| Month | Due Date | Return | Applicable To | Description | Frequency | Notes |
|---|---|---|---|---|---|---|
| March 2026 | 11-Mar-26 | GSTR-1 | Regular Taxpayers (Monthly) | Outward Supplies Return for February 2026 | Monthly | Turnover > ₹5 Cr or opted out of QRMP |
| March 2026 | 13-Mar-26 | GSTR-1A / IFF | QRMP Taxpayers | Invoice Furnishing Facility for Feb 2026 (Opt.) | Monthly | For QRMP scheme taxpayers |
| March 2026 | 13-Mar-26 | GSTR-6 | Input Service Distributors | ISD Return for February 2026 | Monthly | |
| March 2026 | 20-Mar-26 | GSTR-3B | Regular Taxpayers (Monthly) | Summary Return & Tax Payment for Feb 2026 | Monthly | Turnover > ₹5 Cr |
| March 2026 | 22-Mar-26 | GSTR-3B | QRMP - Category I States | Tax Payment for Feb 2026 (Cat I States) | Monthly | States: Chhattisgarh, MP, Gujarat, etc. |
| March 2026 | 24-Mar-26 | GSTR-3B | QRMP - Category II States | Tax Payment for Feb 2026 (Cat II States) | Monthly | States: Delhi, Haryana, UP, etc. |
| March 2026 | 28-Mar-26 | GSTR-11 | UIN Holders (Embassies/UN) | Inward Supplies Statement for Feb 2026 | Monthly | |
| March 2026 | 31-Mar-26 | GSTR-9 / 9C | All Regular Taxpayers | Annual Return & Audit for FY 2024-25 | Annual | Last date - critical deadline |
| April 2026 | 11-Apr-26 | GSTR-1 | Regular Taxpayers (Monthly) | Outward Supplies Return for March 2026 | Monthly | |
| April 2026 | 13-Apr-26 | IFF | QRMP Taxpayers | Invoice Furnishing Facility for Mar 2026 | Monthly | |
| April 2026 | 13-Apr-26 | GSTR-6 | Input Service Distributors | ISD Return for March 2026 | Monthly | |
| April 2026 | 20-Apr-26 | GSTR-3B | Regular Taxpayers (Monthly) | Summary Return & Tax Payment for Mar 2026 | Monthly | Turnover > ₹5 Cr |
| April 2026 | 22-Apr-26 | GSTR-3B | QRMP - Category I States | Tax Payment for Mar 2026 (Cat I States) | Monthly | |
| April 2026 | 24-Apr-26 | GSTR-3B | QRMP - Category II States | Tax Payment for Mar 2026 (Cat II States) | Monthly | |
| April 2026 | 25-Apr-26 | GSTR-3B / PMT-06 | QRMP Taxpayers (Q4 FY26) | Q4 FY 25-26 Return or Challan Payment | Quarterly | Jan-Mar 2026 Quarter |
| April 2026 | 30-Apr-26 | GSTR-4 | Composition Taxpayers | Annual Return for FY 2025-26 | Annual | Composition scheme taxpayers |
| May 2026 | 11-May-26 | GSTR-1 | Regular Taxpayers (Monthly) | Outward Supplies Return for April 2026 | Monthly | |
| May 2026 | 13-May-26 | GSTR-6 | Input Service Distributors | ISD Return for April 2026 | Monthly | |
| May 2026 | 20-May-26 | GSTR-3B | Regular Taxpayers (Monthly) | Summary Return & Tax Payment for Apr 2026 | Monthly | |
| May 2026 | 22-May-26 | GSTR-3B | QRMP - Category I States | Tax Payment for Apr 2026 (Cat I States) | Monthly | |
| May 2026 | 24-May-26 | GSTR-3B | QRMP - Category II States | Tax Payment for Apr 2026 (Cat II States) | Monthly | |
| May 2026 | 31-May-26 | GSTR-7 / GSTR-8 | TDS / TCS Deductors | TDS & TCS Returns for April 2026 | Monthly | |
| June 2026 | 11-Jun-26 | GSTR-1 | Regular Taxpayers (Monthly) | Outward Supplies Return for May 2026 | Monthly | |
| June 2026 | 13-Jun-26 | GSTR-6 | Input Service Distributors | ISD Return for May 2026 | Monthly | |
