Income-tax Act 2025: What Changes for Taxpayers from April 2026

From 1 April 2026 — the start of FY2026-27 — the Income-tax Act, 2025 replaces the Income-tax Act, 1961, which had governed Indian income tax for over six decades. This is a genuinely significant legal transition: an entirely new statute, with its own section numbering and structure, takes over the job the 1961 Act had done since before most of today's taxpayers were born.

It is natural to assume a change this large means new tax rates, new deduction limits, or new rules about what you owe. It does not — at least not by itself. The 2025 Act is best understood as a restructuring and simplification of the law's language and organization, not a rewrite of how much tax anyone pays.

It helps to separate two things that get announced around the same time but come from completely different processes. Tax rates, slabs, deduction limits and rebate thresholds are set every year by the Finance Act, presented as part of the Union Budget — the figures for FY2026-27 that this site's guides describe throughout come from Budget 2025 and Budget 2026, not from the Income-tax Act, 2025.

The Income-tax Act, 2025, by contrast, is the underlying framework law — it defines how income is classified, how the tax machinery operates, how sections are organized and numbered, and what terminology is used. Budget-driven numbers like slab rates and deduction caps sit on top of this framework and continue to be revised separately, exactly as they always were under the 1961 Act.

In short: the rulebook's chapters have been reorganized and relabelled, but the numbers written into this year's edition of the rulebook — via the Finance Act — are unchanged by that reorganization.

One of the most visible changes is terminology. Under the 1961 Act, income earned in a Financial Year (say, FY2025-26) was formally assessed in the following Assessment Year (AY2026-27) — a two-name system that confused a huge number of taxpayers who could never quite remember which year's tax return matched which year's income.

The Income-tax Act, 2025 does away with this by introducing "Tax Year" — a single term for the year in which income is earned, which is also the year it is taxed and assessed under. There is no separate forward-shifted assessment label to keep track of. Wherever older material referred to an Assessment Year, the equivalent going forward is simply the Tax Year that matches the income itself.

The renumbering that will affect ordinary taxpayers most directly is the one everyone already knows by name: Section 80C, the most widely used deduction section in Indian tax law, is now Section 123 under the Income-tax Act, 2025. The ₹1,50,000 annual limit and the list of eligible instruments — PPF, ELSS, EPF, life insurance premiums, and the rest — are entirely unchanged; only the section label has moved.

This kind of renumbering runs throughout the new Act, not just for Section 80C. Because the site and most financial commentary will keep using the familiar old names for a long time — the way people still say "Section 80C" out of habit — our guides continue to refer to sections by their well-known 1961 Act numbers, with a note pointing to the corresponding Income-tax Act, 2025 numbering where it is useful to know.

The practical takeaway is simple: do not assume a new section number means a new rule. Before treating any renumbered section as a substantive change, check whether the underlying limit, eligibility, or rate actually moved — in the vast majority of cases covered on this site, it has not.

Beyond terminology and numbering, the Income-tax Act, 2025 is also organized differently. The 1961 Act had grown, over sixty years of amendments, into dense prose full of cross-references, provisos and explanations layered on top of one another — a structure that made even simple provisions hard to read without expert help.

The 2025 Act is reorganized to be shorter overall, and leans much more heavily on tables to present things like deduction limits, thresholds and rate structures — the kind of information that is genuinely easier to scan in tabular form than buried inside paragraphs of legal prose. The goal, as stated by the government during its drafting, was readability and simplicity rather than any change in tax policy itself.

If you already understand how your salary, deductions, and regime choice work under the rules described elsewhere on this site — standard deduction, Section 80C/123, HRA, home loan interest, the 87A rebate, and so on — none of that planning needs to change because of this Act. The limits, eligibility conditions and computation logic behind every figure on this site remain exactly what they were, just housed inside a differently organized and renamed law.

Every calculator on SmartDaddy — the Income Tax Calculator, HRA Calculator, and Deduction Gap Planner among them — is already built to reflect the Income-tax Act, 2025 and the Tax Year terminology where relevant, so you do not need to translate anything yourself when using them.

A transition of this size, affecting a law as foundational as the Income-tax Act, usually brings a steady stream of clarifications, circulars and procedural notifications in its first year, even when the underlying rules do not change. Filing utilities, form layouts, and departmental references to old versus new terminology can all take time to settle fully into the new framework.

It is worth bookmarking this guide and checking back over the course of FY2026-27, since we will update it as more clarity emerges from the tax department. In the meantime, treat any claim of an actual rate or limit change tied to this Act with caution — cross-check it against the Finance Act figures used throughout this site's guides, or verify it with our Income Tax Calculator.

A quick summary of what changed structurally, and what stayed the same.