Tax Audit Under Section 44AB: Thresholds, Forms 3CA/3CB/3CD, and Due Dates

Tax audit under Section 44AB is one of the few compliances where the threshold sounds simple but the application is anything but. The Rs 1 crore line moves to Rs 10 crore depending on cash usage. Professionals have a separate Rs 50 lakh limit. Presumptive scheme users get pulled in if they declare lower income. And the September 30 deadline is the same year after year, but every year a sizeable share of audit-eligible businesses miss it.

This guide unpacks Section 44AB systematically: who is covered, who is exempt, the cash-test, the presumptive scheme interaction, the forms, and the action plan to keep the audit on track.

Section 44AB at a Glance

Section 44AB requires certain assessees to get their accounts audited by a Chartered Accountant and file a tax audit report. The audit is in addition to (and separate from) any statutory audit under the Companies Act.

The provision creates four categories of mandatory audit:

The Rs 1 Crore vs Rs 10 Crore Twist

Until 2020, the business audit threshold was a flat Rs 1 crore. The Finance Act 2020 introduced a higher threshold of Rs 5 crore (raised to Rs 10 crore by Finance Act 2021) for businesses with limited cash transactions.

The Rs 10 crore relaxation applies if both of these are true:

• Aggregate of all cash receipts during the year is less than 5% of total receipts.
• Aggregate of all cash payments during the year is less than 5% of total payments.

The 5% test is computed at the financial year level. Cheque payments (other than account-payee), bearer cheques and similar near-cash payments are also treated as cash for this test. Account-payee cheques, bank transfers, RTGS, NEFT, UPI and cards are non-cash.

Worked Example

Greenleaf Traders has FY 2025-26 turnover of Rs 6,80,00,000.

• Total receipts (sales + other): Rs 6,90,00,000.
• Cash receipts: Rs 4,20,000.
• Total payments: Rs 6,40,00,000.
• Cash payments: Rs 25,00,000.

Cash receipts as % of receipts: 4,20,000 / 6,90,00,000 = 0.06%. Below 5%, OK. Cash payments as % of payments: 25,00,000 / 6,40,00,000 = 3.9%. Below 5%, OK.

Both tests pass. The threshold for Greenleaf is Rs 10 crore. Turnover of Rs 6.8 crore is below this; tax audit is not required.

If cash payments had been Rs 35,00,000, the percentage would be 5.46%, failing the test. The threshold reverts to Rs 1 crore. Turnover of Rs 6.8 crore exceeds Rs 1 crore: tax audit is required.

Professionals: The Rs 50 Lakh / Rs 75 Lakh Line

For specified professionals (legal, medical, engineering, architectural, accountancy, technical consultancy, interior decoration, and other notified professions), the audit threshold is gross receipts above Rs 50 lakh.

Finance Act 2023 introduced a higher Rs 75 lakh limit for professionals where cash receipts are below 5% of total receipts. There is no separate cash-payment test for professionals.

Professionals using Section 44ADA (presumptive at 50%) escape the audit if their declared profit is at least 50%. If they declare lower, audit is mandatory under Section 44AB(d).

The Presumptive Scheme Trap

Section 44AD, 44ADA and 44AE allow eligible taxpayers to declare a deemed minimum profit and skip detailed bookkeeping. But there is a price for opting out.

• Section 44AD (small businesses): If you opt in, you must declare 6% (digital receipts) or 8% (other) of turnover as profit. If in any year you declare lower, you cannot use 44AD for the next 5 years and audit becomes mandatory if your total income exceeds the basic exemption limit.
• Section 44ADA (professionals): If you opt in, declare 50% of receipts as profit. If you declare lower and income exceeds the basic exemption limit, audit applies.
• Section 44AE (transporters): Declare deemed income per goods vehicle. Lower declaration triggers audit.

The "basic exemption limit" gate matters. If your total income (after all deductions) is below the basic exemption limit (Rs 4,00,000 in the new regime, Rs 2,50,000 in the old regime for individuals below 60), audit is not required even if you declare below the deemed rate.

For our coverage of the presumptive schemes, see Section 44AD presumptive taxation and Section 44ADA for professionals.

