GSTR-3B (monthly) — due dates 2026
Summary return + tax payment for the previous month.
Who must file
Regular taxpayers not under QRMP
Penalty if missed
Late fee ₹50/day (₹20/day nil) + 18% p.a. interest on unpaid tax.
Upcoming due dates
| Due date | Filing | Type |
|---|---|---|
| 20 Aug 2026in 9 days | GSTR-3B (monthly)July 2026 | GST |
| 20 Sep 2026in 40 days | GSTR-3B (monthly)August 2026 | GST |
| 20 Oct 2026in 70 days | GSTR-3B (monthly)September 2026 | GST |
| 20 Nov 2026in 101 days | GSTR-3B (monthly)October 2026 | GST |
| 20 Dec 2026in 131 days | GSTR-3B (monthly)November 2026 | GST |
| 20 Jan 2027in 162 days | GSTR-3B (monthly)December 2026 | GST |
| 20 Feb 2027in 193 days | GSTR-3B (monthly)January 2027 | GST |
| 20 Mar 2027in 221 days | GSTR-3B (monthly)February 2027 | GST |
| 20 Apr 2027in 252 days | GSTR-3B (monthly)March 2027 | GST |
| 20 May 2027in 282 days | GSTR-3B (monthly)April 2027 | GST |
| 20 Jun 2027in 313 days | GSTR-3B (monthly)May 2027 | GST |
| 20 Jul 2027in 343 days | GSTR-3B (monthly)June 2027 | GST |
| 20 Aug 2027in 374 days | GSTR-3B (monthly)July 2027 | GST |