Income Tax Act 2025 Section Mapper

Section Mapper › Section 139

Old Section 139 → New Section 263

Return of income

Old Act (1961)Section 139
New Act (2025)Section 263
Applies from1 April 2026 (Tax Year 2026-27). Returns for FY 2025-26 (AY 2026-27) still use the old number.

Covers original, belated, revised and updated returns.

Sources

TaxGuru — Income-tax Act 2025 vs 1961: Section Mapping Cheat Sheet, TaxGST.in — Income Tax Act 2025: Old Vs New Sections And Forms, Durgesh Chavda (CA) — Income-tax Act 2025 Section Mapping

Also check the official CBDT concordance (Form 121) and the e-filing portal's comparison utility at incometax.gov.in.

Frequently asked questions

What is the new section for 139?
Section 263 of the Income-tax Act, 2025. It covers original, belated, revised and updated returns.
Which Act applies to returns for FY 2025-26?
The 1961 Act. Returns for FY 2025-26 (AY 2026-27) are filed under the old Act with old section numbers. The 2025 Act applies to income from 1 April 2026 onward.

Not sure which law applies to you? Answer 3 questions → · Full printable cheat sheet →