Tax Audit Applicability for FY 2025-26: Who Must File by September 30, 2026 (Section 44AB Limits, the Rs 10 Crore Test and the Presumptive Trap)
The single most common question a Chartered Accountant hears in September is deceptively simple: do I actually need a tax audit this year? For the financial year 2025-26 (assessment year 2026-27), the answer turns on Section 44AB of the Income-tax Act, 1961, and the audit report is due by September 30, 2026. Get the applicability test wrong in either direction and the cost is real: a needless audit fee if you over-apply it, or a penalty under Section 271B if you miss an audit you were required to file. This is the plain-English guide to tax audit applicability for FY 2025-26, the turnover limits, the Rs 10 crore digital test and the presumptive-scheme trap that catches founders every year.
Quick Summary: Tax Audit Applicability for FY 2025-26
- Business turnover limit: A tax audit under Section 44AB is required if business turnover exceeds Rs 1 crore in FY 2025-26.
- The Rs 10 crore digital test: The limit rises to Rs 10 crore where both cash receipts and cash payments are 5% or less of the respective totals.
- Profession limit: A professional needs a tax audit if gross receipts exceed Rs 50 lakh. The Rs 10 crore relaxation does not apply to professions.
- The presumptive trap: Declaring income below the Section 44AD (6%/8%) or Section 44ADA (50%) presumptive rate, with total income above the basic exemption, triggers a compulsory audit even at low turnover.
- Due date: The audit report (Form 3CA/3CB and Form 3CD) must be filed by September 30, 2026. The penalty for default under Section 271B is 0.5% of turnover, capped at Rs 1,50,000.
What Is a Tax Audit and Who Governs It for FY 2025-26?
A tax audit is an examination of your books of account by a Chartered Accountant, reported to the Income Tax Department in the prescribed forms. For FY 2025-26, the governing law is the Income-tax Act, 1961. This matters, because the Income-tax Act, 2025 came into force on April 1, 2026 and governs FY 2026-27 onward. The audit you are filing now, for the year ended March 31, 2026, is squarely a 1961-Act filing. The successor provision under the new Act (Section 63, “Tax audit”) applies only from the tax year 2026-27.
Section 44AB opens with the words: “Every person, (a) carrying on business shall, if his total sales, turnover or gross receipts, as the case may be, in business exceed or exceeds one crore rupees in any previous year”. The obligation is to “get his accounts of such previous year audited by an accountant before the specified date and furnish by that date the report of such audit in the prescribed form.” (Source: incometaxindia.gov.in/w/section-44ab-38, Income-tax Act 1961, retrieved September 22, 2026.)
The Business Turnover Test: Rs 1 Crore or Rs 10 Crore?
This is where most founders slip. Section 44AB has a proviso that raises the audit threshold from Rs 1 crore to Rs 10 crore, but only if you clear a strict two-part cash test. The proviso provides that where:
- (a) the aggregate of all amounts received, including for sales, turnover or gross receipts, in cash does not exceed 5% of the total receipts; and
- (b) the aggregate of all payments made, including expenditure, in cash does not exceed 5% of the total payments,
then “one crore rupees” is read as “ten crore rupees“. (Source: incometaxindia.gov.in/w/section-44ab-38, retrieved September 22, 2026.)
Both limbs must be satisfied. A business with 4% cash receipts but 8% cash payments fails the test and stays on the Rs 1 crore threshold. For this purpose, digital and banking receipts and payments are the safe side; genuine physical cash is what erodes the 5% headroom. Note that account-payee cheques, bank drafts and electronic modes count as non-cash.
| Taxpayer | Threshold for FY 2025-26 | Condition |
|---|---|---|
| Business (default) | Rs 1 crore turnover | Standard rule |
| Business (digital) | Rs 10 crore turnover | Cash receipts AND cash payments each 5% or less |
| Profession | Rs 50 lakh gross receipts | No digital relaxation available |
The Profession Limit: Rs 50 Lakh, No Exceptions
Section 44AB(b) requires an audit for “carrying on profession shall, if his gross receipts in profession exceed fifty lakh rupees in any previous year”. There is no Rs 10 crore relaxation for professionals: doctors, lawyers, architects, consultants, technical and accountancy professionals covered by Section 44AA(1) cross into audit territory at Rs 50 lakh of gross receipts regardless of whether they receive their fees digitally. (Source: incometaxindia.gov.in/w/section-44ab-38, retrieved September 22, 2026.)
The Presumptive-Scheme Trap: How Low Turnover Still Triggers an Audit
The most misunderstood route into a tax audit has nothing to do with the Rs 1 crore line. It is the presumptive taxation scheme.
Section 44AD for business
Section 44AD deems profits at 8% of turnover (6% for receipts through banking or electronic modes) for an eligible resident business with turnover up to Rs 2 crore. That limit is read as Rs 3 crore where cash receipts do not exceed 5% of turnover. (Source: incometaxindia.gov.in/w/section-44ad-31, retrieved September 22, 2026.)
The trap sits in sub-sections (4) and (5). If you declare presumptive income one year and then, within the next five assessment years, declare profit lower than the presumptive rate, Section 44AD(4) locks you out of the scheme for five years, and Section 44AD(5) then requires you to “keep and maintain such books of account … and get them audited … as required under section 44AB”, provided your total income exceeds the basic exemption limit. This is echoed in Section 44AB(e), which pulls a taxpayer into audit “if the provisions of sub-section (4) of section 44AD are applicable in his case and his income exceeds the maximum amount which is not chargeable to income-tax”.
