An income tax audit, or tax audit, is an examination of a taxpayer's books by a practising Chartered Accountant under section 44AB of the Income-tax Act, 1961. The CA reports the findings in Form 3CD with Form 3CA or 3CB. Missing a required audit attracts a penalty under section 271B of the lower of 0.5% of turnover or receipts, or ₹1,50,000.
Facts checked: 9 October 2026, for FY 2025-26 / AY 2026-27.
Tax audit meaning in plain words
A tax audit is not an inquiry by the tax department. It is a statutory audit that a taxpayer must get done by a CA when business turnover or professional receipts cross the prescribed limits, or when certain presumptive-scheme conditions are met. The CA gives the department a report on whether the books are kept, whether the figures agree with them, and on a set of specified particulars. It is different from a Companies Act statutory audit, though one firm often does both.
How the process works
- Applicability check. Decide which clause of 44AB applies; see who needs a tax audit.
- Appointment and books. The taxpayer engages a CA and provides books, bank statements, TDS and GST data. A documents checklist helps.
- Verification. The CA reviews the records and the particulars required by the form.
- Report. Form 3CA is used where accounts are also audited under another law, otherwise Form 3CB. Both are accompanied by Form 3CD; see Form 3CA, 3CB and 3CD explained.
- Upload and acceptance. The report is uploaded on the income tax portal and accepted by the taxpayer before the return is filed.
Clauses in Form 3CD
Form 3CD is a numbered statement of particulars. Examples of what it covers: method of accounting, depreciation, payments to specified persons, cash payments and loans above limits, TDS compliance, GST and the section under which the audit applies (Clause 8). A template is available at Form 3CD tax audit report.
Tax audit penalty under section 271B
| Turnover or receipts | 0.5% | Penalty |
|---|---|---|
| ₹1 crore | ₹50,000 | ₹50,000 |
| ₹2 crore | ₹1,00,000 | ₹1,00,000 |
| ₹5 crore | ₹2,50,000 | ₹1,50,000 (cap) |
Section 271B applies when the audit is not obtained or the report is not furnished by the due date. The penalty is levied by the Assessing Officer. Section 273B allows relief where the taxpayer shows reasonable cause. Consequences can extend beyond the fine, including notices and a weaker position in assessment, so treat the date as firm. See the current due date and 271B note.
Worked example
A trading firm has turnover of ₹4 crore and does not get an audit because the owner assumed the ₹10 crore limit applied, while cash payments were 8% of total payments. The audit was required under 44AB(a). Penalty is the lower of ₹2,00,000 (0.5%) and ₹1,50,000, so ₹1,50,000, unless reasonable cause is accepted.
Related reading
See the limits for AY 2026-27, due dates by year and the complete guide to section 44AB.
Frequently asked questions
What is the meaning of tax audit?
A statutory examination of books by a CA under section 44AB, reported in Form 3CD with 3CA or 3CB.
Who can conduct a tax audit?
A practising Chartered Accountant. The ICAI also limits the number of tax audits a CA can sign in a year; see the ICAI cap.
Is there a fine for filing the tax audit late?
Yes, section 271B, subject to reasonable cause under section 273B.
Is a tax audit the same as an income tax scrutiny?
No. A tax audit is an obligation on the taxpayer. Scrutiny is an assessment by the department.
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