The New Income-tax Act, 2025 Is Now in Force: What Actually Changes for You From April 2026

In short: On 1 April 2026, the Income-tax Act, 2025 replaced the Income-tax Act, 1961, the law that governed Indian income tax for over six decades. Passed by Parliament in August 2025, the new Act is a simplification exercise, not a rate change: your slabs, regimes and rebates are untouched. What changes is the machinery, a single "tax year" replaces the confusing previous-year/assessment-year pair, the law shrinks from over 800 sections to 536, you get four years instead of two to file an updated return, and the familiar forms are being renumbered. One genuinely money-relevant change for this city: under the rules notified with the new framework, Hyderabad now qualifies for the 50% metro HRA exemption.

What Happened and Why

The Income-tax Act, 1961 had been amended by more than sixty Finance Acts, leaving a statute of over 800 sections, dense cross-references and language only professionals could navigate. The Income-tax Act, 2025 rewrites the same law in plain language: roughly 536 sections, logically sequenced chapters, tables and formulas in place of provisos, and redundant provisions removed.

The key word is continuity. The government has been explicit that this is a re-enactment, not a policy overhaul: existing tax positions, ongoing assessments and settled interpretations broadly carry forward. If you were compliant on 31 March 2026, nothing about the new Act made you non-compliant on 1 April.

What Does NOT Change: Slabs, Regimes, Rebates

Because this matters most, first the list of things that stay exactly as they were:

• Tax slabs and rates: The new-regime slabs (nil up to ₹4 lakh, rising to 30% above ₹24 lakh) and the old-regime slabs continue unchanged. Budget 2026-27 made no changes either.
• The two-regime choice: The new regime remains the default; you can still opt for the old regime with its deductions.
• Section 87A rebate: Up to ₹60,000 under the new regime, keeping income up to ₹12 lakh effectively tax-free, ₹12.75 lakh for salaried taxpayers after the ₹75,000 standard deduction.
• Deduction limits: 80C-equivalent (₹1.5 lakh), home loan interest (₹2 lakh), 80D health premiums and the rest survive under new section numbers, with the same monetary limits.

For a full comparison of the two regimes with worked examples, see our guide on new vs old tax regime.

Goodbye Assessment Year: The New "Tax Year"

The most visible change is vocabulary. The 1961 Act taxed the income of a "previous year" in an "assessment year", a two-label system that confused almost every non-professional who ever filed a return (income earned in FY2025-26 was assessed in AY2026-27). The new Act collapses this into a single tax year: the twelve months from 1 April to 31 March in which the income is earned. Forms, notices and challans now reference just one year, which alone should eliminate one of the most common filing errors, picking the wrong year in the dropdown.

Four Years to File an Updated Return

If you discover an omission after filing, missed interest income, a forgotten capital gain, a wrong deduction claim, the updated-return (ITR-U) window now runs to four years, up from the earlier two. You still pay additional tax for the privilege, and the cost rises the later you correct, so this is a safety net rather than a strategy. But it means an honest mistake found in year three no longer has to wait for a notice to be fixed.

The Hyderabad Win: 50% HRA Exemption

Under the 1961-era rules, only four cities, Delhi, Mumbai, Kolkata and Chennai, counted as "metro" for HRA, capping the exemption for everyone else at 40% of basic salary. The rules notified under the new framework extend the 50% HRA exemption to Hyderabad, Bengaluru, Pune and Ahmedabad, finally recognising what rents in these cities have looked like for a decade.

Two caveats. First, HRA exemption is an old-regime benefit; if you are on the default new regime, this does not change your tax. Second, the exemption is still the least of three amounts (actual HRA received; rent paid minus 10% of basic; 50% of basic), so the benefit lands on renters whose HRA and rent are both substantial. If you rent in Hyderabad, pay meaningful HRA-covered rent, and were near the old-vs-new breakeven, this change is a reason to re-run your regime comparison, it makes the old regime a little stronger for high-rent tenants.

New Forms and Filing Changes

From April 2026, several familiar forms are being replaced with new numbers and consolidated formats as the department migrates to the new Act's structure. Certificates, statements and challans reference the new section numbers, so a TDS certificate that once cited Section 194C will cite its successor provision. Nothing here needs action from most salaried taxpayers beyond one habit: when downloading or verifying forms this year, check you are on the current version rather than a cached 1961-era format, and expect employer payroll teams and the e-filing portal to reflect the new numbering through the year.

What You Should Do Before Filing

• Nothing drastic. Rates and limits are unchanged; your tax planning from last year remains valid.
• Re-run the regime comparison if you rent in Hyderabad with substantial HRA, the 50% metro rate may shift your breakeven toward the old regime.
• Use the single tax-year label when filing, and double-check any pre-filled data against Form 16 and AIS as the portal transitions.
• Note the four-year ITR-U window if you have an old omission you have been meaning to correct, earlier is cheaper.
• Keep documentation habits intact: rent receipts, premium receipts and investment proofs matter exactly as much under the new Act as the old one.

The 2025 Act is the rare tax change that asks little of you while making the law easier to read. The planning decisions that actually move your tax bill, regime choice, deductions, capital gains timing, are the same ones as before, just written in cleaner language.

Frequently Asked Questions