Tax Audit Under Section 63 of the Income-tax Act, 2025: Turnover Thresholds, 5% Cash Test and Compliance Guide

Tax Audit Under Section 63 (Successor to Section 44AB): Turnover Thresholds and the Cash Payment Limit

A practitioner’s walk-through of Section 63 of the Income-tax Act, 2025 — the mandatory tax audit provision replacing Section 44AB — with focus on turnover thresholds, the enhanced limit for low-cash businesses, and the common errors in cash payment testing.

Section 63 of the Income-tax Act, 2025 is the direct successor to Section 44AB of the 1961 Act — the mandatory tax audit provision. The framework has been substantially preserved in the 2025 Act with the language cleaned up, cross-references consolidated, and the digital-transaction incentive retained. For practitioners handling audit engagements from Tax Year 2026-27 onward, the mechanics are familiar but a few operational realities deserve attention. Here is the practitioner-level walk-through.

The turnover thresholds in 2026

The baseline thresholds under Section 63 are:

• Business — ₹1 crore of turnover, gross receipts, or sales in the tax year.
• Profession — ₹50 lakh of gross receipts in the tax year.

The enhanced thresholds available where cash transactions are below the 5% test:

• Business — ₹10 crore of turnover, if aggregate cash receipts during the tax year do not exceed 5% of aggregate receipts AND aggregate cash payments do not exceed 5% of aggregate payments.
• Profession — ₹75 lakh of gross receipts, applying the same 5% cash test.

The intent of the enhanced threshold is to reward businesses that have moved substantially to digital transactions. In practice, meeting the test requires disciplined tracking of every cash inflow and outflow across the year — not just an annual estimate.

The 5% cash test — where practitioners most often get it wrong

The cash payment and receipt test looks simple in the statute but is operationally tricky. Common errors I now audit for on every tax audit engagement:

• Aggregation errors — the 5% test applies to aggregate cash payments as a percentage of aggregate total payments, not to individual counter-parties.
• Missed cash items — utility payments, small vendor payments, cash salary, cash reimbursements, petty cash top-ups. All add up.
• Bearer cheques treated as non-cash — bearer cheques are treated as cash for this test.
• Reversal entries not excluded — where a cash receipt was subsequently refunded, both entries need appropriate treatment.
• Cash utility bills and government fees not included — even genuine cash payments to government authorities count against the taxpayer.
• Employee reimbursements paid in cash not tracked — these are payments by the business regardless of the underlying nature.

A single missed category can push a taxpayer over the 5% ceiling and trigger the standard threshold, which for a business with ₹4 crore turnover means an audit is suddenly mandatory where none was expected.

Who else is covered by Section 63

Beyond the standard turnover thresholds, several other categories are within Section 63:

• Presumptive scheme opt-outs — taxpayers who had opted for presumptive taxation under the 2025 Act’s successor to Sections 44AD or 44ADA and are now declaring lower profits than the presumptive rate, if their income exceeds the basic exemption limit.
• Loss cases — businesses declaring losses may still trigger the audit requirement depending on turnover.
• Non-resident businesses with an Indian PE — the audit applies to the Indian permanent establishment.
• Certain trusts and Section 8 companies where turnover thresholds are met.

The audit deliverables

• Form 3CA where the accounts are already audited under any other law (Companies Act, Society Registration Act, etc.).
• Form 3CB where the accounts are audited by the tax auditor for the first time.
• Form 3CD — the statement of particulars in 40+ clauses, filed alongside the audit report.
• Auditor’s observations and qualifications where applicable.
• UDIN of the tax auditor to be quoted on all forms.

Due date and penalty consequences

Tax audit reports must be filed by 30 September of the assessment year — i.e. for Tax Year 2026-27, by 30 September 2027. Failure to file attracts penalty under the 2025 Act at 0.5% of turnover or ₹1.5 lakh, whichever is less. In practice, the harder consequence is often the inability to file a valid ITR that requires tax audit, which then triggers reassessment risk under Section 280.

Practical audit planning for Tax Year 2026-27

For SME clients likely to be near the ₹10 crore business threshold or ₹75 lakh professional threshold, the practitioner’s planning framework I now use:

1. Confirm at the start of the year whether the client intends to satisfy the 5% cash test — this drives operational discipline all year.
2. Set up a monthly cash-transaction summary — total cash payments, total cash receipts, total payments, total receipts.
3. Run a mid-year projection in October to confirm the 5% test is on track.
4. If the test is at risk, tighten cash controls in the second half — this is where late-year discipline actually moves the needle.
5. Year-end reconciliation with disclosed workings — the audit file should contain the calculation, not just the conclusion.

Coordination with the financial audit

For companies where the financial audit under the Companies Act is done by one firm and the tax audit by another, coordination is essential. The tax auditor cannot rely uncritically on financial audit workings — the definitions in Section 63 and CARO 2020 do not always align. A joint reconciliation meeting before both audits close saves substantial time and prevents conflicting audit conclusions.

2026 practitioner tips

• Automate cash-transaction tracking where possible — banking software integrations can now identify cash transactions in near real time.
• Educate the client at the start of Tax Year, not at the end. The audit implications of the 5% test are behavioural, not documentary.
• For clients near the threshold, prepare a Section 63 applicability memorandum documenting the analysis. This is your file evidence if the position is later questioned.
• Do not treat Form 3CD as boilerplate — recent departmental scrutiny has increased on specific clauses (loans, related party transactions, deemed dividend indicators).

Closing action list

• Assess each client’s Section 63 applicability at the start of Tax Year 2026-27, not near the due date.
• For businesses near the ₹1 crore–₹10 crore band, model the 5% cash test carefully.
• Maintain contemporaneous cash-transaction records — you cannot reconstruct them in September.
• File Form 3CA/3CB and Form 3CD by 30 September to preserve ITR validity.
• Document the applicability memorandum in the audit working papers.

Section 63 preserves the operational architecture of Section 44AB while cleaning up cross-references and language. For practitioners, the important shift is not in the statute — it is in the discipline of applying the 5% cash test through the year rather than reconstructing it at audit time. Clients who understand this early stay in the enhanced threshold. Clients who don’t, find themselves in a mandatory audit they could have avoided.