Section 44ADA for professionals
Section 44ADA deems 50% of gross receipts as income for a resident individual or firm (not an LLP) carrying on a Section 44AA(1) profession with gross receipts up to Rs 50 lakh, read as Rs 75 lakh where cash receipts are 5% or less. If you declare profits below 50% and your total income exceeds the basic exemption, Section 44ADA(4) requires you to get the accounts audited under Section 44AB, mirrored in Section 44AB(d). (Source: incometaxindia.gov.in/w/section-44ada-9, retrieved September 22, 2026.)
The practical takeaway: a freelancer with Rs 30 lakh of receipts who honestly declares a 35% margin, or a trader below Rs 2 crore who declares 4% net profit, can be pulled into a full tax audit despite modest turnover. The audit is triggered by the low declared margin, not the size of the business.
The September 30, 2026 Deadline and the Section 271B Penalty
For a taxpayer who is required to get accounts audited, the tax audit report for FY 2025-26 must be filed by September 30, 2026, and the income tax return follows by October 31, 2026. Transfer pricing cases under Section 92E file the audit report by October 31, 2026 and the return by November 30, 2026.
Miss the audit and Section 271B applies. It provides that the Assessing Officer “may direct that such person shall pay, by way of penalty, a sum equal to one-half per cent of the total sales, turnover or gross receipts … or a sum of one hundred fifty thousand rupees, whichever is less.” (Source: incometaxindia.gov.in/w/section-271b-29, Income-tax Act 1961, retrieved September 22, 2026.) In practice the penalty is 0.5% of turnover, capped at Rs 1,50,000, though it can be waived under Section 273B if there was reasonable cause.
Tax Audit Applicability Checklist for FY 2025-26
- Compute exact turnover for the year ended March 31, 2026 (net of GST where separately shown, per the ICAI Guidance Note).
- Business over Rs 1 crore? If yes, test the two cash limbs. Both cash receipts and cash payments 5% or less pushes your limit to Rs 10 crore.
- Profession over Rs 50 lakh? If yes, audit applies. No digital relaxation.
- On presumptive tax? Check whether your declared margin is below 6%/8% (Section 44AD) or 50% (Section 44ADA) and whether total income exceeds the basic exemption. If both, an audit is triggered.
- Appoint the auditor and share the trial balance, ledgers, GST returns and TDS returns early. The auditor reports across Form 3CD, including the disallowance clauses discussed on TaxUpdate.in.
- File by September 30, 2026, then the return by October 31, 2026.
Frequently Asked Questions
Is the tax audit due date for FY 2025-26 September 30 or October 31, 2026?
The tax audit report (Form 3CA/3CB with Form 3CD) is due September 30, 2026. The related income tax return for audit cases is then due October 31, 2026. Transfer pricing cases have later dates (October 31 and November 30, 2026 respectively).
Does the Rs 10 crore limit apply to professionals?
No. The Rs 10 crore digital threshold is available only for business turnover under Section 44AB. Professionals remain subject to the Rs 50 lakh gross receipts limit irrespective of mode of receipt.
Can a business below Rs 1 crore still need a tax audit?
Yes. If the business was on the Section 44AD presumptive scheme, declares profit below the presumptive rate within the five-year window, and total income exceeds the basic exemption, Section 44AD(5) read with Section 44AB(e) requires an audit even below Rs 1 crore.
What is the penalty for not filing the tax audit report?
Under Section 271B, 0.5% of turnover or gross receipts, subject to a maximum of Rs 1,50,000, whichever is lower. It can be waived under Section 273B for reasonable cause.
Does the Income-tax Act 2025 change tax audit for this year?
Not for FY 2025-26. The audit you file now is governed by the 1961 Act. The Income-tax Act 2025 (Section 63, “Tax audit”) governs FY 2026-27 onward. (Source: incometaxindia.gov.in/w/section-63-130, Income-tax Act 2025, retrieved September 22, 2026.)
The Bottom Line
Tax audit applicability for FY 2025-26 is a three-question test: is business turnover above Rs 1 crore (or Rs 10 crore on the digital test), is professional gross receipt above Rs 50 lakh, or has a presumptive taxpayer declared a below-threshold margin with income above the basic exemption? Answer all three before September 30, 2026, and you avoid both the wasted audit fee and the Section 271B penalty. For the disallowance clauses your auditor will scrutinise, see our companion pieces on the Form 3CD clauses founders and CAs get wrong, the Section 43B(h) MSME payment disallowance, and Section 40(a)(ia) TDS disallowance.
Working through your tax audit applicability for FY 2025-26 and want a second opinion before September 30? Tax Update India publishes practitioner-grade analysis for founders, CAs and finance teams. Bookmark TaxUpdate.in and forward this note to the person on your team running the audit file today.
Disclaimer: This article is for general information only and does not constitute tax or legal advice. Statutory provisions have been cited from primary sources as retrieved on September 22, 2026. Applicability depends on your specific facts. Please consult a qualified professional before acting.
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- Section 40A(3) Cash Payment Disallowance in the September 30, 2026 Tax Audit: The Rs 10,000 Rule, Rule 6DD Exceptions and the Move to Section 36 of the Income-tax Act 2025 - September 22, 2026
- Tax Audit Applicability for FY 2025-26: Who Must File by September 30, 2026 (Section 44AB Limits, the Rs 10 Crore Test and the Presumptive Trap) - September 22, 2026
- Form 3CD Clauses Founders and CAs Get Wrong in the September 30, 2026 Tax Audit (and the Move to Form 26 Under the Income-tax Act 2025) - September 18, 2026