Due dates for filing of Form GSTR-3B for the Tax Periods from October, 2020 till March, 2021 17/12/2020 Government of India, Ministry of Finance (Department of Revenue), CBIC, vide Notification No. 82/2020 – Central Tax, dated 11th Nov., 2020, has added sub rule (6) to Rule 61 of the Central Goods and Services Tax Rules, 2017, to provide for staggered filing of Form GSTR-3B, for the tax periods from October, 2020 till March, 2021.