Income-tax Act, 2025: What Actually Changes for Individual Taxpayers

On 1 April 2026, the Income-tax Act, 1961 was replaced by the Income-tax Act, 2025. A law that governed Indian income tax for sixty-five years, and that had been amended by more than sixty Finance Acts along the way, is now history.

The reaction from most salaried taxpayers has been a mix of panic and confusion, and almost all of it is misplaced. This is a rewrite, not a new tax policy. The slabs did not change because of it, your deductions did not disappear, and nothing about the new Act makes the return you are filing right now any different.

What did change is the vocabulary, the section numbers, and the shape of the statute, and that matters enough in practice to get right.

First, the Only Question That Matters Right Now

Two tax laws are live at the same time, and which one applies depends entirely on which year's income you are dealing with.

So if you are filing or revising a return for FY 2025-26, or responding to a notice for any year up to and including FY 2025-26, the 1961 Act is your law. You claim Section 80C, not Section 123. You compute house property income under Section 24(b), not its replacement. The repeal and savings provisions of the new Act specifically preserve the old law for assessments, reassessments, appeals, penalties, and refunds relating to earlier years, so a 2029 appeal about FY 2024-25 will still be argued under the 1961 Act.

The new Act governs income you are earning in the financial year that began on 1 April 2026, which you will report in a return filed in 2027. That is the first return that will be drafted in the new language.

If you still have a pending return for FY 2025-26, the belated and revised return window closes on 31 December 2026, and it is filed under the old Act. Our guide to filing a belated return and the penalties involved covers that process.

The "Tax Year" Replaces "Previous Year" and "Assessment Year"

This is the single change you will notice most, because it affects every form, notice, and conversation going forward.

Under the 1961 Act, income earned between 1 April 2025 and 31 March 2026 was the previous year, and it was taxed in the assessment year 2026-27. Two labels for one stretch of income, offset by a year, and a reliable source of error for first-time filers who entered the wrong year on a challan and then spent months getting the credit moved.

The 2025 Act deletes both terms. There is now one concept, the tax year, defined as the twelve-month period of the financial year beginning 1 April. Income earned from 1 April 2026 to 31 March 2027 is simply tax year 2026-27. The year in which you file and the department assesses is described as the financial year succeeding the tax year, with no special name of its own.

For a business or source of income that comes into existence partway through the year, the tax year begins on the date the business is set up or the source first exists, and runs to the end of that financial year. This replaces the old proviso-heavy treatment of a first previous year.

Practically, this means challans, ITR forms, and intimations issued for FY 2026-27 onwards will ask for a tax year rather than an assessment year. If you are paying advance tax for the current year, check the label carefully before you submit, because paying into the wrong year is still the most common self-inflicted tax problem in India.

Your Deductions Did Not Change, But Their Section Numbers Did

The new Act consolidates the whole of the old Chapter VI-A into sections 122 to 154. The amounts, the eligibility conditions, and the limits were carried over substantially as they were. What moved is the numbering.

The ₹1.5 lakh ceiling under what used to be 80C is intact. So are the ₹25,000 and ₹50,000 limits for health insurance, the ₹2 lakh cap on self-occupied home loan interest, and the 30% standard deduction on net annual value of a let-out property. If you were claiming ₹1,50,000 of PPF and ELSS under 80C for FY 2025-26, you will claim the same ₹1,50,000 under section 123 for FY 2026-27.

Our Section 80C deductions guide remains accurate on substance. Only the number on the form is new.

The one habit worth breaking is the shorthand. "80C" has been a household term in India for three decades, and people will keep saying it for years. That is fine in conversation, but when you write to the department about a tax year from 2026-27 onwards, cite the section of the Act that actually applies to that year.

