| | October 2026 | |
| Sl No | Particulars | Date |
| 1 | TDS and TCS Payments for the month of September 2026 | 2026-10-07 |
| 2 | Filing of Form ECB-2 for the month of September 2026 | 2026-10-07 |
| 3 | GSTR-8 & GSTR-7 Filing for the Month of September 2026 (For E commerce Operators) | 2026-10-10 |
| 4 | Filing of GSTR-1 for the month of September 2026 (Monthly filers) | 2026-10-11 |
| 5 | Filing of GSTR-1 for the month of September 2026 (QRMP scheme) | 2026-10-13 |
| 6 | PF-Payment and Monthly Return for the month of September 2026 | 2026-10-15 |
| 7 | ESI-Payment and Monthly Return for the month of September 2026 | 2026-10-15 |
| 8 | TCS Returns (Form 143) for Q2 | 2026-10-15 |
| 9 | Filing of CMP-08 for the month of September 2026 (Quaterly) | 2026-10-18 |
| 10 | Filing of GSTR-3B for the month of September 2026 (Monthly filers) | 2026-10-20 |
| 11 | Employee PT Monthly Payment and Return for the month of September 2026 | 2026-10-20 |
| 12 | Tax Audit Report in Form 3CB-3CD and 3CA-3CD for Non Corporate's and Corporate's for FY 2025-26 | 2026-10-21 |
| 13 | Payment of GST in Form PMT-06 for September 2026 (QRMP scheme) | 2026-10-22 |
| 14 | AOC 4 Filing by Companies for FY 2025-26 | 2026-10-30 |
| 15 | TDS(Form 140/138/144) Returns for Q2 | 2026-10-31 |
| 16 | ITR for Companies of AY 2026-27/FY 2025-26 | 2026-10-31 |
| 17 | MSME Return for half-yearly (Apr-Sep) | 2026-10-31 |
