ITR Filing 2026: Two Deadlines Now, and One Costly Trap

If you have filed your income tax return the same way every July, 2026 has a small surprise waiting. The ITR filing 2026 season for assessment year AY 2026-27 (financial year 2025-26) no longer hands everyone a single July deadline. The Central Board of Direct Taxes has split it, and there's a quieter rule about choosing your tax regime that can quietly cost you money if you file even a day late.

The forms were notified on 30 March 2026, and the online utilities for ITR-1 through ITR-4 are already live on the e-filing portal. So there is no reason to wait. Here is what actually changed, what the two regimes look like now, and the exact order in which to do this.

Two deadlines, not one

For years, almost every individual who didn't need an audit filed by 31 July. This year the dates depend on which form you use.

• 31 July 2026 — ITR-1 and ITR-2 filers. This covers most salaried people, pensioners, and those with capital gains or income from house property.
• 31 August 2026 — ITR-3 and ITR-4 filers in non-audit cases. This is for business income, professional income (think consultants, freelancers, doctors, shopkeepers) and presumptive-tax cases.
• 31 October 2026 — taxpayers whose accounts need a tax audit.
• 30 November 2026 — those with transfer pricing obligations.

The practical takeaway: if you're a salaried employee, your clock runs out at the end of July, not August. The extra month belongs only to the business and professional crowd. Don't read "31 August" in a headline and assume it applies to you.

The new regime is the default — and that matters

Unless you actively opt out, your return is computed under the new tax regime (Section 115BAC). This is the structure most people will, and arguably should, use. After the rebate enhancement that carried over from Budget 2025 and stayed untouched in Budget 2026, the maths is hard to argue with.

The new regime slabs for FY 2025-26 run like this:

• Up to ₹4 lakh — nil
• ₹4 lakh to ₹8 lakh — 5%
• ₹8 lakh to ₹12 lakh — 10%
• ₹12 lakh to ₹16 lakh — 15%
• ₹16 lakh to ₹20 lakh — 20%
• ₹20 lakh to ₹24 lakh — 25%
• Above ₹24 lakh — 30%

The number that does the heavy lifting is the Section 87A rebate, now worth up to ₹60,000. It wipes out the tax entirely for resident individuals with taxable income up to ₹12 lakh. Add the ₹75,000 standard deduction available to salaried taxpayers, and a salaried person earning up to roughly ₹12.75 lakh can legally pay zero tax without buying a single tax-saving product.

The trade-off is that the new regime strips out more than 70 deductions and exemptions. No 80C for your PPF and ELSS, no 80D for health insurance, no HRA, no LTA, no home-loan interest relief on a self-occupied house. You get a clean, low-rate structure in exchange for giving up the deduction maze.

When the old regime still wins

The old tax regime isn't dead. It keeps the familiar basic exemption of ₹2.5 lakh, the ₹50,000 standard deduction, and the full toolkit of deductions. Its rebate, though, only takes tax to zero up to ₹5 lakh of taxable income, and its slabs climb faster.

So the old regime pays off only when your deductions are genuinely large. Run a quick test before you decide:

1. Add up your real, claimable deductions — 80C (up to ₹1.5 lakh), 80D health premiums, HRA actually paid, home-loan interest up to ₹2 lakh, NPS under 80CCD(1B), and so on.
2. If that total is modest, the new regime almost certainly leaves you with less tax and zero paperwork.
3. If you have a hefty home loan plus high rent plus maxed-out 80C and 80D, sit down with a calculator (the income tax portal has one) and compare both numbers side by side.

There's also a quiet edge for very high earners: the maximum surcharge is capped at 25% under the new regime, against 37% under the old one. For income running into crores, that cap alone can tilt the decision.

The regime trap hiding in the deadline

Here's the rule most people don't notice until it's too late. If you miss your due date and file a belated return, you cannot use the old regime. A late return can only be filed under the new regime, full stop.

So if you rely on heavy deductions and the old regime genuinely saves you money, filing on time isn't just good housekeeping — it's the only way to keep that choice alive. Cross the deadline and the door to the old regime shuts for that year.

How you opt out also depends on your income type. If you have only salary, pension, capital gains or house-property income, you simply tick the "opting out of new regime" box inside the ITR form. But if you have business or professional income (ITR-3 or ITR-4), you must file Form 10-IEA before your due date to choose the old regime — and for business income, that switch is generally a once-in-a-lifetime move. Get the form in before 31 August, or the option lapses.

What it costs to be late

Missing the deadline doesn't mean you can never file. You can submit a belated return up to 31 December 2026, but it carries a price:

• Late fee under Section 234F: ₹5,000 if your total income exceeds ₹5 lakh, or ₹1,000 if it's within ₹5 lakh.
• Interest under Section 234A: 1% per month on any unpaid tax.
• Lost carry-forward: you generally cannot carry most losses forward to set off against future income.

If you spot a genuine mistake after filing, a revised return can be filed up to 31 March 2027. And if you missed everything, an updated return (ITR-U) is allowed for up to four years from the end of the assessment year — but with extra tax on top, it's a last resort, not a plan.

The steps, in order

Filing is genuinely a 30-minute job for most salaried people once your documents are ready.

1. Gather the basics: Form 16 from your employer, Form 26AS and the Annual Information Statement (AIS) from the portal, interest certificates from banks, and capital-gains statements from your broker or mutual fund.
2. Reconcile first: match the income and TDS in your AIS against your own records. Mismatches are the single biggest reason returns get flagged later.
3. Pick the right form: ITR-1 for simple salary and one-house cases, ITR-2 if you have capital gains or multiple properties, ITR-3/ITR-4 for business and professional income.
4. Compare regimes: use the portal's tax calculator with your actual deductions before you commit. Decide deliberately, don't default by accident.
5. File and pay: clear any balance tax, submit, and don't skip the last step.
6. E-verify within 30 days: an unverified return is treated as not filed. Aadhaar OTP is the quickest route; net banking and a few other options also work.

Budget 2026 left the slabs unchanged, so the structure you learn this year carries forward. The one habit worth building is simple: file before your date, choose your regime on purpose, and verify the same day. The rest is just paperwork.