| June 2026 | 20-Jun-26 | GSTR-3B | Regular Taxpayers (Monthly) | Summary Return & Tax Payment for May 2026 | Monthly | |
| June 2026 | 22-Jun-26 | GSTR-3B | QRMP - Category I States | Tax Payment for May 2026 (Cat I States) | Monthly | |
| June 2026 | 24-Jun-26 | GSTR-3B | QRMP - Category II States | Tax Payment for May 2026 (Cat II States) | Monthly | |
| July 2026 | 11-Jul-26 | GSTR-1 | Regular Taxpayers (Monthly) | Outward Supplies Return for June 2026 | Monthly | |
| July 2026 | 13-Jul-26 | GSTR-6 | Input Service Distributors | ISD Return for June 2026 | Monthly | |
| July 2026 | 20-Jul-26 | GSTR-3B | Regular Taxpayers (Monthly) | Summary Return & Tax Payment for Jun 2026 | Monthly | |
| July 2026 | 22-Jul-26 | GSTR-3B | QRMP - Category I States | Tax Payment for Jun 2026 (Cat I States) | Monthly | |
| July 2026 | 24-Jul-26 | GSTR-3B | QRMP - Category II States | Tax Payment for Jun 2026 (Cat II States) | Monthly | |
| July 2026 | 25-Jul-26 | GSTR-3B / PMT-06 | QRMP Taxpayers (Q1 FY27) | Q1 FY26-27 Return or Challan Payment | Quarterly | Apr-Jun 2026 Quarter |
| July 2026 | 31-Jul-26 | GSTR-9 / 9C | All Regular Taxpayers | Annual Return & Audit for FY 2025-26 | Annual | Tentative extended deadline |
| August 2026 | 11-Aug-26 | GSTR-1 | Regular Taxpayers (Monthly) | Outward Supplies Return for July 2026 | Monthly | |
| August 2026 | 13-Aug-26 | GSTR-6 | Input Service Distributors | ISD Return for July 2026 | Monthly | |
| August 2026 | 20-Aug-26 | GSTR-3B | Regular Taxpayers (Monthly) | Summary Return & Tax Payment for Jul 2026 | Monthly | |
| August 2026 | 22-Aug-26 | GSTR-3B | QRMP - Category I States | Tax Payment for Jul 2026 (Cat I States) | Monthly | |
| August 2026 | 24-Aug-26 | GSTR-3B | QRMP - Category II States | Tax Payment for Jul 2026 (Cat II States) | Monthly | |
| September 2026 | 11-Sep-26 | GSTR-1 | Regular Taxpayers (Monthly) | Outward Supplies Return for August 2026 | Monthly | |
| September 2026 | 13-Sep-26 | GSTR-6 | Input Service Distributors | ISD Return for August 2026 | Monthly | |
| September 2026 | 20-Sep-26 | GSTR-3B | Regular Taxpayers (Monthly) | Summary Return & Tax Payment for Aug 2026 | Monthly | |
| September 2026 | 22-Sep-26 | GSTR-3B | QRMP – Category I States | Tax Payment for Aug 2026 (Cat I States) | Monthly | |
| September 2026 | 24-Sep-26 | GSTR-3B | QRMP – Category II States | Tax Payment for Aug 2026 (Cat II States) | Monthly | |
| October 2026 | 11-Oct-26 | GSTR-1 | Regular Taxpayers (Monthly) | Outward Supplies Return for September 2026 | Monthly | |
| October 2026 | 13-Oct-26 | GSTR-6 | Input Service Distributors | ISD Return for September 2026 | Monthly | |
| October 2026 | 20-Oct-26 | GSTR-3B | Regular Taxpayers (Monthly) | Summary Return & Tax Payment for Sep 2026 | Monthly | |
| October 2026 | 22-Oct-26 | GSTR-3B | QRMP – Category I States | Tax Payment for Sep 2026 (Cat I States) | Monthly | |
| October 2026 | 24-Oct-26 | GSTR-3B | QRMP – Category II States | Tax Payment for Sep 2026 (Cat II States) | Monthly | |
| October 2026 | 25-Oct-26 | GSTR-3B / PMT-06 | QRMP Taxpayers (Q2 FY27) | Q2 FY26-27 Return or Challan Payment | Quarterly | Jul – Sep 2026 Quarter |
