Tax audit under Section 44AB: thresholds, Form 3CD, due dates and penalty

A tax audit under Section 44AB is a CA's review of your books, reported in Form 3CA or 3CB with the 44-clause Form 3CD annexure, that becomes compulsory when business turnover crosses ₹1 crore (₹10 crore if cash receipts and payments are each 5% or less), professional receipts cross ₹50 lakh, or you declare less than the presumptive profit under 44AD or 44ADA. The report is due by 30 September and the ITR by 31 October; missing it costs up to ₹1,50,000 under Section 271B.

Who needs a tax audit: the five triggers

Section 44AB lists five situations. Work through them in order, because the first one you hit decides the answer.

Two exemptions sit alongside these. A person who declares profit under Section 44AD(1) with turnover up to ₹2 crore (₹3 crore with the 5% cash condition) is outside 44AB(a) altogether, even if turnover is above ₹1 crore. And a person whose only income is covered by Sections 44B or 44BBA (shipping and aircraft non-residents) is excluded. The presumptive taxation guide covers who qualifies for 44AD and 44ADA.

The basic exemption limit referred to in clauses (d) and (e) is the amount not chargeable to tax: ₹4,00,000 under the default new regime for FY 2026-27, and ₹2,50,000, ₹3,00,000 or ₹5,00,000 under the old regime depending on age. Confirm with your CA which figure applies to you.

The ₹10 crore limit and the 5% cash test

Since AY 2021-22 the ₹1 crore threshold rises to ₹10 crore for businesses that are almost fully digital. Both parts of the test must be met in the same year:

• Aggregate cash receipts (including sales, advances, loans received and any other receipt) do not exceed 5% of all receipts.
• Aggregate cash payments (including purchases, expenses, loans repaid, capital expenditure) do not exceed 5% of all payments.

For this test, a cheque or bank draft that is not account payee is treated as cash. UPI, cards, NEFT, RTGS, IMPS and net banking are non-cash. The test looks at the whole year, so one large cash advance in a single month can tip you over.

Note the asymmetry with 44AD. The 44AD limit of ₹3 crore looks only at cash receipts; the 44AB proviso looks at both receipts and payments. A trader with turnover of ₹2.5 crore, 2% cash sales but 9% cash purchases can use 44AD (if otherwise eligible) but cannot claim the ₹10 crore audit limit, so if he opts out of 44AD he is audited under 44AB(a).

What turnover means

"Turnover" is not defined in the Act, so practitioners follow ICAI's Guidance Note on Tax Audit. Sales returns are deducted. Trade discounts shown on the invoice are excluded. GST collected and booked as a liability is generally excluded; GST included in sales and expensed is included. Sale of fixed assets and personal receipts are not turnover. For a commission agent, the commission is turnover, not the value of goods; for a share trader, the treatment depends on the type of transaction. For a profession, "gross receipts" means fees actually received, including advances, but not reimbursements billed separately.

Your GST returns and your books should agree on this figure. The income tax department matches turnover in the ITR against GSTR-1 and GSTR-3B, so a business that reports ₹98 lakh in the ITR and ₹1.04 crore in GST is inviting a query about why it was not audited. The GSTR-1 and GSTR-3B filing guide covers keeping these in step through the year.

What the audit involves: Form 3CA, 3CB and 3CD

A tax audit is not a separate set of books. The CA examines the books you already maintain, reconciles them with external records, tests the transactions that income tax law cares about and reports in a prescribed format.

Form 3CA is used when your accounts are already audited under another law: a company under the Companies Act, or an LLP whose turnover exceeds ₹40 lakh or contribution exceeds ₹25 lakh. The tax auditor refers to that statutory audit and adds the 3CD. Form 3CB is used by everyone else: proprietorships, partnership firms and LLPs below the audit limit. Here the CA expresses an opinion on the balance sheet and profit and loss account as well.

Form 3CD is the substance. Part A (clauses 1 to 8) is identity: PAN, GST and other registrations, nature of business, the sections under which the audit is conducted. Part B (clauses 9 to 44) is where your year is examined. The clauses that generate most of the work for a small business are:

Each clause is an opportunity for the auditor to report something adverse, and each adverse remark flows straight into computer-assisted scrutiny selection. That is why the preparation matters more than the audit itself. See the cash transaction limits guide for what clauses 21 and 31 look for, and the TDS guide for clause 34.

