The New Income-Tax Act 2025 Is Live from 1 April 2026 — A Plain-English Guide for Indian Business Owners
Quick answer: The new Income-tax Act, 2025 replaced the six-decade-old Income-tax Act, 1961 on 1 April 2026. The good news for business owners: your tax rates, deductions, and exemptions have not changed. The real change is *how the law is written and organised* — cleaner language, fewer sections, and one big new idea called the "Tax Year." Income up to 31 March 2026 is still governed by the old Act; income from 1 April 2026 onwards follows the new one.
If you have been hearing about a "new tax law" and worrying about a higher bill, relax — and read on. This is mostly a clean-up, not a tax hike.
What is the new Income-Tax Act 2025?
The Income-tax Act, 1961 had been amended hundreds of times over six decades. It became long, repetitive, and hard to read even for professionals. The Income-tax Act, 2025 rewrites the whole thing into a clearer, modern structure — about 536 sections across 23 chapters, with plainer language and the redundant bits removed.
The government has been clear that the aim is simplification, not higher taxes. As the Finance Minister put it during the Union Budget 2026, the purpose is to make tax law easier to read and apply — not to increase what you pay.
What is actually changing for businesses?
Here are the changes that genuinely affect how you run your finances.
1. The "Tax Year" replaces "Previous Year" and "Assessment Year."
This is the change you will notice most. The old law made you juggle two terms — the "previous year" (when you earned the income) and the "assessment year" (when you filed and were assessed). The new Act merges both into a single "Tax Year." So income earned from 1 April 2026 to 31 March 2027 is simply Tax Year 2026-27. Cleaner, and closer to how the rest of the world works.
For a new business, the Tax Year begins on the day it is set up. Start a company on 1 December 2026, and its first Tax Year runs from 1 December 2026 to 31 March 2027.
2. TDS provisions are consolidated.
Under the old Act, TDS (tax deducted at source) was scattered across dozens of sub-sections, which made compliance messy. The new Act pulls these together into a tighter structure. Practically, your payroll and TDS software, forms, and section references all need updating from April 2026.
3. Tax forms get new numbers and a unified structure.
Many familiar forms — from PAN application forms to TDS certificates and annual tax statements — have been renamed and renumbered under the new Income-tax Rules, 2026. Your finance team and software need to reference the new forms for transactions from 1 April 2026.
4. The updated-return window is longer.
The window to file an updated return has been extended (from 24 months to 48 months from the end of the tax year), giving honest taxpayers more room to correct genuine mistakes.
What is NOT changing?
Just as important as what changed is what stayed the same:
- Tax rates and slabs — unchanged for both the old and new regimes.
- Deductions and exemptions — the familiar ones continue (the section numbers may differ).
- Penalties and offences — broadly the same.
- Past assessments — anything you legitimately claimed for FY 2025-26 and earlier stays valid. The new Act does not reach backwards.
Which Act applies to which year?
This is the most common point of confusion, so here it is clearly:
| Period | Which Act applies | Notes |
|---|---|---|
| Up to 31 March 2026 (FY 2025-26) | Income-tax Act, <strong>1961</strong> | File your ITR using old sections and old forms |
| From 1 April 2026 (Tax Year 2026-27) | Income-tax Act, <strong>2025</strong> | Use new sections and new forms |
| Pending assessments/appeals from old years | Income-tax Act, <strong>1961</strong> | Continue under the old Act until completed |
In short: for a while, you operate under both Acts at once — the old one for past years still being assessed, and the new one for current compliance.
What should business owners do before and after 1 April 2026?
1. Update your accounting and payroll software to the new section numbers and form names.
2. Train your finance team on the new "Tax Year" terminology so internal documents and client communication match.
3. Keep FY 2025-26 filings on the old framework — do not mix old and new form numbers.
4. Build clean transaction tracking from April 2026 rather than reconstructing at audit time.
5. Review your deductions to confirm the equivalent provisions under the new Act.
Frequently asked questions
When does the new Income-tax Act 2025 take effect?
It came into force on 1 April 2026 and applies to Tax Year 2026-27 and onwards.
Have tax rates changed under the new Act?
No. Tax rates, slabs, and regimes are unchanged. The reform is about simplifying the law, not raising taxes.
What is the "Tax Year" concept?
It merges the old "previous year" and "assessment year" into a single 12-month period running 1 April to 31 March. Income earned in that period is computed, taxed, and assessed under the same Tax Year label.
Which Act applies to FY 2025-26?
The old Income-tax Act, 1961. Income earned up to 31 March 2026 is filed under the old law and forms.
Do my old deductions still count?
Yes. Deductions and exemptions legitimately claimed for earlier years remain valid. The new Act does not reopen them.
Make the transition without the headache
The 2025 Act is a simplification, but the switch still touches your software, forms, payroll, and filing process. Impuesto helps business owners across Maharashtra move cleanly to the new framework — updating compliance processes, handling TDS and filings under the right Act, and keeping you penalty-free through the changeover.
*This article is for general information and reflects rules as of the publication date. For advice specific to your business, speak to a qualified professional.*