Tax Audit vs Statutory Audit vs GST Audit: Key Differences
TL;DR
- Statutory audit is required for every company under the Companies Act, regardless of turnover or profit.
- Tax audit under Section 44AB (now Section 63) of the Income Tax Act applies once turnover/receipts cross a prescribed threshold, and certifies particulars used in tax computation.
- GST audit/reconciliation sits under the entirely separate CGST Act; most businesses now self-certify Form GSTR-9C rather than face a departmental audit.
- These three are not alternatives to each other; a mid-sized company routinely needs all three in the same financial year, each with its own auditor engagement, report, and due date.
One of the most common points of confusion we see from founders and finance teams is treating "audit" as a single event. In India, three separate audit-type requirements can apply to the same business in the same year, each created by a different law, each serving a different purpose, and each with its own filing deadline. Confusing one for another is how businesses end up missing a due date they did not know existed.
The Three Audits at a Glance
| Audit | Governing Law | Trigger | Purpose |
|---|---|---|---|
| Statutory Audit | Companies Act, 2013 | Every company, no turnover threshold | True and fair view of financial statements |
| Tax Audit | Income Tax Act (Section 44AB, now Section 63) | Turnover/receipts above a prescribed threshold | Certify specified particulars for tax computation |
| GST Audit/Reconciliation | CGST Act, 2017 | Aggregate turnover above a prescribed threshold, or departmental selection | Reconcile GST returns with audited accounts; verify tax paid, ITC claimed |
Statutory Audit: Mandatory for Every Company
A statutory audit under the Companies Act, 2013 applies to every company registered in India, private limited or public, the moment it is incorporated. There is no turnover or profit threshold, and there is no exemption for a company that has not started operations or has nil revenue. Even a dormant company with zero transactions must appoint an auditor and get its financial statements audited every year. This is the audit most founders think of first, because it is tied to the entity type (company) rather than to how much business the entity has done.
The statutory auditor examines whether the financial statements give a true and fair view, tests internal controls and accounting treatment, and reports under the Companies Act framework, including matters specified under CARO (the Companies (Auditor's Report) Order) where applicable. Note that this requirement is specific to companies; a proprietorship, partnership, or LLP does not have a Companies Act statutory audit requirement at all (an LLP has its own separate audit trigger based on turnover/contribution, distinct from both tax audit and GST audit).
Tax Audit: Turnover-Triggered, Under the Income Tax Act
A tax audit under Section 44AB (now Section 63 of the Income Tax Act, 2025) is a completely different requirement. It applies to a business or profession once turnover, sales, or gross receipts cross the prescribed threshold in a financial year (professionals have a separate, lower threshold from businesses; different limits also apply depending on the extent of cash transactions). Unlike a statutory audit, a tax audit applies regardless of business structure, so it can apply to a proprietorship, partnership, LLP, or company alike, purely based on crossing the turnover line.
The tax auditor issues Form 3CA (where the entity is already subject to audit under another law, such as a company's statutory audit) or Form 3CB (where the tax audit is the only audit being conducted), accompanied by Form 3CD, a detailed statement of prescribed particulars covering depreciation, disallowances, TDS compliance, related-party transactions, and more. This audit exists specifically to give the tax department a reliable, CA-certified basis for computing taxable income; it is not an opinion on the financial statements as a whole the way a statutory audit is. For the exact current turnover thresholds and which categories of taxpayers are covered, see our Section 44AB turnover limits guide, and for the filing deadline and penalty exposure if it is missed, see our tax audit due date and penalty guide.
GST Audit and Reconciliation: A Separate Law Entirely
GST audit obligations sit under the CGST Act, 2017, which has nothing to do with either the Companies Act or the Income Tax Act. Two distinct things get called "GST audit" in practice. First, a departmental audit under Sections 65 or 66 of the CGST Act, where GST officers examine a taxpayer's records, is a discretionary, selection-based exercise, not an annual requirement for everyone. Second, and far more relevant to most businesses, is the annual self-certified reconciliation in Form GSTR-9C, required once aggregate turnover in a financial year crosses a prescribed threshold, filed alongside the GSTR-9 annual return. This reconciles the turnover, tax paid, and input tax credit reported across the year's GST returns against the audited (or otherwise finalised) financial statements.
We have covered GSTR-9C mechanics, the current turnover threshold, and what auditors actually check in detail in our GST audit applicability guide, so we won't repeat that here. The point for this comparison is simpler: GST audit/reconciliation runs on GST returns and GST law, completely independent of whether the same business also needs a statutory audit or a tax audit.
