Summary of this article
Two benefits do not survive a missed deadline and cannot be recovered through any later filing.
Section 139(4) Income Tax Act 1961 return may be filed up until 31 December 2026. It will be similar to filing your original return.
After December 31, 2026, the only route is ITR-U under Section 139(8A), available until March 31, 2031 for AY 2026-27.
Missing the July 31 deadline isn't the end of the world - you can file a late return any time until December 31, 2026. However, filing late comes with a cost: You lose certain tax benefits, you'll owe a late fee plus interest, and your tax return will only grow more expensive if you wait until after December.
What You Have Already Lost
Two benefits do not survive a missed deadline and cannot be recovered through any later filing.
For instance, capital losses from equity, debt funds, or property booked in FY 2025-26 cannot be carried forward. Business losses and F&O trading losses face the same restriction. A taxpayer who booked Rs 3 lakh in equity losses this year and files late, loses the ability to offset those losses against future gains for the next eight years.
Says CA Parag Jain, Tax Head at 1 Finance: “Also, the Old Tax Regime is locked out for the year. A belated return is automatically assessed under the new regime. Interest on home loans under Section 24(b), HRA, and Section 80C deductions apart from the basic deduction are not available irrespective of the savings in each of these cases.”
What You May Still Do
Section 139(4) Income Tax Act 1961 return may be filed up until 31 December 2026. It will be similar to filing your original return. Just login to your e-filing portal, choose the right ITR form, go to Section 139(4) of the Return Filing Section, fill the income details, pay all outstanding tax, and e-verify in 30 days.
Adds Jain: “Two costs apply. A late fee under Section 234F of Rs 1,000 for income below Rs 5 lakh and Rs 5,000 for everyone else. And interest under Section 234A at 1 per cent per month on unpaid tax, running from August 1, not from the filing date. Five months of delay means five months of compounding interest on top of the late fee.”
Most deductions remain claimable. Section 80C, 80D, HRA, standard deduction, and capital gains exemptions under Sections 54 and 54F are all available. Refunds may be claimed. Credit for TDS remains unaffected. House property loss can still be carried forward for up to eight years.
If December 31 Passes Without A Return
After December 31, 2026, the only route is ITR-U under Section 139(8A), available until March 31, 2031 for AY 2026-27. The cost is steep. An additional 25 per cent on top of tax and interest owed within 24 months, rising to 50 per cent beyond that. ITR-U will not be able to make any claim for refunds, reduce income declared or increase the loss declared by you. The refund to which you were entitled till 31 December cannot be claimed by you after that date via ITR-U.
“Not filing at all involves the most serious risk. Where tax payable exceeds Rs 10,000 and no return is filed by March 31, 2027, the Assessing Officer can initiate prosecution under Section 276CC, with penalties including imprisonment of three months to seven years. Filing a belated return by December 31 removes this risk entirely,” says Jain.
Before You File
Check Annual Information Statement (AIS) first. Every ITR figure is matched against what the department already holds from banks, employers, and registrars. Catching a mismatch before submission is far simpler than resolving it after a notice arrives.
Make all payments due before filing your return. This means payment of all outstanding taxes, section 234A interest, and the Section 234F penalty. Pre-validate the bank account if a refund is expected. E-verify within 30 days of submission. A filed but unverified return is treated as if it was never submitted.
December 31 is the last chance to set this right without paying significantly more for the privilege.
