Tax Audit Under Section 44AB For AY 2026-27: Latest Rules with Due Date, Forms and Penalty

Section 44AB of the Income Tax Act is the foundational provision for tax compliance among businesses and professionals in India, as it mandates a compulsory tax audit once specified financial thresholds are exceeded. In essence, this legal requirement obliges taxpayers whose turnover or gross receipts cross certain limits to have their accounts formally examined and certified by a practicing Chartered Accountant.

This audit fulfils a twofold objective: it offers the taxpayer a professional evaluation of their financial position, while also providing the tax authorities with assurance regarding the correctness of the declared income.

Whether you are a small trader with a turnover of ₹1.5 crore or a professional earning ₹60 lakhs, a thorough understanding of the applicability, the detailed turnover limits, including the special concession of ₹10 crore for transactions conducted largely through digital means, and the critical filing deadlines in September and October is essential to ensure smooth compliance and to avoid penal action under the Act.

Eligibility & Threshold Limits 

Businesses 

Standard Threshold 

• A tax audit is mandatory if total sales, turnover, or gross receipts exceed ₹1 Crore in a financial year. 

Enhanced Digital Threshold (₹10 Crore) 

The threshold is raised to ₹10 Crores provided both of the following conditions are satisfied simultaneously: 

• Aggregate cash receipts do not exceed 5% of total receipts. 
• Aggregate cash payments do not exceed 5% of total payments. 

Presumptive Taxation (Section 44AD) 

• Threshold: This scheme is available for turnover up to ₹2 Crores (or ₹3 Crores if cash receipts do not exceed 5%). 
• Audit Trigger: An audit becomes compulsory if an eligible taxpayer declares profits below the prescribed rate (6% or 8%) and their total income exceeds the basic exemption limit. 

5-Year Lock-in Rule (Section 44AD(4)) 

• If a taxpayer opts out of the 44AD scheme within five years of having opted in, they are disqualified from using the scheme for the next five consecutive years. During this five-year period, a tax audit is mandatory if their income exceeds the basic exemption limit, irrespective of turnover. 

Professionals 

Standard Threshold 

• A tax audit is mandatory if gross receipts exceed ₹50 Lakhs in a financial year. 

Presumptive Taxation (Section 44ADA) 

• Threshold: This scheme is available for professionals with gross receipts up to ₹50 Lakhs (or ₹75 Lakhs if cash receipts do not exceed 5%). 
• Audit Trigger: An audit becomes compulsory if a professional declares profits below 50% of gross receipts and their total income exceeds the basic exemption limit. 

Other Special Schemes 

Sections 44AE, 44BB, or 44BBB 

• A tax audit is mandatory if the taxpayer declares income lower than the presumptive limits prescribed under these sections. 

Turnover Limits Summary (FY 2025-26 / AY 2026-27) 

Note: Please refer to the latest CBDT notification for AY 2026-27 to confirm the applicable threshold, as some sources indicate a ₹15 crore limit for businesses with 95%+ digital transactions.

Also Read - Income Tax Audit Limit for AY 2026-27

Statutory Filing Deadlines

Assessees who are mandated to have a tax audit must adhere to the following filing timelines: 

Explore More in Details - Income Tax Audit Last Date For The AY 2026-27

Forms Required for Audit Submission 

The auditor prepares and submits two primary forms on the e-filing portal: 

• Form 3CA: Applicable when the entity is already required to have its accounts audited under any other law (e.g., the Companies Act, 2013). 
• Form 3CB: Applicable when the entity is not required to undergo an audit under any other law (e.g., sole proprietorships or partnerships). 
• Form 3CD: A statement of particulars containing detailed tax-related operational disclosures, which is attached alongside Form 3CA or Form 3CB. 

Penalty for Non-Compliance (Section 271B) 

Failure to get accounts audited or to furnish the audit report before the prescribed due date invites a penalty under Section 271B. The penalty is the lower of the following: 

• 0.5% of total turnover, sales, or gross receipts; or 
• ₹1,50,000. 

Note: No penalty shall be levied if the assessee demonstrates a reasonable cause for the delay (such as natural disasters, death of key personnel, or system failures) to the satisfaction of the Assessing Officer.