Tax audit is an important compliance requirement for businesses and professionals that fall within the scope of Section 44AB of the Income-tax Act, 1961. For Assessment Year (AY) 2026-27, businesses should understand the applicable thresholds, filing deadlines and the difference between Forms 3CA, 3CB and 3CD before completing their income tax return.

AY 2026-27 relates to income earned during Financial Year 2025-26, from 1 April 2025 to 31 March 2026. Although the Income-tax Act, 2025 came into effect from 1 April 2026, the tax audit requirements for FY 2025-26 continue to follow the provisions applicable to that financial year.

The Income Tax Department states that the tax audit report for AY 2026-27 is generally due on 30 September 2026 for taxpayers whose income tax return is due on 31 October 2026.

Tax Audit Due Date for AY 2026-27

For taxpayers covered by Section 44AB, the tax audit report generally needs to be furnished one month before the due date for filing the income tax return.

These dates should be checked against any subsequent notification or extension issued by the Central Board of Direct Taxes (CBDT).

Businesses should therefore avoid waiting until the final days of September. Financial records, GST data, TDS information, statutory payments and other tax-related details should be reviewed well before the audit report is filed.

What Is Tax Audit Under Section 44AB?

A tax audit is an examination of the books of accounts and specified financial and tax information of a taxpayer by a Chartered Accountant.

The objective is to ensure that relevant information is properly examined and reported to the Income Tax Department.

Depending on the business, the audit may involve reviewing:

• Sales and turnover

• Books of accounts

• Business expenses

• Depreciation

• Loans and advances

• TDS and TCS compliance

• Statutory payments

• Related-party transactions

• GST-related information

• Payments to MSMEs

• Specified deductions

• Other particulars required under Form 3CD

The tax audit report is furnished electronically through the Income Tax e-Filing portal by the Chartered Accountant assigned by the taxpayer.

Who Is Required to Get a Tax Audit?

Tax audit applicability depends on the nature of the taxpayer, turnover or receipts and the provisions applicable to the business or profession.

Tax Audit Limit for Business

For businesses, the general threshold under Section 44AB is ₹1 crore in total sales, turnover or gross receipts.

However, the threshold can increase to ₹10 crore where the prescribed conditions relating to cash receipts and cash payments are satisfied.

Generally, the higher threshold applies where:

• Cash receipts do not exceed 5% of total receipts; and

• Cash payments do not exceed 5% of total payments.

Therefore, a business should not determine tax audit applicability solely by looking at its annual turnover.

For example, a business with turnover of ₹7 crore may not necessarily require a tax audit under the general turnover test if it satisfies the conditions for the higher threshold.

Tax Audit Limit for Professionals

For professionals, the general tax audit threshold is ₹50 lakh in gross receipts.

Professionals covered by specified provisions may include lawyers, doctors, engineers, architects, accountants, technical consultants and other notified professions.

However, additional provisions relating to presumptive taxation can affect whether an audit is required.

Does Presumptive Taxation Affect Tax Audit?

Yes.

Businesses and professionals using presumptive taxation provisions such as Sections 44AD, 44ADA or 44AE need to consider the specific conditions applicable to their circumstances.

Tax audit requirements can arise in certain situations where the taxpayer:

• Declares income below the prescribed presumptive income;

• Does not satisfy the conditions of the presumptive scheme; or

• Falls under other provisions that trigger audit requirements.

Therefore, checking turnover alone is not always sufficient.

A proper tax audit assessment should consider the taxpayer's business type, turnover, cash transactions, presumptive taxation status and income declared.

Form 3CA vs Form 3CB: What Is the Difference?

Once a taxpayer is found to be liable for tax audit, the next question is which audit report applies.

The two primary audit report formats are Form 3CA and Form 3CB.

What Is Form 3CA?

Form 3CA is generally applicable when the taxpayer's accounts are already required to be audited under another law.

For example, a company whose financial statements are subject to statutory audit under the Companies Act may also be required to undergo tax audit under Section 44AB.

In such cases, Form 3CA is accompanied by Form 3CD.

What Is Form 3CB?

Form 3CB applies when the taxpayer is subject to tax audit under Section 44AB but is not required to get the accounts audited under another law.

A proprietorship meeting the applicable tax audit conditions is a common example.

Form 3CB is also accompanied by Form 3CD.

What Is Form 3CD?

Form 3CD is the detailed statement of particulars that accompanies Form 3CA or Form 3CB.

It contains information relating to various aspects of the taxpayer's business, accounts and tax compliance.