What "Turnover" Means

For the Section 44AB threshold, "turnover" follows the ICAI's Guidance Note on Tax Audit:

• For traders: Sales of goods, after sales returns and after trade discounts. Excludes GST collected and refunded.
• For service providers: Gross fees billed (before TDS).
• For commission agents: Only commission income, not the gross value of goods sold on behalf of principals.
• For F&O traders: Absolute value of profits and losses (not net), plus reverse trades. This is a common surprise; an F&O trader with Rs 80 lakh net loss can still have "turnover" above Rs 1 crore.
• For intraday equity: Treated as speculative business, with absolute profits and losses summed.

The classification is not always intuitive. Document the turnover computation carefully in the audit working papers.

Forms 3CA, 3CB and 3CD

The tax audit report consists of two parts:

• Form 3CA if the assessee is required to get accounts audited under any other law (e.g., a company under the Companies Act). The CA reports that the statutory audit was done and refers to that audit report.
• Form 3CB if no other audit is required. The CA does the full audit and gives a true-and-fair view opinion.
• Form 3CD is the statement of particulars (around 44 clauses), filed alongside 3CA or 3CB. This is where the bulk of disclosure happens.

Key clauses in Form 3CD:

• Clauses 17 to 21: Method of accounting, deviations, valuation of inventory.
• Clause 21(b) to 21(d): Disallowable expenditures under Section 40(a), 40A(3) and similar.
• Clause 22: Section 14A disallowance for exempt income.
• Clause 26: Section 43B sums (allowed only on actual payment).
• Clause 31: Loans, deposits, repayment in cash above limits (Section 269SS, 269ST, 269T).
• Clause 32: Brought-forward losses and depreciation.
• Clause 34: TDS compliance details.
• Clause 41: Demands or refunds under any other tax law.

The 3CD is comprehensive precisely because the Department uses it to identify common evasion patterns. Every clause is filed under the CA's signature.

Due Date and Penalty

The tax audit report and 3CD must be filed online on incometax.gov.in/iec/foportal/ by 30 September of the assessment year (one month before the income tax return due date of 31 October for audit cases).

For FY 2025-26 (AY 2026-27): tax audit report due 30 September 2026.

Penalty for non-filing (Section 271B): 0.5% of turnover, capped at Rs 1,50,000. The penalty can be waived if the assessee proves "reasonable cause" (illness of CA, technical glitch on portal, etc.).

The bigger commercial cost is that the ITR cannot be filed before the audit report. A late audit report cascades into a late ITR, with all the associated interest under Section 234A and disqualification from carrying forward losses.

When Tax Audit Is Not Required

• Salaried employees with no business or professional income.
• Businesses with turnover below the threshold.
• Professionals with gross receipts below the threshold.
• Section 44AD users declaring at least 6%/8% of turnover.
• Section 44ADA users declaring at least 50% of receipts.
• Trusts, NGOs and charitable institutions covered by Section 12AB and 10(23C) with their own audit framework, not Section 44AB.

Action Plan for FY 2025-26 Audit

Step-by-Step Guide

Tax Audit Action Plan : FY 2025-26

Six steps to complete your Section 44AB audit and file before the September 30 deadline

1

Review FY 2025-26 Turnover

As soon as books are closed, recompute total turnover. If you are near a threshold, run the 5% cash test on both receipts and payments to determine whether the Rs 1 crore or Rs 10 crore limit applies.

April:May 2026

2

Engage a Chartered Accountant by July 2026

Audit work for a mid-sized business spans 6 to 8 weeks. Engaging late leaves no buffer for queries, missing vouchers, or portal issues.

By July 2026

3

Prepare the Form 3CD Working File

Compile TDS reconciliation, Section 43B payment proofs, related-party transaction details, and the loan/deposit register for Section 269SS/269T disclosures.

July:August 2026

4

Complete Books Closure

Finalise GST returns, bank reconciliation, and outstanding provisions before the auditor begins. Unreconciled differences discovered mid-audit cause delays.

By August 2026

5

Track the September 30 Deadline

The income tax portal slows in late September. Target uploading the audit report by September 25 to avoid last-minute technical failures. Penalty under Section 271B is 0.5% of turnover, capped at Rs 1,50,000.