The CA files the report electronically from the CA login on the e-filing portal after you have added the CA and assigned Form 3CB-3CD. A UDIN is generated for every report. You then accept it from your login, and only after acceptance can the ITR that references it be filed. Since 2021, Rule 6G(3) allows the report to be revised if a 43B payment is made after the report but before the ITR due date, or to correct an error.

Due dates: 30 September and 31 October

For an assessee liable to audit under 44AB, the ITR due date under Section 139(1) is 31 October of the assessment year, and the audit report must be filed one month before that: 30 September. For FY 2026-27, that means the report by 30 September 2027 and the ITR by 31 October 2027.

Two knock-on effects are easy to miss. Partners of a firm that is under audit also get the 31 October due date for their own returns (Explanation 2 to Section 139(1)). And an individual or HUF whose accounts were audited in the previous financial year becomes liable to deduct TDS under Sections 194A, 194C, 194H, 194I and 194J from the next year, which means a TAN, monthly deposits and quarterly returns.

The CBDT has extended these dates in several recent years, typically by a month, usually in the last week of September. Do not plan around an extension; a report ready on 20 September costs the same as one ready on 20 October, and a late one costs up to ₹1,50,000.

The penalty under Section 271B

If you fail to get the audit done, or fail to furnish the report by the due date, Section 271B provides a penalty of 0.5% of total sales, turnover or gross receipts, or ₹1,50,000, whichever is less. The penalty is on the audit failure and is separate from the consequences of a late return: interest under Section 234A at 1% a month on unpaid tax, a fee of ₹5,000 under Section 234F (₹1,000 if income is up to ₹5 lakh), and loss of the right to carry forward business losses if the ITR is filed after the due date.

Section 273B lets the officer waive the penalty for reasonable cause. Accepted causes in decided cases include the auditor's resignation or death close to the due date, seizure of books, and a bona fide belief that audit did not apply where the question was genuinely arguable. "My CA was busy" and "I did not know" have not worked.

Worked example 1: a Kochi electronics shop

A Kochi electronics retailer (proprietorship, not under 44AD because margins are thin) has FY 2026-27 sales of ₹6,40,00,000 excluding GST. Cash receipts, counting cash sales and cash advances, total ₹28,00,000; everything else came by UPI, cards and bank transfer. Total payments for the year were ₹6,12,00,000, of which ₹21,50,000 was in cash (wages, small purchases, freight).

Cash receipts ratio = ₹28,00,000 ÷ ₹6,40,00,000 = 4.375%. Cash payments ratio = ₹21,50,000 ÷ ₹6,12,00,000 = 3.51%. Both are within 5%, so the ₹10 crore limit applies and no tax audit is required. He files ITR-3 by 31 July 2027 with a normal P&L. Had cash sales been ₹40,00,000 (6.25%), the ₹1 crore limit would apply, audit would be mandatory, and the ITR due date would move to 31 October 2027.

If he needed an audit and skipped it, the 271B penalty would be 0.5% × ₹6,40,00,000 = ₹3,20,000, capped at ₹1,50,000. A CA's fee for a business this size might be ₹40,000 to ₹80,000, so ignoring the requirement is never the cheaper option.

Worked example 2: a Pune architect and a Ludhiana transporter

A Pune architect (a specified profession) has gross receipts of ₹58,00,000 in FY 2026-27. That exceeds ₹50 lakh, so 44ADA is unavailable and 44AB(b) makes audit compulsory, whatever the cash share. Had receipts been ₹47,00,000, she could declare 50% (₹23,50,000) under 44ADA with no audit. If instead she declared actual profit of ₹14,00,000 (about 30%), because her studio rent and two salaried juniors cost ₹33,00,000, she would need an audit under 44AB(d) since her income exceeds ₹4,00,000. The audit fee of about ₹25,000 versus the tax on the extra ₹9,50,000 of deemed profit (roughly ₹1,40,000 plus cess in the new regime) makes the audit the better choice.

A Ludhiana transporter owns six trucks and has been declaring ₹7,500 per truck per month under Section 44AE, that is ₹5,40,000 for the year. In FY 2026-27 diesel and a major repair push his actual profit down to ₹3,10,000. He may declare the lower figure, but then 44AB(c) requires a tax audit and full books, even though his receipts are only ₹92,00,000. He should compare the tax saved on ₹2,30,000 (around ₹11,500 at the 5% slab) with the audit and bookkeeping cost before choosing.