Do These Audits Overlap, or Can One Replace Another?
They do not replace each other, and crossing one threshold does not automatically trigger another. A private limited company always needs a statutory audit from incorporation. Whether it also needs a tax audit depends purely on its turnover crossing the Section 44AB threshold. Whether it also needs GSTR-9C reconciliation depends purely on its GST aggregate turnover crossing that separate threshold. A company could, in principle, need a statutory audit but not yet a tax audit (low turnover, early-stage company), or need both a statutory and tax audit but sit below the GST reconciliation threshold, or need all three simultaneously once it scales.
Where they genuinely connect is in the paperwork: the tax auditor typically starts from the statutory-audited financial statements (which is exactly why Form 3CA exists, to record that another audit under a different law already covers the accounts), and the GST reconciliation in GSTR-9C is built by comparing GST returns against those same financial statements. So while the three audits are legally independent, they are practically sequential; get the statutory audit right first, and the tax audit and GST reconciliation both become materially easier.
Why a Growing Business Commonly Needs All Three
Consider a mid-sized private limited company doing, say, Rs 8 crore in annual turnover. It needs a statutory audit because it is a company, full stop. It almost certainly needs a tax audit because its turnover is well above the Section 44AB threshold. And it almost certainly needs GSTR-9C reconciliation because its GST aggregate turnover is above that threshold too. Three separate reports, three separate due dates, and in practice usually the same CA firm coordinating all three because the underlying books of account are shared. Treating these as one combined "annual audit" project, rather than three unrelated compliance items discovered one at a time, is the difference between a smooth close and a scramble each September-October.
Quick Reference: Who Needs Which
- Statutory audit: Every company under the Companies Act. No turnover threshold. LLPs and proprietorships are not covered by this specific requirement.
- Tax audit (Section 44AB / now 63): Any business or professional (any structure) crossing the prescribed turnover/receipts threshold, or falling under the presumptive-taxation opt-out rules.
- GST audit/reconciliation (GSTR-9C): Any GST-registered person crossing the prescribed aggregate turnover threshold under the CGST Act, regardless of entity type or whether a statutory or tax audit applies.
If you are unsure which of these applies to your business this year, the safest approach is to check all three thresholds independently rather than assuming one triggers the others. Our audit and assurance services cover statutory audit, tax audit, and GST reconciliation together so nothing falls through the gap between the three laws.
Not sure which audits apply to your business?
We handle statutory audit, tax audit, and GST reconciliation together, so deadlines across all three are tracked in one place.
Frequently Asked Questions
Is a tax audit the same as a statutory audit?
No. A statutory audit is required under the Companies Act for every company regardless of turnover or profit, and examines the true and fair view of the financial statements. A tax audit is required under the Income Tax Act (Section 44AB, now Section 63) only once turnover or receipts cross a prescribed threshold, and its purpose is to certify specified particulars for tax computation, not to opine on the financial statements as a whole.
Can the same chartered accountant do the statutory audit and the tax audit?
Generally yes, and in practice it usually is the same firm, since the tax auditor relies heavily on the audited financial statements. The two remain legally distinct engagements with separate reports (audit report under the Companies Act vs Form 3CA/3CB and 3CD under the Income Tax Act), and a private limited company's statutory auditor cannot always double as tax auditor if independence or rotation rules under the Companies Act create a conflict; check with your CA on a case-by-case basis.
Does a private limited company always need a tax audit as well as a statutory audit?
Not necessarily. A statutory audit applies to every company regardless of size. A tax audit under Section 44AB only kicks in once turnover crosses the prescribed threshold (or lower thresholds apply for professionals, or where cash transactions exceed the specified percentage). A small, low-turnover private limited company can therefore need a statutory audit but not a tax audit in a given year.
Is GST audit still applicable, or has GSTR-9C replaced it?
The GST department-conducted "audit" under Section 65/66 of the CGST Act is separate from the annual reconciliation statement in Form GSTR-9C, which most taxpayers above the prescribed aggregate turnover threshold must self-certify and file alongside the GSTR-9 annual return. See our dedicated guide on GST audit applicability for the current turnover threshold and what GST auditors check.
Which audit should a growing business plan for first?
A company incorporated under the Companies Act needs a statutory audit from year one, irrespective of turnover. Tax audit and GST reconciliation obligations are then triggered independently as turnover crosses their respective thresholds, so a business should track all three thresholds separately rather than assuming crossing one automatically triggers the others.