Businesses:

• Turnover exceeding ₹1 crore: Tax audit is mandatory if the total sales, turnover, or gross receipts of the business exceed ₹1 crore in the relevant previous year.
• Increased limit of ₹10 crores: If cash transactions (both receipts and payments) are not more than 5% of total transactions, the threshold for tax audit increases to ₹10 crores.

Professionals:

• Gross receipts exceeding ₹50 lakhs: Professionals (like doctors, lawyers, architects) must get their books audited if their gross receipts exceed ₹50 lakhs in the relevant previous year.

Presumptive Taxation Scheme (Section 44AD, 44ADA, 44AE):

• Business under Section 44AD: If the taxpayer has opted for presumptive taxation and declares profits lower than 8% (or 6% for digital receipts) of turnover or gross receipts, and their income exceeds the basic exemption limit, a tax audit is required.
• Profession under Section 44ADA: Professionals declaring income less than 50% of gross receipts and with total income exceeding the basic exemption limit need a tax audit.
• Transporters under Section 44AE: If the taxpayer claims income less than the prescribed amount under this section, tax audit becomes mandatory.

Other Specific Situations:

• Non-residents with Indian operations: If the turnover from Indian operations exceeds the threshold, a tax audit is required.
• Opting out of Presumptive Taxation: Taxpayers who have previously opted for the presumptive scheme under Section 44AD but wish to opt out of it are required to undergo a tax audit for the current year.