| September | Sl. No | Particulars | Revised Due Date |
| Direct Tax | 1 | Deposit of TDS & TCS for August, 2020 | 07 September 2020 |
| 2 | Due date for issue of TDS Certificate for tax deducted under Section 194-IA & 194-IB in the month of July, 2020. | 14 September 2020 | |
| 3 | Second instalment of advance tax for the assessment year 2021-22 | 15 September 2020 | |
| 4 | Furnishing of challan-cum-statement in respect of tax deducted u/s 194-IA & 194-IB in month of August 2020 | 30 September 2020 | |
| 5 | Return of income for the AY2019-20 for all assessee | 30 September 2020 | |
| Indirect Tax | 6 | GSTR 1 for the month of August 2020(Turnover exceeding  Rs. 1.50 Cr or opted to file monthly Return) | 11 September 2020 |
| 7 | GSTR 3B for the month May 2020 | Â Â Â 12 September 2020 | |
| 8 | GSTR 3B for the month June 2020 | 23 September 2020 | |
| 9 | GSTR 3B for the month July2020 | 27 September 2020 | |
| 10 | GSTR 9 (Annual return) for the FY 2018-19 | 30 September 2020 | |
| 11 | GSTR 9C (Reconciliation statement) for the FY 2018-19 | 30 September 2020 | |
| 12 | GSTR 9A (Annual return by composition dealers) for the FY2018-19 | 30 September 2020 | |
| Others | 13 | ESI & EPF contribution for the month of August 2020 | 15 September 2020 |
| 14 | DIR -3 KYC submission for DIN holders | 30 September 2020 | |
| 15 | Late fee waiver of all MCA filings | 30 September 2020 |
Taxpayers who are yet to file Form any month(s) from July, 2017 till Jan., 2020, can now file Form GSTR-3B from 1st July, 2020 till 30th Sept., 2020, without any late fee, for those months in which they did not have any tax liability. However, for the months they had a tax liability, their late fee would be capped at Rs 500 per return.