Most coverage of the new Income Tax Act oversells it as a revolution or buries the real changes under section-number trivia. Neither helps you prepare. Here’s the practical version.
The Income Tax Act, 2025 replaces the Income Tax Act, 1961 from 1 April 2026 (Tax Year 2026-27 onward). Tax rates, slabs, and deductions stay the same. What changed is structure, language, and section numbering.
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Quick Summary — What Changed vs. What Didn’t
| Changed | Unchanged |
| “Assessment Year” + “Previous Year” → single “Tax Year” | Tax rates and slabs (Budget 2025 rates carry over) |
| 819 sections → 536 sections, 14 → 16 schedules | Deductions (80C, 80D, etc. — relocated, not removed) |
| TDS scattered across 40+ sections → Section 392 (salary) and 393 (everything else, via payment codes) | PAN, TAN, filing infrastructure |
| TCS moved from Section 206C to Section 394 | ITR due dates (calendar dates stay the same) |
| All FY 2025-26 filings (AY 2026-27) — still fully governed by the old 1961 Act |
| Period | Applicable Law |
|---|---|
| Income earned up to 31 March 2026 | Income-tax Act, 1961 |
| Income earned from 1 April 2026 | Income Tax Act, 2025 |
| Pending appeals & assessments relating to earlier years | Continue under 1961 Act |
| New Tax Year 2026-27 onward | Income Tax Act, 2025 |
The One Concept Change Worth Understanding
The old Act ran on two overlapping year concepts. “Previous Year” meant when you earned the income. “Assessment Year” meant when the department taxed it. This dual system caused real, recurring confusion. No one ever found it easy to explain why a client’s FY 2023-24 income gets assessed in AY 2024-25. The new Act collapses both into one concept: the Tax Year — a straightforward 12-month period, 1 April to 31 March. The timing mechanics haven’t changed. Only the naming has.
One of the biggest misconceptions after the new Act was passed is that taxpayers would suddenly have new tax rates, deductions or return filing procedures. That isn’t the case. For most individuals and businesses, the actual tax calculation remains substantially the same. The new law primarily reorganises and simplifies the legislation rather than introducing an entirely new tax system. Most changes are structural rather than financial.
Who Should Read the New Act Carefully?
The transition affects different taxpayers differently.
- Individuals with salary income will mostly notice updated terminology and section references.
- Businesses and professionals need to update tax documentation, internal SOPs and compliance manuals.
- Chartered Accountants and tax practitioners should immediately start citing the new section numbers in advice relating to Tax Year 2026-27 onward.
- Software providers need to update payroll, TDS and tax compliance modules to reflect the new coding structure.
Why TDS Citations Need a Second Look
This change has the most day-to-day impact for anyone doing compliance work. The old Act scattered TDS provisions across more than 40 sections — 192, 194A, 194C, 194H, 194I, 194J, 194Q, and others. Each carried its own threshold and format. The new Act consolidates almost all of this into two parent sections. Section 392 covers salary TDS, replacing the old Section 192. Section 393 covers every other payment type, using a tabular structure with payment codes instead of standalone section numbers. TCS moves from Section 206C to Section 394.
The rates haven’t moved. Professional fees TDS is still 10%. But the section number you cite has changed — and citing the old number for a payment made on or after 1 April 2026 is now genuinely incorrect, not just outdated style.
| Old Act (1961) | New Act (2025) | Topic |
|---|---|---|
| Section 192 | Section 392 | TDS on Salary |
| Section 194 series | Section 393 | TDS on Other Payments |
| Section 206C | Section 394 | TCS |
| Section 234B | Section 424 | Interest for Default in Advance Tax |
| Section 234C | Section 425 | Interest for Deferment of Advance Tax |
What This Means for FY 2025-26 Filings Right Now
If you’re filing your ITR for FY 2025-26 (AY 2026-27) this July, none of this affects you yet. That return falls entirely under the old 1961 Act — same forms, same section references, same portal flow. The new Act only governs income earned from 1 April 2026 onward (Tax Year 2026-27). Anything from before that date, including ongoing assessments and pending proceedings, continues under the old Act’s transitional provisions.
A Practical Checklist for the Transition
- Don’t switch client letters, software templates, or internal documentation to “Tax Year” terminology for anything tied to FY 2025-26. That return keeps the old terminology.
- From 1 April 2026 onward, cite the new section numbers (392/393/394) for TDS/TCS matters.
- Check whether your accounting or payroll software has updated for the new payment-code structure. This is an operational dependency, not just a documentation update.
- Treat blog posts, guides, or internal memos written before mid-2026 with caution on section citations specifically. This detail is going stale fast right now.
Frequently Asked Questions
What Happens Next?
Although the Income Tax Act, 2025 is now in force, practitioners should expect additional CBDT circulars, utilities, FAQs and software updates over the coming months. During the first year of any major legislative transition, operational guidance often evolves as practical implementation issues emerge. Before relying on a specific section reference or procedural requirement, it is sensible to verify the latest notifications and departmental clarifications.
Does the new Act change how much tax I pay?
No. Rates, slabs, and deductions stay the same. This is a structural and linguistic simplification, not a tax policy change.
Do I need to refile anything because of this transition?
No. Returns and assessments for periods before 1 April 2026 continue under the old Act exactly as before.
Will old circulars and notifications still apply?
Yes, where they don’t conflict with the new Act’s provisions. The transition doesn’t wipe out existing departmental guidance.
Is there a tool to map old sections to new ones?
Yes. The Income Tax Department released a section-mapping utility for this transition. Bookmark it if you cite sections regularly.
References
- Income Tax Act, 2025 (enacted August 2025, effective 1 April 2026)
- Income Tax Department’s “Objective and Scope of the New Act” FAQ page, incometax.gov.in
Last Updated: 26 June 2026
Reviewed By: TaxKitab Team
This transition directly affects how we cite sections in our advance tax and TDS on rent posts. Both flag exactly where the old and new numbering diverge.
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