Tax Audit ITR Filing Due Date — 31 October 2026

Tax Audit ITR Filing explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.

The tax audit ITR filing due date for AY 2026-27 is 31 October 2026 for an assessee whose accounts are required to be audited, and 30 November 2026 where a report under section 92E is also required. The audit report itself is due a month earlier, on 30 September 2026.

Two deadlines, one month apart

The confusion behind most searches for the tax audit ITR filing due date is that an audited assessee has two deadlines, and the earlier one belongs to the auditor while the later one belongs to the taxpayer.

The relationship runs one way. The specified date for the report is defined as one month prior to the section 139(1) due date, so the tax audit ITR filing due date is the primary date and the report date is derived from it.

Who gets the 31 October date

Explanation 2 to section 139(1) sets the return due date by class of assessee. The 31 October class includes:

• a company;
• a person, other than a company, whose accounts are required to be audited under the Income-tax Act or any other law in force; and
• a working partner of a firm whose accounts are required to be audited.

Note the wording carefully — "required to be audited under this Act or under any other law". A company is in this class because of the Companies Act audit, whether or not it crosses the section 44AB turnover threshold at all.

Which Act governs AY 2026-27

AY 2026-27 corresponds to the previous year ended 31 March 2026, and that year is governed by the Income-tax Act, 1961. The Income-tax Act, 2025 takes effect from 1 April 2026 and applies from tax year 2026-27, with section 536 preserving the old Act for earlier years including assessments, appeals and penalties.

So for this filing season the tax audit ITR filing due date sits under section 139(1) of the 1961 Act. For the year now running, the return provision is section 263(1) of the Income-tax Act, 2025, and the audit specified date is defined by section 63(5)(a) as one month prior to it — the same architecture with new numbers.

Filing late — what it actually costs

Missing the tax audit ITR filing due date does not close the door on filing, but it has three separate consequences and they are cumulative.

Interest under section 234A

Interest runs on the tax payable for the period of delay, computed from the day after the due date. This is the one that scales with the amount of tax outstanding, so it is the expensive consequence for a profitable audited business.

Fee under section 234F

A fee applies for furnishing the return after the due date. It is a flat amount rather than a percentage, so it is the less significant item for a large assessee and the more noticeable one for a small assessee with modest tax.

Loss of carry forward

Certain losses cannot be carried forward if the return is not furnished within the section 139(1) due date. For a business with a loss year, this is frequently the largest cost of all — larger than interest and fee combined — because it removes a set-off against future profits entirely.

The sequence to work to

1. Establish the class of assessee, and therefore the tax audit ITR filing due date, at the start of the season — not in October.
2. Get the audit report furnished by the specified date: assignment, 3CD particulars, upload with DSC and audited financials, then acceptance from the worklist.
3. Reconcile the audited figures into the return computation before drafting the return, rather than filing and revising.
4. Confirm advance tax and TDS credits against Form 26AS and the annual information statement.
5. Pay self-assessment tax before filing, so that section 234A interest stops running.
6. File by the due date, and keep the acknowledgement with the audit report acknowledgement in one place.

If a date is extended

CBDT can extend a date by order under section 119. Two cautions apply. First, an order that moves the tax audit ITR filing due date does not necessarily move the report date, or vice versa — read what it actually says. Second, extension orders have in the past expressly preserved section 234A interest from the original date where self-assessment tax exceeded a threshold, so a headline extension is not always a free extension.

Nothing on this page asserts that any date for AY 2026-27 has been extended. Verify on the e-filing portal before relying on a date.

Common mistakes

• Treating 31 October as the audit report date. That is the return date; the report is 30 September.
• Filing a working partner's return on the ordinary individual date when the firm is audited.
• Assuming a company is outside the audited class because turnover is below the threshold. The Companies Act audit puts it in.
• Treating a loss year as low risk for a late return.
• Assuming an extension of the return date automatically moves the audit report date.