Tax Audit Deadline Is Today, 21 October 2026: Missed It? Section 271B Penalty, 234A Interest & What to Do Next

Today, 21 October 2026, is the extended due date for furnishing tax audit reports under Section 44AB for Assessment Year 2026-27, per CBDT Circular No. 07/2026 dated 28 September 2026. The original 30 September deadline was moved by 21 days; there is no expectation of a second extension. If your audit is still pending, today is the day to act — and if you are going to miss it, you should understand exactly what it costs and what to do next.

For every other compliance date this season, check our tax compliance calendar hub.

Who today’s deadline applies to

The extension covers taxpayers at Serial No. 2 of the table under Explanation 2 to Section 139(1) — the audit category. In practice:

• Businesses with turnover exceeding ₹1 crore in FY 2025-26 (₹10 crore if cash transactions are within 5% of receipts/payments), requiring audit under Section 44AB.
• Professionals with gross receipts exceeding ₹50 lakh (₹75 lakh with cash conditions), requiring audit.
• Companies, firms and LLPs whose accounts must be audited, including eligible working partners.
• Audited trusts and institutions, for whom the timeline also affects Form 10B/10BB planning.

It does not apply to transfer-pricing cases under Section 92E (Form 3CEB follows its own separate timeline), nor to salaried or non-audit taxpayers — their dates were never moved. If you filed late as a non-audit taxpayer, read our guide on belated returns till 31 December 2026 instead.

The cost of missing it: Section 271B penalty

Failure to get accounts audited or to furnish the audit report by the due date attracts a penalty under Section 271B: the lesser of 0.5% of total sales, turnover or gross receipts, and ₹1.5 lakh.

Two nuances matter. First, the penalty is not mechanical: the Assessing Officer can drop it where you show reasonable cause for the delay (Section 273B) — documented illness, genuine portal failures on the last day, or a bona fide interpretation dispute can all count, but “I forgot” will not. Tribunals have set aside 271B penalties where taxpayers demonstrated a bona fide cause and completed compliance promptly afterwards. Second, penalty does not end your obligation: you must still get the audit done and file.

The silent compounding: 234A interest at 1% per month

Separate from the audit penalty, Section 234A charges interest at 1% per month or part of a month on the tax remaining unpaid — counted from the original return-filing due date (31 October 2026 for audit cases) until you actually pay. This interest accrues even where the return deadline itself was extended; the extension moved your filing date, not your tax-payment obligation. The practical lesson: pay the tax now, file the paperwork as soon as it is ready. Advance or self-assessment tax paid today stops 234A compounding on the amount paid, and 234A runs on the unpaid balance only.

Your action plan if the audit is not done today

1. Call your CA today. The audit report must be furnished electronically in Form 3CA/3CB with Form 3CD. If books are ready, the upload itself can happen today or tonight.
2. Pay the self-assessment tax immediately. Every month of unpaid tax costs 1% under 234A. Pay on the portal today even if the report will follow.
3. Furnish the report as early as possible. The ITR for audit cases is due 21 November 2026 — but you cannot file a credible return without the audit findings. Get the report in first, then the return.
4. Document the delay. Keep written evidence of whatever caused the miss — emails with your CA, portal error screenshots with timestamps, medical certificates. This becomes your reasonable-cause file if a penalty notice arrives.
5. Do not stop filing. A late audit report plus a late ITR is two problems. The return can still be filed by 21 November 2026; a belated return remains possible until 31 December 2026 under Section 139(4).

Still wrapping up your FY 2025-26 compliance? Revisit our tax-audit extension checklist for who the extension covers, and our income tax hub for calculators and guides.

FAQs

1. What exactly is due on 21 October 2026?

The tax audit report — Form 3CA or 3CB along with Form 3CD — furnished by your chartered accountant on the income-tax e-filing portal. The corresponding ITR for audit cases is due 21 November 2026.

2. How is the Section 271B penalty computed?

The lesser of 0.5% of your total sales/turnover/gross receipts and ₹1.5 lakh. It can be waived by the Assessing Officer where reasonable cause for the delay is established under Section 273B.

3. Does the extension also delay when I must pay tax?

No. The Circular 07/2026 extension moved the filing deadlines; tax-payment obligations remain on their original timelines, and Section 234A interest at 1% per month applies on unpaid tax from the original due date.

4. My audit report is late, but can I still file the ITR on time?

The audit report should be furnished before the ITR, since the return depends on audited figures. If you cannot complete both by 21 November 2026, a belated return under Section 139(4) can be filed until 31 December 2026 — with applicable fees and interest.

5. Is there any chance of a further extension beyond 21 October 2026?

As of today, no. The department itself is nudging professionals to finish (CBDT recently contacted around 12,000 tax professionals over pending reports, and over 19.5 lakh reports have already been filed). Plan on today being the final date.