Updated: 16 October 2026 | Assessment Year 2026–27 September is usually a busy month for business owners and accountants, but the extended tax audit deadline 2026 has carried the workload into October. If your business requires a tax audit, check the revised due date and complete any pending work in time. For taxpayers covered by CBDT Circular No. 07/2026, the extended audit report deadline is 21 October 2026, while the related income tax return deadline is 21 November 2026.