Income explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.
The Income-tax Act, 2025 applies to income of tax years starting on or after its notified effective date. The 1961 Act is repealed but its savings clause keeps older assessments, appeals, losses, depreciation and TDS credits alive, so the switch-over is seamless for taxpayers.
Overview
Any replacement of a decades-old statute needs careful transition rules so that ongoing matters don't fall through the cracks. The 2025 Act pairs a repeal of the 1961 Act with detailed savings provisions. This guide explains the effective-date logic and how balances built up under the old law carry forward.
What the Old Act Said
The 1961 Act governed all income until its repeal — its charge, computation, assessment machinery, appeals under sections 246A onwards, carry-forward of losses under sections 70 to 80, unabsorbed depreciation under section 32(2), and MAT/AMT credit under sections 115JAA/115JD. Every such balance and every pending proceeding sat within that framework.
What the New Act 2025 Changes
The 2025 Act takes effect for tax years commencing on or after the date it is brought into force, while its transition machinery ensures continuity:
- Repeal with savings. The 1961 Act is repealed, but a savings clause preserves anything done, any right accrued and any liability incurred under it.
- Pending proceedings continue. Assessments, reassessments, appeals, revisions, rectifications and refunds for pre-transition years proceed as if the old Act were still in force.
- Balances carry forward. Brought-forward business/capital losses, unabsorbed depreciation and MAT/AMT credit migrate to the corresponding 2025-Act provisions.
- Withholding credits preserved. TDS/TCS already deducted or collected and reflected in the annual statement remain creditable.
Old → New Mapping
| 1961 Act item | Transition treatment under 2025 Act |
|---|---|
| Pending assessment / reassessment | Completed under the 1961 Act via savings clause |
| Appeals & revisions (s.246A, s.263/264) | Continue under old provisions for old years |
| Carry-forward losses (s.70–80) | Set off under corresponding 2025-Act loss provisions |
| Unabsorbed depreciation (s.32(2)) | Carried forward under new depreciation rules |
| MAT/AMT credit (s.115JAA/115JD) | Preserved and adjusted under the new law |
| Notifications & circulars | Continue if consistent, until superseded |
Where the exact new clause number for a transition provision is still settling, treat it as the successor to the old section noted above rather than assuming a precise number.
Practical Impact / Examples
A company carrying ₹40,00,000 of brought-forward business loss and ₹15,00,000 of unabsorbed depreciation from earlier years continues to set these off in the first tax year under the 2025 Act. An individual with a reassessment notice for an older year answers it under the 1961 Act framework. TDS of ₹1,20,000 reflected in the annual statement is claimed exactly as before.
Transition Tips
- Reconcile brought-forward losses and depreciation before the first 2025-Act return so nothing is lost.
- Maintain two reference sets during transition — 1961-Act citations for legacy years, 2025-Act for current ones.
- Watch for CBDT transition notifications and update your compliance calendar.
- Don't re-open settled positions merely because section numbers changed.