Tax audit
What Tax audit means, how it works, a worked example, the mistakes we see and the questions founders ask.
DefinitionA tax audit under Section 44AB is an independent audit of accounts for income tax, required when business turnover exceeds ₹1 crore (₹10 crore if cash is under 5%) or professional receipts exceed ₹50 lakh.
The tax audit is separate from the statutory audit a company must have under the Companies Act. It applies to any taxpayer whose business turnover crosses ₹1 crore, raised to ₹10 crore when cash receipts and payments are each under 5% of the total, or whose professional receipts cross ₹50 lakh. It also catches anyone on presumptive taxation who declares profit below the presumptive rate while earning above the basic exemption. The auditor files Form 3CA or 3CB with the detailed Form 3CD by 30 September, and the ITR is then due on 31 October. You meet it as your business grows or when you step off 44AD. What it means for you: books must be complete by August, and failing to get audited attracts a penalty of 0.5% of turnover up to ₹1.5 lakh under Section 271B.
How Tax audit works
Section 44AB requires an audit of accounts when business turnover exceeds ₹1 crore, raised to ₹10 crore if cash receipts and cash payments are each 5% or less of the total, or when professional receipts exceed ₹50 lakh. It also applies when a taxpayer eligible for Section 44AD or 44ADA declares profit below the presumptive rate while total income exceeds the basic exemption, and when a business under 44AD opts out within the five-year lock. Companies and LLPs with turnover above the limit are covered just like proprietors.
The audit is conducted by an accountant as defined in Section 288, in practice, appointed by the taxpayer. The report is Form 3CA where the accounts are already audited under another law (a company under the Companies Act, for instance) and Form 3CB otherwise, in each case with Form 3CD, the statement of particulars running to over forty clauses covering depreciation, payments to related parties, TDS compliance, GST reconciliation, loans in cash, MSME dues and much else. The auditor uploads the report on the income tax portal with a unique document identification number, and the taxpayer approves it from their login.
The report is due by 30 September following the financial year (one month before the 31 October return due date), and the return cannot be filed as an audited return until the report is accepted. Failure to get the audit done attracts a penalty under Section 271B of 0.5% of turnover or gross receipts, up to ₹1.5 lakh, unless there is reasonable cause. The Income-tax Act 2025 keeps the same limits and dates under new section numbers.
A Coimbatore components manufacturer has turnover of ₹7.8 crore in 2025-26 with 2% of receipts and 3% of payments in cash, so it sits inside the ₹10 crore limit and needs no tax audit. Its sister trading firm, with ₹2.1 crore turnover and 30% cash sales, does. The firm closes its books in July, the auditor files Form 3CB and 3CD on 18 September 2026, and ITR-5 follows on 20 October, reporting ₹14 lakh of expenses disallowed under Section 43B(h) for MSME bills paid late.
Mistakes we see with Tax audit
- Counting the ₹10 crore limit while taking cash from customers and paying wages in cash above 5%, which drops the limit back to ₹1 crore.
- Treating the statutory audit of a company as the tax audit; they are separate reports under separate laws and the 3CD still has to be filed.
- Leaving the books open until September, so the auditor has no time and the report is filed late or with qualifications.
- Ignoring the 44AD exit rule, which brings a small trader into audit the moment profit below 8% is declared.
Last updated 19 October 2026. Checked against the MCA, GST, Income-tax and Trade Marks rules in force for October 2026.
Where you will meet this term
- Income Tax Planning & FilingSalaried people, investors, NRIs, freelancers and business owners who want the return right, not just filed.from ₹999
- Accounting & MISFounders who want the books closed every month and a one-page MIS they can actually read, with GST and TDS data ready on time.from ₹4,999/month
Questions founders ask about Tax audit
Is a tax audit the same as a statutory audit?
No. A statutory audit is required by the Companies Act for every company, whatever its size, and reports on the financial statements. A tax audit is required by the Income-tax Act above the turnover limits and reports in Form 3CD on tax compliance. A company above the limit has both.
Does a tax audit apply to a freelancer?
Only if professional receipts exceed ₹50 lakh (₹75 lakh with 95% digital receipts), or if the freelancer declares profit below 50% under 44ADA while total income exceeds the basic exemption. Below that, there is no audit, though books are required where 44ADA is not used.
What happens if the tax audit report is filed late?
A penalty under Section 271B of 0.5% of turnover up to ₹1.5 lakh can be levied unless reasonable cause is shown, and the return filed after 31 October is treated as late, with the ₹5,000 fee and loss of carry-forward of business losses.