Income Tax Act, 2025 vs Income Tax Act, 1961: A Complete Structural Comparison

For: Chartered Accountants, corporate tax teams, CFOs, and in-house counsel preparing for the transition to the new tax code.

From 1 April 2026, the Income-tax Act, 1961 stands repealed and the Income-tax Act, 2025 takes over as the governing statute for direct taxes in India, applicable from Tax Year 2026-27 (corresponding to what would earlier have been Assessment Year 2027-28). For professionals, the immediate question isn’t “what’s the new tax policy” — rates, slabs, and core principles remain substantially the same — it’s “what has moved, what has been renamed, and where do I now find what I used to know by section number.” This article lays out the structural differences at a glance, before later articles in this series go section-by-section.

1961 Act vs 2025 Act: Quick Reference

What Actually Changed

1. Consolidation, not reinvention. The government’s stated objective was to reduce the compliance burden and interpretive complexity built up over six decades of amendments — not to alter tax policy. Explanations and provisos that were tacked onto the 1961 Act over the years have been folded into the main text of sections, redundant and obsolete provisions have been dropped, and tables/formulas now replace dense narrative drafting in several places.

2. Chapter reorganisation. The new Act regroups provisions by topic more logically — for instance, all TDS-related provisions now sit together, and definitions relevant to a chapter are placed closer to their point of use, rather than scattered across the Act as under the 1961 framework.

3. Sequential numbering. One of the more disorienting changes for practitioners used to citing “Section 80CCD(1B)” or “Section 194-IA” is that the 2025 Act does away with alphanumeric suffixes. Every section is now numbered sequentially, which means old muscle-memory citations no longer point to the right provision — this is the single biggest practical adjustment required in year one.

4. Rules and forms reduced. The Income-tax Rules, 2026 cut the rule count from 511 to 333, and forms from 399 to 190, generally by merging overlapping forms (for example, Form 15G and Form 15H have been merged into a single new Form 121, which doubles as the official concordance/mapping document between old and new sections).

What Has Not Changed

•             Tax rates, slabs, and the Section 87A-type rebate structure continue to be set by the annual Finance Act, and are carried across unchanged into the new Act for FY 2026-27.

•             Deductions and exemptions available under the old and new personal tax regimes are, in substance, retained (though renumbered) — see our separate article on Chapter VI-A deductions.

•             Assessments, orders, and proceedings validly completed under the 1961 Act before 1 April 2026 remain valid; the new Act does not reopen or disturb them (see our dedicated article on transitional provisions).

•             The core charge to tax — total income of a person taxed at rates prescribed by the relevant Finance Act — is retained; only the terminology (“tax year” replacing “previous year”/“assessment year”) has changed in how that charge is expressed.

Judicial Precedents & Their Continued Relevance

Because the 2025 Act is a consolidating and simplifying re-enactment rather than a policy overhaul, the general principle from Indian statutory interpretation is that case law built up under the 1961 Act should continue to guide interpretation of the corresponding 2025 provision, provided the operative language has not materially changed. The Supreme Court’s approach in CIT v. Shah Sadiq & Sons (dealing with continuity of rights on repeal and re-enactment) and the broader jurisprudence on repeal-and-savings under Section 6 of the General Clauses Act, 1897 (discussed in detail in our separate article on transitional provisions) support this reading. That said, practitioners should not assume this automatically — each precedent should be checked against the actual wording of the 2025 Act provision before being relied upon, since simplification in drafting occasionally does change scope even where the section heading looks familiar.

Practical Example

A tax manager reviewing a client’s TDS obligation on professional fees under the old Section 194J will, from FY 2026-27, need to locate the corresponding provision within the consolidated Section 393 framework of the 2025 Act (which now houses TDS obligations across residents, non-residents, and “any person” in structured tables) rather than searching for a like-numbered section. Filing systems, internal checklists, and audit working papers referencing “194J” by name should be updated to reference both the old and new numbers during the transition period, to avoid confusion in cross-year audits.

Points of Caution for Practitioners

•             Do not assume a “similar-sounding” new section number replicates the old provision exactly — always confirm against the CBDT’s official Form 121 concordance table.

•             Update internal templates, audit working papers, and client advisory notes to carry dual references (old section / new section) through at least FY 2026-27 and FY 2027-28, to avoid confusion when reviewing prior-year files.

•             For matters straddling the transition date, identify explicitly which Act governs which part of the transaction or proceeding — don’t assume continuity without checking the specific transitional provision.

•             Treat the reduction in section count as a drafting simplification, not a substantive relaxation — verify whether any specific compliance obligation has actually changed before advising a client that it has been removed.

•             Keep a documented file note of the section-mapping basis used for any material tax position taken during the transition years, given the higher-than-usual interpretive risk in year one.

Compliance Checklist

•             ☐ Cross-map all internal SOPs and compliance calendars to new section numbers using the official CBDT concordance.

•             ☐ Update TDS/TCS deduction workflows to reference Sections 392–394 in place of the old numbering.

•             ☐ Brief finance, payroll, and procurement teams on the “tax year” terminology change.

•             ☐ Retain the 1961 Act text and old section references for any FY 2025-26-and-earlier matters still under assessment or appeal.

Disclaimer: This article is intended for general informational and educational purposes only and does not constitute legal, tax, or professional advice. While reasonable care has been taken to ensure accuracy as of the date of publication, the Income Tax Act, 2025, the Income-tax Rules, 2026, and related notifications, circulars, and judicial precedents are subject to amendment, clarification, and interpretation. Readers should independently verify all section references, rates, thresholds, and case law citations against official government sources (incometax.gov.in, incometaxindia.gov.in) and should consult a qualified Chartered Accountant, tax advisor, or legal professional before acting or relying on this content for filings, compliance, or transaction decisions. The author(s) and publisher accept no liability for any loss arising from reliance on this content.