| | Sept 2026 | |
| Sl No | Particulars | Date |
| 1 | TDS and TCS Payments for the month of August 2026 | 2026-09-07 |
| 2 | Filing of Form ECB-2 for the month of August 2026 | 2026-09-07 |
| 3 | GSTR-8 & GSTR-7 Filing for the Month of August 2026 (For E commerce Operators) | 2026-09-10 |
| 4 | Filing of GSTR-1 for the month of August 2026 (Monthly filers) | 2026-09-11 |
| 5 | Filing of IFF for the month of August 2026 (QRMP scheme) | 2026-09-13 |
| 6 | PF-Payment and Monthly Return for the month of August 2026 | 2026-09-15 |
| 7 | ESI-Payment and Monthly Return for the month of August 2026 | 2026-09-15 |
| 8 | Payment of Advance tax for Quarter 2 of FY 2026-27 | 2026-09-15 |
| 9 | Filing of GSTR-3B for the month of August 2026 (Monthly filers) | 2026-09-20 |
| 10 | Employee PT Monthly Payment and Return for the month of August 2026 | 2026-09-20 |
| 11 | Payment of GST in Form PMT-06 for August 2026 (QRMP scheme) | 2026-09-25 |
| 12 | AOC 4 Filing by One Person Companies for FY 2025-26 (OPC) | 2026-09-27 |
| 13 | Tax Audit Report in Form 3CB-3CD and 3CA-3CD for Non Corporate's and Corporate's for FY 2025-26 | 2026-09-30 |
| 14 | Annual General Meeting for Companies | 2026-09-30 |
| 15 | Filing of Form 141 - Challan-cum-statement of deduction of tax under section 393(1) [Table Sl. No. 2(i), 3(i), 6(ii) & 8(vi)] in the month of July, 2026 | 2026-09-30 |
| 16 | Furnishing of Audit report in Form no. 10B/10BB by a fund or trust | 2026-09-30 |
