Tax audit under Section 44AB — who it applies to, and when.

What Section 44AB tax audit is

Section 44AB of the Income Tax Act, 1961 requires certain taxpayers carrying on business or profession to get their accounts audited by a Chartered Accountant and to furnish an audit report in the prescribed form. The audit does not certify that the entity is profitable or well run — it certifies that the books of account are correctly maintained, that the particulars in Form 3CD are accurate, and that the reported income is computed in accordance with the Act.

It is a distinct, additional requirement layered on top of any audit already required under the Companies Act or another statute. A private limited company, for example, gets both a statutory audit under the Companies Act and a tax audit under Section 44AB if it crosses the 44AB threshold — the same CA firm often does both, but they are separate engagements with separate reports.

Who is covered: turnover and gross receipt limits

Applicability turns on turnover (for a business) or gross receipts (for a profession) in the financial year, with a carve-out for taxpayers who operate largely on digital/banking channels rather than cash. The table below summarises the commonly applied thresholds.

These are the thresholds and the cash-percentage test as commonly applied — verify the current figures on the Income Tax e-filing portal before using them in an actual filing, since turnover limits, the digital-transaction percentage, and presumptive rates are all subject to change by the Finance Act.

How presumptive taxation interacts with the audit trigger

Sections 44AD (business) and 44ADA (profession) let eligible small taxpayers declare profit at a prescribed percentage of turnover or gross receipts without maintaining detailed books, and without a tax audit — provided the declared profit is at or above the prescribed rate. The moment a taxpayer eligible for these sections reports a lower profit than the presumptive rate, and total income exceeds the basic exemption limit, Section 44AB compels an audit even though turnover is well under the standard ₹1 crore / ₹10 crore limits.

This is the trap that catches articled assistants and first-year practitioners: a client wants to show actual (lower) profit instead of the presumptive rate to reduce tax outgo, without realising that decision now mandates an audit. It is worth flagging to the client at the estimation stage, not after the year has closed.

Worked example — does this business cross the threshold?

A trading business has the following figures for the financial year. Assume no other income and eligibility for Section 44AD is being evaluated.

Step 1 — check turnover against the base limit. Turnover of ₹2.40 crore exceeds ₹1 crore, so a plain-vanilla audit would already apply. The question is whether the ₹10 crore digital-transactions relief instead applies.

Step 2 — test the cash-receipts percentage.

Cash receipts ÷ Total receipts = 8,00,000 ÷ 2,40,00,000 = 3.33%

Step 3 — test the cash-payments percentage.

Cash payments ÷ Total payments = 6,50,000 ÷ 2,21,50,000 = 2.93%

Both ratios are under 5%. The business qualifies as "substantially digital," so the applicable turnover threshold is ₹10 crore, not ₹1 crore. Since actual turnover of ₹2.40 crore is well below ₹10 crore, no tax audit is required under Section 44AB for this business on these facts — even though turnover alone crossed ₹1 crore.

Change one fact and the answer flips: if cash receipts had instead been ₹14,00,000 (5.83% of turnover), the digital-transactions relief would not apply, the ₹1 crore threshold would govern, and the audit would be triggered because turnover exceeds it.

Due date and the Form 3CA/3CB/3CD structure

The tax audit report must be filed electronically before the income tax return due date applicable to audit cases — commonly 30 September of the assessment year, one month earlier where a transfer pricing report under Section 92E is also required, and subject to any extension notified for that year. Verify the exact due date for the relevant assessment year on the Income Tax e-filing portal — this date has been extended in several recent years and should never be assumed.

• Form 3CA — used when the assessee's accounts are already required to be audited under another law (e.g. a company under the Companies Act). The CA reproduces the fact of that audit and attaches Form 3CD.
• Form 3CB — used when no other law mandates an audit (typically proprietorships and firms). The CA audits the accounts specifically for this purpose and reports on their true and fair view, then attaches Form 3CD.
• Form 3CD — the statement of particulars, common to both routes. It runs across roughly 40-plus clauses covering the nature of business, method of accounting, related-party and quantitative details, disallowances under sections such as 40A(3), 43B, TDS compliance, GST reconciliation items, and more. Do not rely on a remembered clause number when drafting — check the current form against the latest notified format, since clauses are renumbered and added periodically.

Practical notes for a practising CA

• Track turnover through the year, not just at year-end. A client crossing ₹1 crore in month nine still needs clean books from day one — retrofitting a full year's vouchers in August is where most audit-season pain comes from.
• Reconcile turnover to GST returns. Form 3CD explicitly calls for GST turnover reconciliation. A mismatch between books turnover and GSTR-1/3B turnover is one of the first things reviewers and assessing officers query — resolve it before the report is signed, not after.
• Don't assume presumptive means audit-free. As shown above, a client under Section 44AD who wants to report actual (lower) profit needs to know upfront that this may trigger an audit. Model both outcomes before advising.
• One report, one financial year, one CA — but track the appointment properly. Ensure the audit appointment is within the number of tax audits a CA/firm may accept in a year and that UDIN is generated for the report and Form 3CD — both are compliance requirements independent of 44AB itself.
• Multiple businesses, one PAN. Turnover of all businesses/professions carried on by the same person is generally aggregated for testing the threshold unless a specific exclusion applies — check this carefully for clients running more than one proprietorship.

Where clean books make the audit faster

Most of a tax audit's timeline is spent reconciling — turnover to GST returns, cash book to bank statements, TDS deducted to TDS deposited — rather than on the audit opinion itself. TatvaBooks keeps GST-correct invoices, GSTR-2B reconciliation and a full audit trail in one place through the year, so when audit season arrives the books your team pulls up already tie out to the return data instead of needing to be rebuilt from scratch. See what's in the product for CA firms on the TatvaBooks for Chartered Accountants page.

Frequently asked questions