By 25 Sept 2026

6

File ITR by October 31

Once the audit report (Form 3CA/3CB + 3CD) is filed, use the audit particulars to complete and file the income tax return. The ITR due date for audit cases is October 31.

By 31 Oct 2026

Source: Section 44AB and Section 271B, Income Tax Act 1961

1. Review FY 2025-26 turnover as soon as books are closed. If you are close to a threshold, recompute including the 5% cash test.
2. Engage a Chartered Accountant by July 2026. Audit work spans roughly 6 to 8 weeks for a mid-sized business; last-minute engagement leaves no buffer.
3. Prepare the 3CD working file: TDS reconciliation, Section 43B payments, related-party transactions, loan and deposit register (for Section 269SS/T disclosure).
4. Complete books closure and finalise GST returns and bank reconciliation before the auditor begins.
5. Track the September 30 deadline. The portal can be slow in late September; uploads should be done by September 25 if possible.
6. File ITR by October 31 using the audit report particulars.

Common Errors

• Treating turnover as net of returns and discounts incorrectly. Trade discounts at the time of sale are netted; cash discounts later are not.
• Missing the 5% cash test. Just because turnover is below Rs 10 crore does not mean audit is exempt; the cash test must pass.
• Assuming Section 44AD covers all cases. 44AD has its own eligibility (resident individual, HUF, partnership firm; not LLP, not specified professionals).
• Filing 3CB when 3CA was needed. Companies subject to statutory audit always need 3CA, not 3CB. The CA's report format must match the assessee type.
• Late filing by even one day. Penalty under 271B is automatic. Avoid by filing September 25 to 28.

Where Tax Garden Helps

For SMEs and professionals approaching the Rs 1 crore / Rs 50 lakh thresholds, the difference between a smooth tax audit and a chaotic one is preparation that starts in July, not late September. Tax Garden's tax compliance services coordinate with your CA on the 3CD working papers, ensure TDS, GST and Section 43B reconciliations are clean, and keep the September 30 deadline visible. We also handle ITR preparation and filing immediately after the audit report is signed.

For related reading, see our Section 44AD presumptive taxation guide and Section 44ADA for professionals.

Frequently Asked Questions

What is the tax audit threshold for businesses for FY 2025-26?

Rs 1 crore of turnover. The threshold rises to Rs 10 crore if both cash receipts and cash payments are each less than 5% of the corresponding totals during the financial year.

Does tax audit apply to LLPs and companies?

Yes, if the threshold is crossed. The audit framework is the same. Companies that already undergo a statutory audit under the Companies Act file Form 3CA (instead of 3CB) along with Form 3CD.

What if I declare lower profit than the Section 44AD presumptive rate?

If you opt out of 44AD by declaring less than 6%/8%, you must get a tax audit if your total income exceeds the basic exemption limit. You also lose access to 44AD for the next 5 years.

Is GST audit different from tax audit under Section 44AB?

Yes. The GST audit framework (Section 35(5) read with Form 9C) is separate. Section 44AB is purely an income tax compliance. The two thresholds and procedures do not overlap.

What is the penalty for missing the tax audit deadline?

Section 271B imposes a penalty of 0.5% of turnover or gross receipts, capped at Rs 1,50,000. The penalty can be waived for reasonable cause but is otherwise automatic. Late audit also delays ITR filing and triggers Section 234A interest.

Does an F&O trader need tax audit?

Possibly. Turnover for F&O is computed as the absolute value of profits and losses (not net). If this turnover crosses Rs 1 crore (or Rs 10 crore with the 5% cash test), audit is required. Many F&O traders are surprised by this calculation.

Sources

This guide is verified against Section 44AB, Section 44AD, Section 44ADA, Section 44AE, Section 271B of the Income Tax Act 1961, and the ICAI Guidance Note on Tax Audit (latest revision). Confirmatory practitioner coverage from ClearTax, IndiaFilings, TaxGuru and CAClubIndia was reviewed for current threshold positions and 3CD clause interpretation. Always validate the latest threshold and form requirements against the Income Tax Department's filing utility on incometax.gov.in/iec/foportal/ before engaging an auditor.