ITR Filing Due Dates for FY 2025-26 (AY 2026-27) — Complete Deadline Guide

Why ITR Deadlines Matter More Than Ever in FY 2025-26

The Union Budget 2026 introduced two significant changes to ITR filing timelines that every Chartered Accountant must note: a new 31 August deadline for business/profession cases without audit, and an extended revised return window up to 31 March of the assessment year. Missing any deadline triggers penalties under Section 234F, interest under Section 234A, and — critically — forfeiture of the right to carry forward capital losses.

This guide consolidates every deadline for AY 2026-27 in one place, along with the correct ITR form for each taxpayer category, applicable penalty rates, and a pre-filing document checklist.

Key Due Dates at a Glance — AY 2026-27

All dates are based on the Income Tax Act 1961, Budget 2026 Finance Bill, and CBDT notifications as of April 2026. Verify any extensions at incometax.gov.in before advising clients.

Month-by-Month Compliance Calendar — AY 2026-27

Use this timeline to plan your filing season workload across all client categories.

• April–June 2026: Collect broker P&L statements, capital gains reports, and ledgers from clients. Reconcile with Form 26AS and AIS.
• 30 June 2026: Advance tax fourth installment due for FY 2025-26.
• 31 July 2026: ITR-1 and ITR-2 deadline — salaried, pensioners, and investors with only capital gains.
• 31 August 2026: ITR-3 and ITR-4 deadline for business/profession cases not requiring audit (new — Budget 2026).
• 30 September 2026: Tax audit report (Form 3CA/3CB/3CD) submission deadline for audit cases.
• 31 October 2026: ITR-3, ITR-5, ITR-6 deadline for tax audit cases under Section 44AB.
• 30 November 2026: ITR deadline for transfer pricing cases with Form 3CEB under Section 92E.
• 31 December 2026: Last date to file a belated return for FY 2025-26 with late fee.
• 31 March 2027: Revised return deadline for FY 2025-26 — also the revised return window under Budget 2026 extended provisions.
• 31 March 2031: Updated Return (ITR-U) deadline for FY 2025-26 (five assessment years from AY 2026-27).

Which ITR Form to File — Quick Selector

Choosing the wrong ITR form is one of the most common errors in CA practice. Use this guide to select the correct form for each client.

Key practical note: A client who trades F&O or does intraday equity trading — even alongside a salaried income — must file ITR-3, not ITR-2. This is among the most frequent form-selection errors CAs encounter when consolidating broker statements.

Penalty for Late ITR Filing — Section 234F, 234A

Filing after the original due date triggers two separate charges that accumulate independently.

Section 234F — Late Filing Fee

• ₹5,000 if the return is filed after the due date but on or before 31 December 2026
• ₹10,000 if filed after 31 December 2026 (i.e., as a belated return in January–March 2027 — but note: a belated return is only due by 31 December; after that, ITR-U is required)
• ₹1,000 concessional fee if total income does not exceed ₹5 lakh

Section 234A — Interest on Unpaid Tax

Interest is levied at 1% per month (or part of a month) on the unpaid tax amount, calculated from the original due date to the actual date of filing. This applies only when there is outstanding tax after TDS and advance tax credits.

Loss of Carry-Forward Rights

A belated return (filed after the original due date) cannot carry forward capital losses, F&O losses, or other business losses. This is the most financially significant consequence of missing the deadline — clients with large unrealised losses lose the ability to set them off in future years.

Updated Return (ITR-U) — Additional Tax Rates

ITR-U allows correcting omissions or errors in original returns, but levies additional tax on the incremental income:

• 25% additional tax if filed within 12 months from the end of the relevant assessment year
• 50% additional tax if filed between 12 and 24 months from the end of the relevant assessment year
• 60% additional tax if filed between 24 and 60 months from the end of the relevant assessment year

Pre-Filing Checklist — Documents to Collect

For equity investors and traders, gather the following before beginning the ITR:

• Broker P&L statements for FY 2025-26 from all platforms the client traded on (Zerodha, Groww, Angel One, Upstox, etc.)
• Capital gains statement from all mutual fund RTAs (CAMS, KFintech) and direct mutual fund platforms
• Form 26AS — verify TDS credits, advance tax paid, and SFT transactions
• AIS (Annual Information Statement) — cross-check sale consideration reported by brokers against AIS figures
• Bank interest certificates — savings accounts, fixed deposits, and RD interest
• House property details — rental income, municipal tax receipts, home loan interest certificate
• Section 80C–80U investment proofs — ELSS, PPF, NPS, insurance premiums, tuition fees
• Foreign assets disclosure — if any foreign shares, bank accounts, or property held during FY 2025-26
• PAN and Aadhaar — verify linking status; unlinked PAN attracts higher TDS and bars ITR filing

Frequently Asked Questions

Can I file ITR after 31 July 2026?

Yes — as a belated return by 31 December 2026, with a late filing fee of ₹5,000 (₹1,000 if income is below ₹5 lakh). However, you forfeit the right to carry forward capital losses and certain other losses. After 31 December, only an Updated Return (ITR-U) with additional tax is possible.

What is the new 31 August 2026 deadline?

Budget 2026 introduced a new intermediate deadline for individuals and HUFs with business or professional income who do not require a tax audit. Previously these taxpayers shared the 31 July deadline with salaried individuals. The separate 31 August window provides additional time for self-employed professionals and small business owners to compile books of account.

My client trades on three brokers — which ITR form applies?

The form depends on the nature of trading, not the number of brokers. Delivery-based equity trades with no business income → ITR-2. F&O trades or intraday equity trades of any amount → ITR-3 (treated as business income). If the client has both salaried income and F&O trading, they still file ITR-3.

Does missing the due date affect my client's refund?

Yes. Late filing delays refund processing, and if there is outstanding tax, Section 234A interest accrues. Refunds due on belated returns may also attract delayed refund interest only from the date of filing (not the due date), which can reduce the total refund amount after netting.

What is the difference between a revised return and an updated return?

A revised return can be filed by the taxpayer voluntarily to correct any error or omission — it carries no additional tax. It can be filed up to 31 March 2027 (for FY 2025-26). An updated return (ITR-U) is used when the original deadline has passed and additional income needs to be disclosed — it attracts an additional tax of 25%–60% depending on when it is filed. ITR-U cannot be used to claim a refund or reduce tax liability.

Is the 30 September tax audit report deadline independent of the 31 October ITR deadline?

Yes. The audit report in Form 3CA/3CB/3CD must be filed by 30 September 2026, which is the auditor's responsibility. The ITR itself is then due 31 October 2026 for the same client category. Missing the audit report deadline effectively makes it impossible to file the ITR on time, so CAs should target completing audit assignments well before the September end.

Can capital losses be carried forward if a belated return is filed?

No. Capital losses — both short-term (STCL) and long-term (LTCL) — can only be carried forward if the original return is filed on or before the applicable due date. A belated return forfeits carry-forward rights for that year's losses. This is one of the most financially impactful consequences of missing the filing deadline for clients with large unrealised losses in FY 2025-26.

Summary — All FY 2025-26 Deadlines in One Table

Always verify any CBDT extensions via the official Income Tax Department portal at incometax.gov.in before advising clients on final deadlines.