Updated on 8 Nov 2026
You find a tax reminder under a pile of invoices and realise you never finished the return. Before choosing the first “late filing” option you see, pause. Which income period did you miss, and has your own category’s deadline actually passed?
The answer matters particularly in November 2026. The Income-tax Act, 2025 is now in force, but a return for income earned before April 2026 can still correctly belong to the saved 1961 Act.
Old law vs new law: Current Tax Year 2026–27 means income earned 1 April 2026–31 March 2027 under the 2025 Act. FY 2025–26 / AY 2026–27 remains governed by the saved 1961 Act. Do not assign a new-law section or form solely because you file after 1 April 2026.
Current new-law map: know the route before the deadline
| Task | Income-tax Act, 2025 reference |
|---|---|
| Ordinary return obligation | Section 263(1) |
| Belated return framework | Section 263(4) |
| Revising a return | Section 263(5) |
| Conditional updated return | Section 263(6) |
| Updated-return form | ITR-UN, Rule 165 |
| Updated-return additional tax | Section 267 |
| Late income-return fee | Section 428 |
The current ordinary full Tax Year has not yet ended. Use this map for current recordkeeping and the applicable future return; do not announce a missed annual filing deadline for the unfinished year.
UNCONFIRMED: an exact Tax Year 2026–27 operational utility-launch date and any reader-specific extension are not certified here. Prescribed forms and live deployment are separate facts.
Under Section 202(4) and Rule 136, the current regime option or withdrawal is linked to the Section 263(1) return. Do not assume a late route permits every election or automatically import old Form 10-IEA into the new framework.
Filing now for AY 2026–27: saved old law
The following practical dates concern FY 2025–26 income under the 1961 Act, not current Tax Year 2026–27.
First establish the original deadline for your category and any applicable notification. The Finance Act, 2026 distinguishes ordinary non-business individuals, non-audit business cases, audit/company cases and transfer-pricing cases. An extension for one category is not blanket relief for everyone.
A previously asserted audit extension to 21 November is UNCONFIRMED in this revision and is not relied upon. Check the actual CBDT notice before declaring your return late.
If no return was filed: old Section 139(4)
For AY 2026–27, a belated return may generally be filed by 31 December 2026, or before completion of assessment if earlier.
Old Section 234F ordinarily provides a ₹5,000 late fee where applicable, reduced to ₹1,000 if total income does not exceed ₹5 lakh. Old Section 234A can add interest on the relevant unpaid tax. Compute the applicable base and period; the fee is not the whole cost.
Timely-return conditions can restrict carry-forward of specified losses and regime choices. Do not make the blanket claim that every late filer is “stuck” in one regime: business cases may involve prior valid elections and different conditions.
If a filed return is wrong: old Section 139(5)
The enacted Finance Act, 2026 permits AY 2026–27 revision before the end of the assessment year—31 March 2027—or completion of assessment, whichever is earlier.
Under new old-law Section 234-I, a revision furnished after nine months from the end of the previous year attracts ₹1,000 if total income does not exceed ₹5 lakh, otherwise ₹5,000. For this AY, the late-revision fee period begins after 31 December 2026.
A revised return is a correction of an already furnished return. It is not the same as filing the first belated return after that first-return window has closed.
TaxQue tip: Keep the original acknowledgement, corrected computation and explanation of each change together. Filing another return is not helpful if you cannot show which earlier return it corrects.
When ordinary windows close: old ITR-U or another remedy
Old Section 139(8A) provides a conditional updated-return framework extending up to 48 months from the end of the relevant AY. It can involve additional tax and is not a way to reduce liability or claim/increase a refund.
Do not treat the earliest 25% additional-tax band as universal. Timing, notices and statutory exclusions matter. The new-law ITR-UN is a distinct designation; an older year must use its applicable saved-law form and process.
For qualifying hardship involving delayed refund or loss claims, old Section 119(2)(b) condonation may be relevant under the applicable CBDT procedure. Approval is not automatic. Rectification likewise concerns qualifying mistakes apparent from the record, not every missed deduction.
Worked example: isolate the fee and interest
Assume Sunita’s old-law AY 2026–27 original due date was 31 July 2026, total income exceeds ₹5 lakh and her correctly computed unpaid tax base for Section 234A is ₹12,000. Assume no extension or other adjustments.
If she files a belated return and pays that tax on 20 November 2026, the illustration counts four months or parts: August through November. Section 234A interest is ₹12,000 × 1% × 4 = ₹480.
Add the assumed applicable ₹5,000 Section 234F fee: ₹5,480, plus the ₹12,000 tax. Other interest, credits or facts may alter the actual result. This is a hypothetical calculation, not a claim that a future filing has already occurred.
FAQs
Is AY 2026–27 a new-law Tax Year?
No. It covers FY 2025–26 under the saved 1961 Act.
Can I revise after 31 December 2026?
For that AY, generally before 31 March 2027 or earlier assessment completion, subject to the Section 234-I fee where applicable.
Does ITR-UN replace every older ITR-U?
No. Rule 165 prescribes the new-law form; older years retain their applicable framework.
Does a notice change what I should do?
It can. Read and respond within its deadline, and check how it affects the available remedy. Do not assume filing alone answers it.
References
- Enacted Finance Act, 2026: old Section 139 amendments and Section 234-I .
- Income-tax Act, 2025 amended by Finance Act, 2026 Official ↗.
- Notified Rules, 2026: Rules 136, 164 and 165 Official ↗.
- Department transition guidance Official ↗.
Missed a step? TaxQue can help identify the year, deadline and lawful remedy. Contact: info@taxque.in | 9311256088 | taxque.in.
