Getting the tax audit applicability for businesses right is the first compliance decision of every financial year-end — and the one most often misjudged. A tax audit under Section 44AB of the Income-tax Act, 1961 is not a penalty or a red flag; it is a mandatory examination of your books by a Chartered Accountant once your turnover crosses a defined limit. Miss the trigger, or miss the deadline, and the cost is real. For the financial year 2025-26 (assessment year 2026-27), the thresholds, forms and due dates below are the ones that apply to businesses operating in India.
What a Section 44AB tax audit actually is
A tax audit is an independent verification of your accounts to confirm that the income, deductions and disclosures you report to the Income Tax Department are supported by your books. The auditor — a practising CA — reports findings in a prescribed format and does not, in most cases, change your tax liability. What it does is give the department, and you, assurance that the numbers are clean. It sits alongside, but is separate from, a statutory audit under the Companies Act, which many companies must also undergo regardless of turnover.
Tax audit applicability for businesses: the turnover thresholds
For a business, the core trigger is turnover. A tax audit is required when total sales, turnover or gross receipts exceed Rs 1 crore in the financial year. There is one important relaxation: the limit rises to Rs 10 crore where both cash receipts and cash payments during the year are 5% or less of the respective totals. In practice, a business that transacts almost entirely through banking channels can operate up to Rs 10 crore of turnover before the audit obligation kicks in.
The 5% cash rule that lifts the limit to Rs 10 crore
The higher Rs 10 crore threshold is not automatic. Both conditions must hold together for the full year: aggregate cash receipts must not exceed 5% of total receipts, and aggregate cash payments must not exceed 5% of total payments. A single large cash movement can push either ratio above 5% and drop you back to the Rs 1 crore limit. This is why clean, digital-first bookkeeping is not just good hygiene — it directly decides whether you need an audit at all. Reliable bookkeeping through the year is what makes the 5% test defensible.
Professionals and presumptive taxation
The rule is different for professionals. A person carrying on a profession must get accounts audited when gross receipts exceed Rs 50 lakh in the year. Separately, businesses and professionals who have opted into the presumptive schemes under Sections 44AD or 44ADA can be pulled into audit if they declare income lower than the presumptive rate and their total income exceeds the basic exemption limit. If you use presumptive taxation, check the crossover carefully before assuming you are exempt.
The forms and the two deadlines that matter
The audit report is filed on Form 3CA or Form 3CB, accompanied by the statement of particulars in Form 3CD. Form 3CA applies where accounts are already audited under another law; Form 3CB applies otherwise. Two dates then govern the timeline for FY 2025-26:
- 30 September 2026 — the due date for the tax audit report to be uploaded by the CA.
- 31 October 2026 — the due date for filing the income tax return in cases subject to audit.
Businesses with transfer pricing obligations follow a later track — a 31 October 2026 report date and a 30 November 2026 return date. Because the CBDT has extended these dates in some past years, confirm the operative deadline closer to the date rather than assuming an extension. The safe assumption is always the statutory date. Support with your income tax filing keeps the report and the return moving in sequence rather than colliding at the end of October.
What non-compliance costs you
Failure to get accounts audited, or to furnish the report by the due date, attracts a penalty under Section 271B. The penalty is 0.5% of total sales, turnover or gross receipts, subject to a ceiling of Rs 1,50,000 — whichever is lower. The penalty is not automatic: Section 273B allows relief where the taxpayer shows reasonable cause for the failure. Reasonable cause is a matter of evidence, not assertion, so keep a documented trail if a delay is genuinely outside your control.
Does the new Income-tax Act, 2025 change anything this year?
Not for this filing cycle. The income of FY 2025-26 (AY 2026-27) continues to be governed by the Income-tax Act, 1961, and tax audits for the year are conducted on the familiar Forms 3CA / 3CB and 3CD. The Income-tax Act, 2025 takes effect from 1 April 2026 and applies to income earned in the tax year 2026-27 onward. So the audit you are preparing now runs under the old, well-settled framework — the transition matters for next year’s planning, not this year’s compliance.
How to get ready before 30 September
The businesses that clear a tax audit without friction are the ones whose books were audit-ready in real time, not reconstructed in September. Three things make the difference: ledgers reconciled monthly rather than in a year-end scramble; the cash-ratio test tracked through the year so the Rs 10 crore relief is not lost by accident; and Form 3CD disclosures — loans, related-party dealings, TDS compliance — mapped before the auditor asks. If your turnover is near either threshold, decide early whether tax audit support belongs in-house or with a partner who does it every day.