Tax Audit Deadline Is September 30, Not October 31 as Many Think

The income tax audit report for FY 2025-26 is due September 30, 2026, not October 31, despite that second date circulating widely online. The confusion is understandable: October 31 is real, it’s just a different deadline, the one for actually filing the income tax return once a tax audit applies. As of September 19, the Central Board of Direct Taxes had not granted an extension despite requests from chartered accountant associations, so the September 30 date currently stands.

Two Different Deadlines, Often Confused

Deadline	Date	What it covers
Tax audit report	September 30, 2026	A chartered accountant must complete and file the audit report itself
Income tax return filing	October 31, 2026	The taxpayer’s actual return, due only after the audit report is filed

The audit report has to come first because the return itself depends on figures the audit confirms. Reports circulating online that describe October 31 as “the” tax audit deadline are, going by CBDT’s own confirmed position, mixing up these two dates, not describing an actual extension.

Who Actually Needs a Tax Audit

A tax audit under what’s still commonly called Section 44AB applies to businesses with total sales, turnover or gross receipts above Rs 1 crore in the previous year, and to professionals with gross receipts above Rs 50 lakh. That business threshold rises to Rs 10 crore if more than 95 percent of both receipts and payments happened in non-cash form during the year, a carve-out meant to reward businesses that operate mostly through digital payments rather than cash.

What Missing It Actually Costs

Missing the audit deadline without reasonable cause triggers a Section 271B penalty of 0.5 percent of total sales, turnover or gross receipts, capped at Rs 1.5 lakh. If there’s a reasonable cause for the delay, the penalty isn’t levied at all, it isn’t automatic. Budget 2026 has proposed reclassifying this from a penalty into a fee, a technical distinction that matters more for how it’s contested than for the amount itself.

Why the New Income Tax Act Doesn’t Apply to This Audit

The new Income Tax Act, 2025 has generated its own share of confusion this tax season, partly because it’s a genuinely large change: it replaces the Income Tax Act, 1961 outright, renumbers most provisions, and consolidates the audit report itself into a new single Form 26 in place of the old Forms 3CA, 3CB and 3CD. Old Section 44AB becomes Section 63 under the new numbering. None of that applies to the audit due this month. The new Act takes effect from April 1, 2026, governing FY 2026-27 onward, while the audit due September 30, 2026 covers FY 2025-26, a year that falls entirely under the old 1961 Act. This year’s audit report still uses the old forms and the old section numbers; the new Form 26 and Section 63 apply starting with next year’s audit cycle, not this one.

Whether an Extension Is Coming

Chartered accountant associations have formally asked CBDT to push the audit deadline to October 31, citing the same reasoning behind past extensions, portal load and the compressed window after the ITR filing deadline. As of September 19, no such extension had been announced. Deadlines like this one have moved before, sometimes with only days of notice, so anyone relying on an extension that hasn’t been confirmed is taking a real risk rather than a safe bet. This article will be updated if CBDT issues one.

IndiaRealTime covered a similarly misunderstood deadline earlier this month with the GSTR-3B due date landing on a Sunday, where the same pattern applied: the headline date doesn’t move just because it’s inconvenient, only a specific notification changes it. For businesses juggling working capital during audit season, IndiaRealTime’s fixed deposit rate tracker and mutual funds section cover where short-term cash can sit productively, and the bank holidays calendar is worth checking before planning a branch visit around any audit-related paperwork.

Elsewhere in compliance deadlines this month: how the new Rs 25,000 EPF wage ceiling actually works.

FAQs

Is the tax audit deadline September 30 or October 31?
September 30, 2026 for the audit report itself. October 31, 2026 is the separate income tax return filing deadline for taxpayers whose accounts require an audit.

Who needs a tax audit?
Businesses with turnover above Rs 1 crore (Rs 10 crore if over 95 percent of receipts and payments are non-cash) and professionals with gross receipts above Rs 50 lakh.

What’s the penalty for missing the tax audit deadline?
0.5 percent of turnover or gross receipts, capped at Rs 1.5 lakh, under Section 271B, unless there’s a reasonable cause for the delay.

Does the new Income Tax Act, 2025 apply to this year’s audit?
No. It takes effect from FY 2026-27 onward. The audit due September 30, 2026 covers FY 2025-26 and still follows the old 1961 Act, with the old Forms 3CA, 3CB and 3CD.

Has the deadline been extended?
Not as of September 19, 2026, despite requests from chartered accountant associations. Check for updates before assuming one has been granted.

Sources

• PGT & Associates: Tax audit due date AY 2026-27, 30 September, not extended
• CAclubindia: Tax audit deadline AY 2026-27, penalty for missing September 30
• CORAA: Income Tax Act 2025 audit transition, practical playbook for FY 2026-27
• Verotus LLP: Income Tax Act 2025 tax audit, what’s new in Form 26 for tax year 2026-27
• ClearTax: Section 44AB income tax audit, due date, criteria, penalty

Updated September 26, 2026.