How to prepare your books for a tax audit

Section 44AA requires an individual or HUF in business to keep books once income exceeds ₹2,50,000 or turnover exceeds ₹25,00,000 in any of the three preceding years (₹1,20,000 and ₹10,00,000 for others); specified professions follow Rule 6F, which lists a cash book, journal, ledger, carbon copies of bills above ₹25 and original bills for expenses above ₹50. Keep everything for six years from the end of the assessment year. Beyond the minimum, an audit goes smoothly when these are ready by mid-August:

1. Sales register reconciled to GST. Monthly sales in the books should match GSTR-1 and GSTR-3B, with credit notes and amendments explained. See invoice numbering rules for keeping the series audit-proof.
2. Purchase register with ITC status. Every purchase bill with the supplier's GSTIN, whether ITC was claimed, and whether the supplier is registered, unregistered or under composition (needed for clause 44).
3. Bank statements for every account, converted to a ledger and reconciled to the last rupee at 31 March; unexplained credits become income and unexplained debits become disallowed expenses. The bank reconciliation guide shows the method.
4. Cash book with daily balances, so that no 40A(3) payment above ₹10,000 per person per day and no 269ST receipt of ₹2 lakh or more slips through unnoticed.
5. Fixed asset register with purchase dates, invoice values, put-to-use dates and additions during the year, for the depreciation schedule under clause 18.
6. Stock statement at 31 March with the valuation method (cost or net realisable value, FIFO or weighted average) applied consistently.
7. TDS working by section and quarter, reconciled with challans and the 26Q/24Q returns, plus Form 26AS and AIS for TDS deducted on your receipts.
8. Creditor ageing with MSME status. Which suppliers are Udyam-registered micro or small enterprises, and which invoices were outstanding beyond 45 days at 31 March, for clause 22 and Section 43B(h). See the MSME 45-day rule.
9. Loans and deposits schedule: who lent, how much, by what mode, and confirmations for balances.
10. Related party list with amounts paid to relatives and their concerns during the year.

Give your CA the complete set at once rather than in pieces; the audit fee rises with every follow-up round, and the September rush is when mistakes get made.

Common mistakes

• Assuming audit applies at ₹1 crore without checking the 5% cash test, or assuming the ₹10 crore limit applies while ignoring cash payments.
• Opting out of 44AD in a bad year without realising 44AB(e) then forces an audit and 44AD is lost for five years.
• Treating GST inclusive sales as turnover in one year and exclusive in the next, changing audit applicability without a real change in business.
• Missing the 30 September date on the report while focusing on the 31 October ITR date.
• Depositing employees' PF or ESI after the statutory due date; clause 20 reports it and the deduction is lost permanently.
• Cash purchases above ₹10,000 recorded as several smaller vouchers to the same supplier on the same day; the auditor aggregates them.
• Not paying MSME suppliers by 31 March; clause 22 reports the amount and 43B(h) disallows it.
• Failing to add the CA on the e-filing portal in time, so the report cannot be uploaded even though it is ready.

How VyaparKit helps

Most of the audit preparation list is a matter of having clean, numbered records from April rather than reconstructing them in September. Issue every sale through GST invoice so the series and the GST report line up, record every purchase bill with the supplier's GSTIN and ITC flag so the clause 44 break-up is a filter rather than a project, and use the vendor ledger for creditor ageing and the MSME check. If your bank only gives PDFs, bank statement to Excel converts them into a sheet your CA can reconcile. VyaparKit does not perform the audit or prepare Form 3CD; that is your CA's work.

Next steps

• Compute FY 2026-27 turnover to date, cash receipts and cash payments as a percentage, and note which 44AB clause, if any, applies.
• If you are on 44AD or 44ADA, decide before March whether you will declare the presumptive profit or actual profit, since that decision sets the audit requirement.
• Reconcile sales to GST returns and the bank ledger every month so the year-end pack is a print-out, not a reconstruction.
• Add your CA on the e-filing portal and agree a delivery date for books by 15 August 2027.
• Diary 30 September 2027 for the report and 31 October 2027 for the ITR, without counting on an extension.