 2026-27 under the old naming), and that return remains entirely governed by the Income Tax Act, 1961, regardless of the fact that the new Act has already come into force by the time you file it. Our complete ITR filing guide for AY 2026-27 and ITR-1 vs ITR-2 guide both apply to that filing — nothing about the new Act changes the forms, deadlines, or rules covered there this year.

Change 5: Pending Cases Stay Under the Old Act

A transitional provision in the new law specifically protects continuity: any assessment, appeal, penalty proceeding, or other matter already pending as of April 1, 2026 continues to be governed by the Income Tax Act, 1961 until it is resolved, rather than being restarted or reinterpreted under the new sections. If you have an ongoing dispute or a notice under the old Act, the change in law does not reset or alter that process.

The gift-taxation rule is a good concrete example of what this renumbering actually looks like in practice: the familiar Section 56(2)(x), which taxes gifts over ₹50,000 from non-relatives, now sits at Section 92(2)(m) for anything received in Tax Year 2026-27 onward, with the underlying ₹50,000 threshold and relative exemptions completely unchanged. Our gift tax rules guide has the full breakdown of what's taxable and what's exempt under either citation.

1. Filing your return for FY 2025-26 (due July 31, 2026)? You are under the old Income Tax Act, 1961 — nothing changes for you this cycle
2. Earning income from April 1, 2026 onwards (Tax Year 2026-27)? That income, and the return you file for it next year, falls under the new Income Tax Act, 2025
3. Have a pending assessment, appeal, or notice from before April 1, 2026? It stays under the 1961 Act until resolved
4. Tax planning for FY 2026-27? Base your numbers on current slabs and deduction limits — the new Act does not itself change any of them

The practical takeaway is simple: nothing about your July 31, 2026 filing changes because of this new law. The real adjustment comes a year from now, when you start seeing "Tax Year 2026-27" instead of "AY 2027-28" on tax portal screens, Form 16, and TDS certificates — a naming change worth getting used to early so it does not trip you up when it actually starts showing up on your paperwork. If a mismatch between what your TDS certificate says and what you expect ever holds up a refund, our guide to delayed ITR refunds covers the most common causes and fixes.