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 Jun 2026in 8 days | GSTR-3B (monthly)May 2026 | GST |
| 20 Jul 2026in 38 days | GSTR-3B (monthly)June 2026 | GST |
| 20 Aug 2026in 69 days | GSTR-3B (monthly)July 2026 | GST |
| 20 Sep 2026in 100 days | GSTR-3B (monthly)August 2026 | GST |
| 20 Oct 2026in 130 days | GSTR-3B (monthly)September 2026 | GST |
| 20 Nov 2026in 161 days | GSTR-3B (monthly)October 2026 | GST |
| 20 Dec 2026in 191 days | GSTR-3B (monthly)November 2026 | GST |
| 20 Jan 2027in 222 days | GSTR-3B (monthly)December 2026 | GST |
| 20 Feb 2027in 253 days | GSTR-3B (monthly)January 2027 | GST |
| 20 Mar 2027in 281 days | GSTR-3B (monthly)February 2027 | GST |
| 20 Apr 2027in 312 days | GSTR-3B (monthly)March 2027 | GST |
| 20 May 2027in 342 days | GSTR-3B (monthly)April 2027 | GST |
| 20 Jun 2027in 373 days | GSTR-3B (monthly)May 2027 | GST |