Due dates for the Income Tax
| Due date | Form to be filed | Period | By Whom and When to be filed |
| 07.09.2021 | Challan No. ITNS-281 | August 2021 | Payment of TDS/TCS deducted /collected in August 2021. |
| 14.09.2021 | TDS Certificate | July 2021 | Due date for issue of TDS Certificate for tax deducted in the month of July, 2021 |
| 15.09.2021 | Form 24G by Government officer | August 2021 | Due date for furnishing of Form 24G by an office of the Government where TDS/TCS for the month of August, 2021 has been paid without the production of a challan |
| 15.09.2021 | Advance Tax Payment | July to September 2021 | Second installment of advance tax for July to September for the assessment year 2022-23 |
| 15.09.2021 | Form No. 3BB | August 2021 | Due date for furnishing statement in Form no. 3BB by a stock exchange in respect of transactions in which client codes been modified after registering in the system for the month of August, 2021 |
Due dates for the GST Returns
| Due date | Form to be filed | Period | By Whom and When to be filed |
| 10.09.2021 | GSTR 7 | August 2021 | GSTR 7 is a return to be filed by the persons who is required to deduct TDS (Tax deducted at source) under GST |
| 10.09.2021 | GSTR 8 | August 2021 | GSTR-8 is a return to be filed by the e-commerce operators who are required to deduct TCS (Tax collected at source) under GST |
| 11.09.2021 | GSTR 1 | August 2021 | Taxpayers having an aggregate turnover of more than Rs. 1.50 Crores or opted to file Monthly Return |
| 13.09.2021 | GSTR 1 IFF (QRMP) | August 2021 | GST return for the taxpayers who opted for QRMP scheme. This is optional. |
| 13.09.2021 | GSTR 6 | August 2021 | Input Service Distributors |
| 20.09.2021 | GSTR 5 & 5A | August 2021 | Non-Resident Taxpayers and ODIAR services provider |
| 20.09.2021 | GSTR 3B | August 2021 | The due date for GSTR-3B having an Annual Turnover of more than 5 Crores |
| 25.09.2021 | GST Challan Payment | August 2021 | GST Challan Payment by quarterly filer if no sufficient ITC for August. |
Due dates for the PF / ESI
| Due date | Form to be filed | Period | By Whom and When to be filed |
| 15.09.2021 | Electronic Challan cum Return (ECR) (PF) | August 2021 | E-payment of Provident Fund |
| 15.09.2021 | ESI Challan | August 2021 | ESI payment |
| 30.09.2021 | TDS Challan-cum-statement | August 2021 | Due date for furnishing of challan-cum-statement in respect of tax deducted under section 194-IA, 194 IB, 194M |
| 30.09.2021 | Income Tax Return | AY 2021-22 | ITR filing for non audit cases and who have not entered into any international or specified domestic transactionsEarlier Due date was 31st July, 2021 which is extended to 30th September, 2021 |
| 30.09.202 1(As extended from 30.06.2021) | Linking of Aadhaar | – | Due date for linking of Aadhaar number with PAN 2021) |
Due dates for the MCA
| Due date | Form to be filed | Period | By Whom and When to be filed |
| 27.09.2021 (As extended) | Form AOC 4 | FY 2020-21 | AOC 4 filing by OPC (If we count 180 days from 1st April 2021) |
| 30.09.2021 (As extended) | DIR 3 KYC | FY 2020-21 | DIR 3 KYC for Directors |