The form can cover areas such as:

• Accounting methods

• Books of accounts

• Business activities

• Turnover and receipts

• Depreciation

• Disallowable expenses

• Statutory payments

• Related-party transactions

• Loans and deposits

• TDS and TCS

• GST-related information

• Specified deductions

• Tax liabilities

• Other prescribed disclosures

The Income Tax Department continues to provide Form 3CA-3CD and Form 3CB-3CD for AY 2026-27.

Important Reconciliations Before Tax Audit Filing

A business should prepare its records before the CA begins the final tax audit review.

Reconcile Turnover With GST Records

Compare turnover reported in the books with the relevant GST returns and accounting records.

Any difference should be identified and properly explained.

Review TDS and TCS

Check TDS and TCS deductions, deposits, returns and ledger entries.

Unresolved differences can create compliance issues during the audit process.

Check AIS and Form 26AS

Review information available through the Annual Information Statement (AIS) and Form 26AS.

This can help identify differences in reported income, TDS, TCS and other tax information.

Review Statutory Payments

Check outstanding statutory liabilities and payments that may affect the tax treatment of expenses.

Particular attention should be given to expenses covered by the applicable provisions governing deductions for statutory payments.

Check MSME Payments

Businesses should review outstanding payments to eligible micro and small enterprises and determine whether payment timelines can affect tax deductibility.

Review Related-Party Transactions

Transactions with directors, related parties or specified persons should be reviewed and appropriately reported wherever required.

Verify Loans and Deposits

Check loans, deposits and other specified transactions against the applicable reporting requirements.

Tax Audit Compliance Checklist for Businesses

Before submitting the tax audit report, businesses can use the following checklist:

• Finalise books of accounts

• Reconcile sales and turnover

• Match accounting data with GST records

• Review TDS and TCS compliance

• Check AIS and Form 26AS

• Review statutory liabilities and payments

• Verify depreciation calculations

• Review related-party transactions

• Check loans and deposits

• Review MSME outstanding payments

• Identify disallowable expenses

• Verify applicable deductions

• Prepare information required for Form 3CD

• Share supporting documents with the Chartered Accountant

• Review the final audit report

• Ensure the report is furnished within the prescribed deadline

• File the applicable income tax return within its due date

What Happens If Tax Audit Is Not Completed on Time?

Failure to comply with tax audit requirements can result in consequences under the Income-tax Act.

Where a taxpayer is required to obtain a tax audit but fails to do so within the prescribed timeline, the applicable penalty provisions may need to be considered.

Under Section 271B of the Income-tax Act, a penalty can generally be imposed for failure to get accounts audited or furnish the audit report as required.

The penalty can be 0.5% of total sales, turnover or gross receipts, subject to the prescribed maximum limit.

However, penalty provisions can have exceptions where the taxpayer establishes a reasonable cause for the failure. The specific facts of the case should therefore be reviewed before determining the consequence.

Tax Audit vs Statutory Audit

Tax audit and statutory audit are not necessarily the same thing.

A statutory audit primarily examines whether the financial statements present a true and fair view under the applicable corporate or other law.

A tax audit focuses on reporting prescribed information under income-tax provisions.

A company may therefore have a statutory audit requirement and a separate tax audit requirement.

This is also one of the reasons why companies subject to audit under another law generally use Form 3CA along with Form 3CD when tax audit under Section 44AB applies.

Tax Audit and New Income-Tax Law: What Changes for AY 2026-27?

The transition to the Income-tax Act, 2025 has created some confusion around tax audit forms.

For AY 2026-27, businesses are dealing with income earned during FY 2025-26. The applicable tax audit framework for this assessment year continues under the Income-tax Act, 1961.

The new tax audit Form 26 is relevant to future tax audit reporting under the new framework and does not replace Forms 3CA, 3CB and 3CD for AY 2026-27.

Businesses should therefore avoid applying the new forms retrospectively to the FY 2025-26 tax audit.

How Companies Can Prepare for Tax Audit

Tax audit becomes easier when compliance records are maintained throughout the year rather than prepared at the last minute.

Companies should maintain:

• Updated books of accounts

• Proper invoices and supporting documents

• GST records

• TDS/TCS records

• Bank statements

• Expense documentation

• Payroll records

• Statutory payment records

• Loan and investment documentation

• Related-party transaction records

• Corporate and tax compliance documents

A structured compliance process can reduce reconciliation issues and help the finance team provide accurate information to the Chartered Accountant.

Tax audit compliance for AY 2026-27 requires more than checking annual turnover. Businesses need to evaluate Section 44AB applicability, understand the relevant threshold, determine whether Form 3CA or Form 3CB applies and prepare the information required in Form 3CD.

With the general tax audit deadline falling on 30 September 2026, companies should complete their financial and tax reconciliations well in advance.

For businesses setting up or managing an Indian company, maintaining proper accounting, taxation and statutory compliance from the beginning can make future filings significantly easier.