Section-by-Section Mapping: Old Act (1961) to New Act (2025)

For: Tax professionals, compliance teams, and software/systems administrators who need a reliable method — not just a static list — for translating old section references into the new Act.

Every practitioner’s first practical question about the Income-tax Act, 2025 is the same: “Where did my section go?” This article does not attempt to reproduce a full 819-to-536 mapping table (any such table needs to be verified against the official source before use, and is liable to be superseded by later CBDT corrigenda) — instead, it explains the authoritative mapping tool, walks through the confirmed high-value mappings professionals rely on daily, and sets out a verification workflow so your practice isn’t caught out by an unofficial or outdated table circulating online.

The Authoritative Source: Form 121 and the Concordance Utility

The CBDT has issued Form 121 as the official section-wise mapping document correlating provisions of the Income-tax Act, 1961 with their corresponding provisions in the Income-tax Act, 2025. In addition, the Income Tax Department’s e-filing portal hosts a “Utility to check provisions of Income-tax Act, 1961 vis-à-vis Income-tax Act, 2025”, which allows a two-way lookup: enter an old section number to find its 2025 equivalent, or vice versa. This utility — not a third-party blog table — should be treated as the primary reference point for any filing, opinion, or client advisory.

A parallel utility exists for the Rules: “Utility to check provisions of Income-tax Rules, 1962 vis-à-vis Income-tax Rules, 2026”, along with a forms-mapping utility for the reduced 190-form set under the Income-tax Rules, 2026.

Confirmed High-Value Mappings (Verify Before Use)

The following mappings are well-documented and consistently reported across CBDT guidance and professional commentary as of publication. They are the mappings professionals will use most often, but should still be cross-checked against the live concordance utility before being relied on in a filing:

Why a Static Table Is Risky to Rely On Alone

Three practical reasons professionals should treat any printed mapping table (including the one above) as a starting point rather than a final answer:

1.          Renumbering is not always 1:1. Because the 2025 Act consolidates fragmented provisions (the TDS example above being the clearest case — roughly 60 old sections collapsing into 3 new ones), a single old section sometimes maps to a sub-part of a new section’s structured table, not to a whole new section. Citing “Section 393” without specifying the relevant table/sub-clause may be imprecise for formal submissions.

2.          Corrigenda and clarificatory notifications. As with any newly enacted consolidating statute, the CBDT has continued issuing FAQs and clarifications after the Act’s passage (for example, FAQs on BIS exemption and FII exemption issued after enactment) — some of which touch on section interpretation. A table compiled at one point in time may not reflect the latest clarification.

3.          Chapter-level renumbering affects cross-references. Because provisions have been regrouped by topic, a section that cross-refers to “sub-section (2) of section X” under the 1961 Act may now cross-refer to a differently structured provision — mechanical substitution of section numbers without reading the surrounding text can produce an incorrect result.

Judicial Precedents & Their Continued Relevance

There is not yet a developed body of case law specifically interpreting the mapping between the 1961 and 2025 Acts, since the new Act’s operative provisions apply prospectively from Tax Year 2026-27. However, the established interpretive principle from cases such as Gammon India Ltd. v. Special Chief Secretary — that where a repealing statute is a consolidating re-enactment on the same subject, courts look to the new Act’s provisions primarily to determine whether they manifest an intention to change the substance of the old law, not merely its form — will likely guide how tribunals and courts treat interpretive disputes arising from renumbering in the years ahead. Until a settled body of precedent develops specifically under the 2025 Act, professionals should rely on the CBDT’s official concordance and departmental FAQs as the primary interpretive aid, supplemented by 1961-era precedent on the substance of a provision where the new section’s wording is materially unchanged.

Practical Example

A compliance team maintaining a TDS deduction matrix keyed to old section numbers (194C for contractors, 194J for professional fees, 194-IA for property purchases, etc.) should not attempt to manually reassign new section numbers based on assumption. Instead, run each old section through the official concordance utility, confirm which table/sub-clause of Section 393 applies, and rebuild the matrix with both the old and new references shown side by side for at least the first two Tax Years post-transition, to support any queries on prior-year deductions during that window.

Points of Caution for Professionals

•             Never cite a new-Act section number in a formal opinion, return, or submission without confirming it against the live CBDT concordance utility or Form 121 — third-party tables (including this one) can go stale.

•             Where a single old section has been absorbed into a consolidated new section with multiple tables, specify the applicable table/sub-clause, not just the section number.

•             Re-verify mappings periodically through the transition period, as clarificatory FAQs and notifications continue to be issued.

•             Maintain a dual-reference (old/new) system in internal documentation for at least two Tax Years to support queries on transactions that straddle the transition date.

•             Train junior staff not to “pattern-match” old section behaviour onto a similarly-numbered new section without reading the actual text — renumbering has not been strictly sequential across all chapters.

Compliance Checklist

•             ☐ Bookmark and use the official e-filing portal concordance utility as the default reference tool.

•             ☐ Rebuild internal compliance checklists and TDS matrices with verified dual references.

•             ☐ Subscribe to CBDT circulars/FAQs specifically tagged to the Income-tax Act, 2025 for updates to the mapping.

•             ☐ Schedule a quarterly internal review during FY 2026-27 to catch any mapping corrections issued after go-live.

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