The New Income-tax Act, 2025 Takes Effect: What Changes for Small Businesses

On 1 April 2026 the Income-tax Act, 2025 replaces the 1961 Act — the first full rewrite of India's direct tax law in over six decades. The government has been clear it is a simplification, not a tax hike: rates do not change. But the plumbing every small business touches — section numbers, form names, return formats, deadlines and the basic vocabulary of the law — does change (Income Tax Department). Here is what actually shifts for you, and what to do before the next filing season.

What changed and what stayed the same?

The big idea: no new tax. The Act, 2025 keeps the core charging principles, slabs and the new-regime structure intact, and rewrites the language to make it shorter and clearer (ClearTax). What moves is the scaffolding around compliance — and that scaffolding is exactly what your accountant, payroll software and TDS process run on.

Crucially, the change is dated, not retroactive. For FY 2025-26 (AY 2026-27) you still file under the old 1961 Act. Income from FY 2026-27 onward is governed by the 2025 Act. So your upcoming return for last year's income uses the old rules; the new rules bite for the year that has just begun.

What is the new "Tax Year" concept?

The 2025 Act scraps the old "Previous Year" and "Assessment Year" pair and replaces both with a single Tax Year (ETV Bharat). Income earned in 2026-27 is simply Tax Year 2026-27 — no more explaining to a client why their FY 2024-25 income is "AY 2025-26".

For a new business there is a specific rule: the first Tax Year runs from the date the business is set up to the end of that financial year. Start a firm on 1 December 2026 and its first Tax Year is 1 December 2026 to 31 March 2027. Cleaner to explain, but your invoicing and accounting templates that hardcode "AY" need updating.

Which deadlines and TDS rules shift?

TDS rates do not change, but from 1 April 2026 the section codes, form names, return formats and payment codes all move to the new framework (CompuTax). One transition trap: Q4 FY 2025-26 TDS returns (up to 31 March 2026) must still be filed under the old Form 24Q/26Q and old section numbers — do not switch form numbers early.

Two relief points and one tightening for small businesses. The ITR-3 and ITR-4 due date for non-audit cases moves from 31 July to 31 August, and the window to file a revised return extends from 9 to 12 months after the tax year. The tightening: a clarified rule treats manpower-supply contracts as "work" (old Section 194C, now Section 393), so if you weren't deducting TDS on labour-deployment vendors, fix that from April 2026.

The cash-transaction penalty you can't ignore

The 2025 Act keeps a sharp edge on cash: any cash loan or deposit above ₹20,000 can attract a penalty equal to 100% of the amount (FutureX). A ₹50,000 cash loan can mean a ₹50,000 fine. For shops and small firms used to settling sums in cash with suppliers, partners or family, this is the rule most likely to cause an expensive surprise. Route anything above ₹20,000 through bank or UPI.

Your April-2026 checklist

• Update software — payroll, TDS and accounting tools must reference the new Tax Year and new section/form codes.
• Fix Q4 returns — file FY 2025-26 Q4 TDS under old forms; switch to new forms only from FY 2026-27.
• Audit manpower contracts — start deducting TDS on labour-supply vendors under Section 393.
• Kill ₹20,000+ cash — move supplier, partner and loan settlements to bank/UPI.
• Document startup valuations — angel-tax safe-harbour rules are restructured; keep FMV workings before any post-April-2026 raise.

The official Act, transition FAQs and an old-vs-new comparison utility live on incometax.gov.in. If you'd rather not track section renumbering yourself, our finance team handles business ITR and TDS filing under the new Act, and you can talk to us about a clean April-2026 transition.

Related reading: the FY 2025-26 TDS and TCS threshold changes and the 2026 tax compliance calendar.