| Sun 18 Oct 2026 | CMP-08 CMP-08 quarterly tax statement (composition) | Q2 FY 2026-27 (Jul-Sep) |
| Tue 20 Oct 2026 | GSTR-3B GSTR-3B return and tax payment (monthly filers) | Sep 2026 |
| Tue 20 Oct 2026 | GSTR-5A GSTR-5A return (OIDAR / offshore online gaming) | Sep 2026 |
| Tue 20 Oct 2026 | PT KA Karnataka PT - employer monthly payment (Form 5-A) | Sep 2026 |
| Wed 21 Oct 2026 | 3CA-3CD Tax audit report 3CA/3CB/3CD (1961 Act) | FY 2025-26 |
| Wed 21 Oct 2026 | 10B/10BB Trust audit report 10B/10BB (1961 Act) | FY 2025-26 |
| Wed 21 Oct 2026 | REG 31 Shareholding pattern (Reg 31) - quarterly | Q2 FY 2026-27 (Jul-Sep) |
| Wed 21 Oct 2026 | PT WB West Bengal PT - employer monthly payment | Sep 2026 |
| Thu 22 Oct 2026 | GSTR-3B Q GSTR-3B quarterly QRMP (22nd - western/southern group) | Q2 FY 2026-27 (Jul-Sep) |
| Sat 24 Oct 2026 | GSTR-3B Q GSTR-3B quarterly QRMP (24th - northern/eastern group) | Q2 FY 2026-27 (Jul-Sep) |
| Sun 25 Oct 2026 | ITC-04 ITC-04 job work statement (AATO above Rs 5 crore) | H1 FY 2026-27 (Apr-Sep) |
| Tue 27 Oct 2026 | CRA-4 CRA-4 cost audit report (XBRL) | FY 2025-26 |
| Fri 30 Oct 2026 | FORM 141 Form 141 challan-cum-statement (old 26QB/26QC/26QD/26QE) | Sep 2026 |
| Fri 30 Oct 2026 | AOC-4 AOC-4 / AOC-4 XBRL / AOC-4 CFS financial statements | FY 2025-26 |
| Fri 30 Oct 2026 | CSR-2 CSR-2 report on CSR (addendum to AOC-4) | FY 2025-26 |
| Fri 30 Oct 2026 | LLP-8 LLP Form 8 statement of account and solvency | FY 2025-26 |
| Fri 30 Oct 2026 | MGT-15 MGT-15 report on AGM (listed companies) | FY 2025-26 |
| Fri 30 Oct 2026 | IF-GOV Integrated Filing (Governance) - quarterly | Q2 FY 2026-27 (Jul-Sep) |
| Fri 30 Oct 2026 | REG 76 Reconciliation of share capital audit report | Q2 FY 2026-27 (Jul-Sep) |
| Sat 31 Oct 2026 | QRMP OPTION QRMP opt-in / opt-out cut-off for the quarter | Q2 FY 2026-27 (Jul-Sep) |
| Sat 31 Oct 2026 | FORM 98 Form 98 - Form 97 declarations statement (old 61) | H1 FY 2026-27 (Apr-Sep) |
| Sat 31 Oct 2026 | FORM 143 TCS statement: Form 143 (old 27EQ) | Q2 FY 2026-27 (Jul-Sep) |
| Sat 31 Oct 2026 | FORM 138-144 TDS statements: Forms 138/140/144 (old 24Q/26Q/27Q) | Q2 FY 2026-27 (Jul-Sep) |
| Sat 31 Oct 2026 | 3CEB Transfer pricing report Form 3CEB (1961 Act) | FY 2025-26 |
| Sat 31 Oct 2026 | EPFO EEC EPFO Employees' Enrolment Campaign 2026 closes | EEC 2026 window (29 Jun - 31 Oct 2026) |
| Sat 31 Oct 2026 | MSME-1 MSME-1 half-yearly return on delayed MSE payments | H1 FY 2026-27 (Apr-Sep) |
| Sat 31 Oct 2026 | EPR E-WASTE Q E-waste EPR quarterly return (CPCB portal) | Q2 FY 2026-27 (Jul-Sep) |
| Sat 31 Oct 2026 | PT AS Assam PT - employer monthly Form III return and payment | Sep 2026 |
| Sat 7 Nov 2026 | TDS/TCS PAY TDS/TCS deposit (Income-tax Act 2025) | Oct 2026 |
| Sat 7 Nov 2026 | WAGES Pay monthly wages by the 7th (Code on Wages) | Oct 2026 |
| Sat 7 Nov 2026 | ECB 2 Form ECB 2 return (7 calendar days) | Oct 2026 |
| Sun 8 Nov 2026 | OSH REG Update old labour registrations in OSH FORM-I | Transition to OSH (Central) Rules 2026 |
| Tue 10 Nov 2026 | GSTR-7 GSTR-7 GST TDS return (deductors) | Oct 2026 |
| Tue 10 Nov 2026 | GSTR-8 GSTR-8 TCS statement (e-commerce operators) | Oct 2026 |
| Tue 10 Nov 2026 | PT AP Andhra Pradesh PT - employer monthly return and payment | Oct 2026 |
| Tue 10 Nov 2026 | PT MP Madhya Pradesh PT - employer monthly payment | Oct 2026 |
| Tue 10 Nov 2026 | PT TS Telangana PT - employer monthly Form V return and payment | Oct 2026 |
| Tue 10 Nov 2026 | MOOWR Customs bonded warehouse / MOOWR monthly return | Oct 2026 |
| Tue 10 Nov 2026 | IGCR-3 IGCR-3 monthly statement (concessional duty imports) | Oct 2026 |
| Wed 11 Nov 2026 | GSTR-1 GSTR-1 outward supplies (monthly filers) | Oct 2026 |
| Fri 13 Nov 2026 | GSTR-5 GSTR-5 return (non-resident taxable persons) | Oct 2026 |
| Fri 13 Nov 2026 | GSTR-6 GSTR-6 return (Input Service Distributor) | Oct 2026 |
| Fri 13 Nov 2026 | IFF IFF - invoice furnishing facility (QRMP, optional) | Oct 2026 |
| Sat 14 Nov 2026 | FORM 132 Form 132 TDS certificate (old 16B/16C/16D/16E) | Sep 2026 |
| Sat 14 Nov 2026 | IF-FIN Integrated Filing (Financial) - results, RPT, deviation | Q2 FY 2026-27 (Jul-Sep) |
| Sat 14 Nov 2026 | REG 52 Debt-listed entity financial results (Reg 52) | Q2 FY 2026-27 (Jul-Sep) |
| Sun 15 Nov 2026 | FORM 131 TDS/TCS certificates: Forms 131, 133 (old 16A, 27D) | Q2 FY 2026-27 (Jul-Sep) |
| Sun 15 Nov 2026 | FORM 137 Form 137 book adjustment statement (old 24G) | Oct 2026 |
| Sun 15 Nov 2026 | PF ECR EPF ECR filing and contribution payment | Oct 2026 |
| Sun 15 Nov 2026 | ESIC ESIC monthly contribution payment | Oct 2026 |
| Sun 15 Nov 2026 | PT GJ Gujarat PT - employer monthly return and payment | Oct 2026 |
| Sun 15 Nov 2026 | PTRC MH Maharashtra PTRC - monthly payment and e-return | Oct 2026 |