ITR Late Filing Penalty Calculator — AY 2026-27 (FY 2025-26)

Income Tax Calculator (India FY 2025-26)

ITR Deadlines for AY 2026-27: The New Staggered Calendar

For income earned in FY 2025-26, the filing calendar is staggered by return form for the first time. Salaried taxpayers and others filing ITR-1 or ITR-2 must file by 31 July 2026. Non-audit taxpayers with business or professional income filing ITR-3 or ITR-4 get until 31 August 2026 — a permanent statutory change made by the Finance Act, 2026 through an amendment to section 139(1) of the Income-tax Act, 1961, not a one-off extension. Taxpayers whose accounts require audit under section 44AB have until 31 October 2026, and transfer-pricing cases covered by section 92E retain the later 30 November 2026 date, consistent with prior years. As of mid-July 2026, the CBDT has announced no blanket extension for AY 2026-27, and the department has said the 31 July date stands — unlike AY 2025-26, when the deadline slipped to September. Treat any extension rumour as unconfirmed until a CBDT circular appears on incometax.gov.in, and verify before filing. Note that your deadline follows the form you are required to file, not the one you prefer: a salaried taxpayer with F&O trading income typically needs ITR-3, which moves the due date to 31 August but may also trigger audit questions if turnover is large.

The Late Fee Explained: Section 234F Today, Section 428 Under the New Act

Miss your due date and section 234F of the Income-tax Act, 1961 levies a flat fee of ₹5,000, reduced to ₹1,000 where total income does not exceed ₹5 lakh. It is a fee, not a discretionary penalty — the e-filing portal collects it automatically with your self-assessment tax under section 140A, and it applies even when you owe zero tax, so long as your total income exceeds the basic exemption limit (₹4 lakh under the default new regime for FY 2025-26; ₹2.5 lakh under the old regime, per current guidance). No fee applies if your income is below that limit and you are filing voluntarily. The section-number mapping matters this year because the Income-tax Act, 2025 came into force on 1 April 2026 and applies from tax year 2026-27 onwards. Your AY 2026-27 return — covering FY 2025-26 income — is still governed by the 1961 Act's numbering, so 234F is the section you will see on this year's computation. From next filing season, the same ₹1,000/₹5,000 fee lives in section 428 of the 2025 Act, which also widens the provision to cover late audit reports. Budget 2026 additionally introduced section 234I, a mirror-image fee for revised returns filed between 1 January and 31 March 2027 — verify the fine print before relying on that window.

Interest Under Sections 234A, 234B and 234C: Worked Example

The 234F fee is only the visible cost; interest usually hurts more. Section 234A charges 1% simple interest per month or part month on unpaid tax, from the day after your due date to the day you file. Section 234B charges 1% per month from 1 April 2026 if you paid less than 90% of your assessed tax as advance tax, and section 234C charges 1% for fixed periods on shortfalls in the quarterly advance-tax instalments (15%, 45%, 75%, 100% cumulative). Under the Income-tax Act, 2025 these become sections 423, 424 and 425 respectively, with the same 1% mechanics. Worked example: Rohan owes ₹1,20,000 in self-assessment tax, his due date was 31 July 2026, and he files on 31 October 2026 — three months late (a part month counts as a full month). Section 234A interest: ₹1,20,000 × 1% × 3 = ₹3,600. Add the ₹5,000 section 234F fee (income above ₹5 lakh) and his delay costs ₹8,600. If that ₹1,20,000 should have been paid as advance tax, section 234B also runs from April to October 2026: ₹1,20,000 × 1% × 7 = ₹8,400, lifting the bill to about ₹17,000 before any section 234C instalment interest — roughly 14% of the tax itself, lost to avoidable delay.

Belated vs Revised vs Updated Return: Your Options After the Deadline

Missing the due date does not mean missing the year. A belated return under section 139(4) can be filed up to 31 December 2026 for AY 2026-27 — you pay the section 234F fee and any 234A interest, but the return is otherwise valid and you can still claim your refund. If you filed on time but made a mistake, a revised return under section 139(5) fixes it; per Budget 2026 amendments, the revision window for AY 2026-27 now runs to 31 March 2027, though revisions filed between 1 January and 31 March 2027 attract the new section 234I fee of ₹1,000 (income up to ₹5 lakh) or ₹5,000 — verify current rules before using the extended window. After 31 December, your only route is the updated return (ITR-U) under section 139(8A), available for 48 months from the end of the assessment year — until 31 March 2031 for AY 2026-27. ITR-U is expensive by design: on top of tax and interest you pay additional tax of 25% if filed within 12 months, 50% within 24 months, and per current guidance 60% and 70% in the third and fourth years. ITR-U also cannot be used to claim or increase a refund, so a belated return by 31 December is almost always the cheaper correction.

What You Lose by Filing Late (Beyond the Fee)

The hidden costs of a belated return often exceed the ₹5,000 fee. First, loss carry-forwards vanish: under section 80 read with section 139(3), business losses, capital losses and speculation losses can only be carried forward if the return is filed by the original due date. A trader with a ₹3 lakh short-term capital loss who files belated loses the right to set it off against future gains — at 20% (present short-term rate on listed equity, per current guidance), that is up to ₹60,000 of future tax relief surrendered. Only house-property losses and unabsorbed depreciation under section 32(2) survive late filing. Second, refund interest shrinks: section 244A pays 0.5% per month on refunds, but when you file late the clock starts from your filing date instead of 1 April 2026, so a three-month delay on a ₹1 lakh refund forfeits about ₹1,500. Third, regime choice narrows: the new regime under section 115BAC is the default, and the option to elect the old regime (with its 80C, 80D and HRA deductions) is generally available only in a return filed by the section 139(1) due date — a belated filer with large deductions can face a materially higher bill. Persistent non-filing can also attract prosecution under section 276CC in serious cases.

How to Avoid the Penalty: File-Now Checklist

Everything above is avoidable with a week of preparation. First, reconcile your documents: download Form 26AS and the Annual Information Statement (AIS) from the e-filing portal and match them against Form 16, bank interest certificates and broker statements — mismatches are the top cause of notices, and AIS data for FY 2025-26 is already populated. Second, pick the correct form, because it sets your deadline: ITR-1/ITR-2 filers face 31 July 2026, while ITR-3/ITR-4 filers have until 31 August 2026. Third, compute and pay self-assessment tax immediately even if you need more time to file — 234A-family interest accrues on the unpaid amount, so clearing the tax first caps the meter, and courts have long held interest should not run on tax already paid. Fourth, e-verify within 30 days of submission via Aadhaar OTP or net banking; an unverified return is treated as never filed, which silently converts an on-time filing into a belated one. Fifth, pre-validate your bank account so any refund (with full section 244A interest) lands without manual follow-up. Finally, if an extension is announced, rely only on a CBDT circular or the incometax.gov.in news page — verify before filing decisions, and never plan around rumoured dates.