Central Board of Excise & Customs had issued Notification No. 18/2018-Central Tax to specify due dates for filing details of outward supplies in Form GSTR-1 for certain months as specified in the following table for such class of registered persons having aggregate turnover of more than INR 1.5 crore in the preceding financial year or in the current financial year –
| Sl. No. | Months for which the details in FORM GSTR-1 are furnished | Due date |
| 1 | April,2018 | 31st May, 2018 |
| 2 | May,2018 | 10th June, 2018 |
| 3 | June,2018 | 10th July, 2018 |
