The Income Tax Audit deadline for AY 2026-2027 is September 30, 2026. Income Tax audit is mandatory for certain taxpayers because it helps to provide complete and accurate information about income, tax deduction and tax payments of the specified entity. The law says that chartered accountants have to conduct this tax audit and the entity which is required to conduct this tax audit needs to prepare and maintain books of accounts. Do you need to conduct an income tax audit even if opting for a presumptive taxation scheme? Chartered Accountant Abhishek Soni says that an income tax audit under Section 44AB may still be required, even if you opt for presumptive taxation under Section 44AD or 44ADA.