What the Rewrite Was Actually For

The 1961 Act had grown to roughly 800 pages, with sub-clauses several layers deep, explanations attached to provisos, and provisions that had been dead letters for decades but were never removed. The 2025 Act is organised into 536 sections across 23 chapters and 16 schedules, in about half the word count. The drafting changes that matter to a reader are structural:

Tables instead of prose. TDS rates, slab rates, and perquisite valuations now sit in tabular form, so finding the rate for a payment means reading a row rather than parsing a clause.

Formulae instead of narrative arithmetic. Computations the old Act described in words, which forced you to translate English into arithmetic and hope you had the order of operations right, are now written as formulae.

Fewer provisos, and no dead letters. Conditions buried in provisos have largely been pulled up into the body of the section or moved into a schedule, and provisions referring to expired incentive windows were dropped rather than carried forward as clutter.

None of this changes anyone's tax liability. It changes how long it takes to establish what your liability is, which matters more than it sounds when you are reading a notice and trying to work out what the officer is actually relying on.

Rates and Slabs Come From the Finance Act, Not This One

A common misconception is that the new Act set new tax rates. It did not, and structurally it could not.

Rates of income tax in India are prescribed every year by the Finance Act that follows the Union Budget, not by the Income-tax Act itself. The 2025 Act is the machinery: who is taxable, on what, with what deductions, under what procedure. The rate card for a given year still arrives each February.

So the new regime slab structure that applied to FY 2025-26, with nil tax up to ₹4 lakh, the ₹75,000 standard deduction for salaried taxpayers, and the Section 87A rebate taking effective tax to zero up to ₹12 lakh of normal income, came from the Finance Act, 2025. Our Union Budget 2025 tax changes explainer covers that in detail, and it remains the law for the return you file for AY 2026-27.

Equally, the choice between the old and new regime, the opt-out mechanism, and capital gains rates are policy matters that continue to be set and amended through annual Finance Acts. The comparison in our old vs new tax regime guide is unaffected by the rewrite.

What Does Not Change at All

It is worth being explicit, because a lot of worry has attached to things that were never in play.

• Your PAN, Aadhaar linkage, and portal login are unchanged.
• The e-filing portal, AIS, TIS, and Form 26AS continue exactly as before.
• Form 16 from your employer continues in the same shape, with the same quarterly TDS machinery behind it.
• ITR-1 and ITR-2 continue to exist as forms, with the same basic eligibility logic about who can use which.
• Residential status still turns on day counts in India, and the 182-day and 60-day plus 365-day tests carry over.
• Capital gains remain split into short term and long term by holding period, with the same asset-class treatment.

The filing experience for a salaried taxpayer in 2027 will look very much like the filing experience in 2026. 49Tax reads your Form 16, AIS, and capital gains statements and maps them to the correct schedule and section for the year in question, so the renumbering is handled behind the scenes rather than being something you have to track.

Three Things Worth Doing Before Next Filing Season

Check the year label on every payment you make from now on. If you pay self-assessment or advance tax for income earned after 1 April 2026, the challan relates to tax year 2026-27. A misapplied challan is recoverable, but it costs weeks.

Do not update your old records to new section numbers. Your FY 2025-26 computation sheet should say 80C, because that is the law that governed it. Retroactively relabelling your own papers creates a mismatch between what you filed and what you hold, which is the last thing you want if a notice arrives three years later.

Treat advice that cites the wrong Act for the wrong year as a red flag. A good deal of commentary published in 2026 is sloppy about this, and some of it will tell you to claim section 123 on a return for FY 2025-26. That is simply wrong.

Actionable Takeaway

For anything relating to FY 2025-26 and earlier, including the belated return due by 31 December 2026, use the 1961 Act and its familiar section numbers. From FY 2026-27 income onwards, the Income-tax Act, 2025 applies, "tax year" replaces "assessment year", and Chapter VI-A deductions carry new numbers between 122 and 154 at identical limits. Nothing about your actual tax bill changed on 1 April 2026, so if a piece of advice claims the new Act raised or lowered your liability, check whether it is really describing a Finance Act change instead.