GST registration holder are required to file:
- GSTR-1 (details of outward supplies) till 11th of each month,
- GSTR-3B (monthly return) till 20th of each month.
Dealers registered under the GST composition scheme are required to file GSTR-4 every quarter, on 18th of the month next to the quarter.
Finally, annual GST return must be filed by all GST registered entities on/before the 31st of December subject to change of dates as per notifications
Now days only GSTR-1 and GSTR- 3B needs to be filed till further notifications.