Tax Audit Applicability: Limits, Due Dates and Filing Rules

Introduction

Tax Audit Applicability determines whether a business or professional is required to get its books of accounts audited for income-tax purposes. The requirement depends on factors such as annual turnover, gross receipts, cash receipts and payments, the nature of the business or profession, and the applicability of presumptive taxation provisions.

The income-tax framework has also changed from 1 April 2026. Under the Income Tax Act, 2025, tax audit is covered under Section 63, while presumptive taxation provisions are consolidated under Section 58. The Income Tax Rules, 2026 have also introduced Form 26 will apply for tax audit reporting requirements under the Income Tax Act, 2025 from Tax Year 2026-27 onward.

However, tax audits relating to FY 2025-26 / AY 2026-27 continue under the Income-tax Act, 1961. Therefore, Forms 3CA, 3CB and 3CD remain relevant for AY 2026-27.

This blog explains the applicable limits, presumptive taxation rules, forms, due dates, penalties, and the filing process.

When Does Tax Audit Apply to a Business or Professional?

Tax Audit Applicability depends primarily on turnover or gross receipts and the nature of activity carried on by the taxpayer.

Under the Income Tax Act, 2025, tax audit requirements are contained in Section 63. The basic turnover and receipt thresholds remain broadly aligned with the earlier Section 44AB framework.

The main factors to consider are:

• Annual business turnover
• Professional gross receipts
• Percentage of cash receipts
• Percentage of cash payments
• Eligibility for presumptive taxation
• Income declared under the applicable scheme

For a detailed understanding of the earlier provisions, you can read our guide on Tax Audit under Section 44AB of the Income Tax Act

What Are the Tax Audit Turnover Limits?

The general thresholds are:

When Can the ₹10 Crore Business Limit Apply?

• The normal tax audit threshold for a business is ₹1 crore.
• This limit can increase to ₹10 crore where both of the following conditions are satisfied:
• Cash receipts do not exceed 5% of aggregate receipts.
• Cash payments do not exceed 5% of aggregate payments.
• Both conditions must be checked separately.

It is therefore not accurate to rely only on the percentage of digital sales. A business may have mostly digital receipts but still fail the cash payment condition.

Example: Does the ₹10 Crore Limit Apply?

Suppose a business has the following figures:

Since both cash receipts and cash payments are within the prescribed 5% limit, the enhanced threshold may apply.

What if cash payments are 8%?

The business would not satisfy the cash payment condition for the enhanced ₹10 crore threshold.

How Does Presumptive Taxation Affect Tax Audit?

Presumptive taxation can change the way tax audit requirements are determined.

Under the earlier law, separate provisions existed under Sections 44AD, 44ADA, and 44AE. Under the Income Tax Act, 2025, these provisions are consolidated under Section 58.

Presumptive Scheme for Eligible Businesses

For eligible businesses, the relevant turnover limits are generally:

• ₹2 crore under the normal limit
• ₹3 crore where the prescribed cash-receipt condition is satisfied

Presumptive Scheme for Eligible Professionals

For eligible specified professionals, the relevant gross-receipt limits are generally:

• ₹50 lakh under the normal limit
• ₹75 lakh where the prescribed cash-receipt condition is satisfied

Tax audit applicability in presumptive taxation cases depends on the specific presumptive scheme, the taxpayer’s eligibility, turnover or gross receipts, and the income declared under the applicable provision. The audit requirement should therefore be examined separately based on the conditions applicable to the relevant presumptive taxation scheme.

What Is the Tax Audit Due Date for AY 2026-27?

CBDT announced an extension on 28 September 2026 for specified taxpayers covered by the audit provisions.

For the covered audit cases:

The extension applies to the specified category of taxpayers covered by the CBDT announcement.

Separate timelines, including transfer pricing cases, should be checked independently instead of assuming that every audit-related deadline has been extended.

How to Prepare and File a Tax Audit Report?

1. Check Whether Tax Audit Applies

Review:

• Turnover
• Gross receipts
• Cash receipts
• Cash payments
• Nature of business or profession
• Presumptive taxation eligibility

2. Finalize the Books of Accounts

Keep the relevant accounting records ready, including:

• Trial balance
• Ledgers
• Sales and purchase records
• Bank statements
• Expense records
• Fixed asset details
• GST records
• TDS records
• Loan details

3. Complete Financial Reconciliations

Reconcile the books with:

• Bank statements
• GST returns
• TDS records
• Sales and purchase data
• Outstanding balances

Any material differences should be identified before the audit is finalized.

4. Appoint an Eligible Chartered Accountant

A tax audit must be conducted and certified by an eligible Chartered Accountant under the applicable income-tax provisions.

5. Prepare the Applicable Audit Form

For AY 2026-27, Form 3CA or Form 3CB is filed along with Form 3CD.

For Tax Year 2026-27 onward, Form 26 applies.

For AY 2026-27, taxpayers can also understand the reporting requirements through our guide on Form 3CB and Form 3CD

6. Submit the Audit Report Online

The Chartered Accountant uploads the applicable audit report through the Income Tax e-Filing Portal.

The taxpayer should review and complete the required acceptance or other action through the portal.

Prepare Your Books Before the Tax Audit Deadline

Incomplete books, unreconciled GST figures, differences in TDS records and missing invoices can delay the tax audit process. Businesses and professionals should therefore review their accounting records well before the applicable due date.

Ebizfiling can assist with:

• Reviewing information relevant to Tax Audit Applicability
• Finalizing books of accounts
• Bank, GST and TDS reconciliations
• Organizing audit-supporting records
• Coordinating documents required for tax audit
• Assisting with the related Income Tax Return
• Tracking applicable tax audit and ITR timelines

Get support with tax audit documentation, books reconciliation, audit coordination, and Income Tax Return filing. Ebizfiling can help you complete the required compliances within the applicable timelines.

Conclusion

Tax Audit Applicability depends on more than the basic ₹1 crore business turnover threshold. Cash receipts, cash payments, professional receipts, and presumptive taxation provisions can affect whether an audit is required.

For AY 2026-27, Forms 3CA/3CB and 3CD continue to apply, and the specified audit report deadline has been extended to 21 October 2026. From Tax Year 2026-27 onward, tax audit is governed by Section 63 and reported through Form 26.

Frequently Asked Questions