CBIC has notified the monthly/ quarterly GSTR-1 due dates for the period July 2018~March 2019, i.e. for the months of July, Aug., Sept., Oct., Nov., Dec. 2018, Jan., Feb. and March 2019 the due date for filing monthly GSTR-1 shall be 11th of the following month, whereas for the quarters July-Sept. 2018, Oct.-Dec. 2018 and Jan.-March 2019 the due date for filing quarterly GSTR-1 shall be 31 Oct. 2018, 31 Jan. 2019 and 30 April, 2019, respectively.
GSTR-1 Due Date Extended upto 31 Oct. 2018 (July 2017 to Sept. 2018)
Monthly GSTR-1 Due Dates (July 2018 to March 2019)
CBIC has revised/ notified the deadline for filing of monthly GST Returns, i.e. GSTR-1 due dates, by taxpayers having aggregate turnover above Rs. 1.5 crores in the preceding/ current financial year, from 10th of the following month to 11th of the following month in respect of the period July 2018 to March 2019, as under:
| Month | Monthly GSTR-1 Due Date |
| July, 2018 | 11 August, 2018* |
| August, 2018 | 11 September, 2018* |
| September, 2018 | 11 October, 2018 |
| October, 2018 | 11 November, 2018 |
| November, 2018 | 11 December, 2018 |
| December, 2018 | 11 January, 2019 |
| January, 2019 | 11 February, 2019 |
| February, 2019 | 11 March, 2019 |
| March, 2019 | 11 April, 2019 |
Monthly GSTR-1 Due Dates (July 2018 to March 2019): CBIC Notification 32/2018 Central Tax dt. 10 Aug. 2018
Quarterly GSTR-1 Due Dates (July 2018 to March 2019)
CBIC has notified the deadline for filing of quarterly GST Returns, i.e. GSTR-1 due dates, by taxpayers having aggregate turnover upto Rs. 1.5 crores in the preceding/ current financial year, in respect of the period July 2018 to March 2019, as under:
| Quarter | Quarterly GSTR-1 Due Date |
| July 2018 to Sept. 2018 | 31 Oct. 2018* |
| October 2018 to Dec. 2018 | 31 Jan. 2019 |
| January 2019 to March 2019 | 30 April, 2019 |
Quarterly GSTR-1 Due Dates (July 2018 to March 2019): CBIC Notification 33/2018 Central Tax dt. 10 Aug. 2018
In short, during July 2018 to March 2019, the quarterly/ monthly GSTR-1 is to be filed within a month/ 11 days after the end of the respective quarter/ month.
* Revised/ Extended Due Dates for Filing of GSTR-1 by Taxpayers at Kerala/ Mahe/ Kodagu
CBIC has revised/ extended the deadline for filing of Monthly GSTR-1 (July-Sept. 2018) and Quarterly GSTR-1 (July-Sept. 2018) for taxpayers in the flood affected regions, like the State of Kerala, Mahe (Puducherry) and Kodagu (Karnataka), as detailed here-under:
GSTR-1/ GSTR-3B Due Dates Extended for Kerala/ Mahe/ Kodagu (July-August-Sept. 2018)
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GSTR-1 Due Dates (Monthly/ Quarterly) upto June 2018, as Revised/ Extended by CBIC
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