| November 2026 | 11-Nov-26 | GSTR-1 | Regular Taxpayers (Monthly) | Outward Supplies Return for October 2026 | Monthly | |
| November 2026 | 13-Nov-26 | GSTR-6 | Input Service Distributors | ISD Return for October 2026 | Monthly | |
| November 2026 | 20-Nov-26 | GSTR-3B | Regular Taxpayers (Monthly) | Summary Return & Tax Payment for Oct 2026 | Monthly | |
| November 2026 | 22-Nov-26 | GSTR-3B | QRMP – Category I States | Tax Payment for Oct 2026 (Cat I States) | Monthly | |
| November 2026 | 24-Nov-26 | GSTR-3B | QRMP – Category II States | Tax Payment for Oct 2026 (Cat II States) | Monthly | |
| December 2026 | 11-Dec-26 | GSTR-1 | Regular Taxpayers (Monthly) | Outward Supplies Return for November 2026 | Monthly | |
| December 2026 | 13-Dec-26 | GSTR-6 | Input Service Distributors | ISD Return for November 2026 | Monthly | |
| December 2026 | 20-Dec-26 | GSTR-3B | Regular Taxpayers (Monthly) | Summary Return & Tax Payment for Nov 2026 | Monthly | |
| December 2026 | 22-Dec-26 | GSTR-3B | QRMP – Category I States | Tax Payment for Nov 2026 (Cat I States) | Monthly | |
| December 2026 | 24-Dec-26 | GSTR-3B | QRMP – Category II States | Tax Payment for Nov 2026 (Cat II States) | Monthly | |
| January 2027 | 11-Jan-27 | GSTR-1 | Regular Taxpayers | Outward Supplies Return for December 2026 | Monthly | |
| January 2027 | 13-Jan-27 | GSTR-6 | Input Service Distributors | ISD Return for December 2026 | Monthly | |
| January 2027 | 20-Jan-27 | GSTR-3B | Regular Taxpayers | Summary Return & Tax Payment for Dec 2026 | Monthly | |
| January 2027 | 22-Jan-27 | GSTR-3B | QRMP – Category I States | Tax Payment for Dec 2026 (Cat I States) | Monthly | |
| January 2027 | 24-Jan-27 | GSTR-3B | QRMP – Category II States | Tax Payment for Dec 2026 (Cat II States) | Monthly | |
| January 2027 | 25-Jan-27 | GSTR-3B / PMT-06 | QRMP Taxpayers | Q3 FY26-27 Return or Challan Payment | Quarterly | Oct – Dec 2026 Quarter |
| February 2027 | 11-Feb-27 | GSTR-1 | Regular Taxpayers | Outward Supplies Return for January 2027 | Monthly | |
| February 2027 | 13-Feb-27 | GSTR-6 | Input Service Distributors | ISD Return for January 2027 | Monthly | |
| February 2027 | 20-Feb-27 | GSTR-3B | Regular Taxpayers | Summary Return & Tax Payment for Jan 2027 | Monthly | |
| February 2027 | 22-Feb-27 | GSTR-3B | QRMP – Category I States | Tax Payment for Jan 2027 | Monthly | |
| February 2027 | 24-Feb-27 | GSTR-3B | QRMP – Category II States | Tax Payment for Jan 2027 | Monthly | |
| March 2027 | 11-Mar-27 | GSTR-1 | Regular Taxpayers | Outward Supplies Return for February 2027 | Monthly | |
| March 2027 | 13-Mar-27 | GSTR-6 | Input Service Distributors | ISD Return for February 2027 | Monthly | |
| March 2027 | 20-Mar-27 | GSTR-3B | Regular Taxpayers | Summary Return & Tax Payment for Feb 2027 | Monthly | |
| March 2027 | 22-Mar-27 | GSTR-3B | QRMP – Category I States | Tax Payment for Feb 2027 | Monthly | |
| March 2027 | 24-Mar-27 | GSTR-3B | QRMP – Category II States | Tax Payment for Feb 2027 | Monthly | |
| March 2027 | 31-Mar-27 | GSTR-9 / 9C | All Regular Taxpayers | Annual Return & Audit for FY 2026 – 27 | Annual | Last date – Critical deadline |