| 07.09.2023 | FEMA | ECB-2 return for the month of Aug-23 (7 Working days from beginning of the month) |
| 07.09.2023 | IT | TDS/TCS payment for the month of Aug-23 |
| 10.09.2023 | GST | GSTR-7 (GST TDS) for the month of Aug-23 |
| 10.09.2023 | GST | GSTR-8 (GST TCS) for the month of Aug-23 |
| 11.09.2023 | GST | GSTR-1 for the month of Aug-23 (Other than QRMP). |
| 13.09.2023 | GST | GSTR-1 IFF (Invoice furnishing facility) for Aug-23 (QRMP scheme) |
| 13.09.2023 | GST | GSTR-6 (Return for Input Service Distributor) for the month of Aug-23 |
| 14.09.2023 | IT | Due date for issue of TDS Certificate for tax deducted under section 194-IA, IB & M, S in the month of July-23 |
| 15.09.2023 | IT | Second Instalment of Advance tax for the FY 2023-24 / AY 2024-25 |
| 15.09.2023 | PF | PF payment for the month of Aug-23 |
| 15.09.2023 | PF | PF – ECR Filing for the month of Aug-23 |
| 15.09.2023 | ESI | ESIC payment for the month of Aug-23 |
| 20.09.2023 | GST | GSTR-3B for the month of Aug-23 (Other than QRMP scheme). |
| 20.09.2023 | GST | GSTR-5 (Non-Resident Taxable Person) for the month of Aug-23 |
| 20.09.2023 | GST | GSTR-5A (OIDAR Services) for the month of Aug-23 |
| 25.09.2023 | GST | PMT-06 Challan for deposting tax (for taxpayers opting for quarterly GSTR 3B). |
| 27.09.2023 | ROC | Form AOC – 4 (Filing of Annual accounts) for One person Companies |
| 30.09.2023 | IT | Due date for furnishing challan-cum-statement in respect of tax deducted under section 194 IA, IB, M, S in the month of Aug 2023 |
| 30.09.2023 | IT | Country-By-Country Report in Form No. 3CEAD for the previous year 2022-23 by a parent entity or the alternate reporting entity, resident in India, in respect of the international group of which it is a constituent of such group |
| 30.09.2023 | IT | Form 9A for Trusts – Application to apply income of current year in the next year or future (if the assessee is required to submit return of income on November 30, 2023) |
| 30.09.2023 | IT | Form 10 for Trusts – Application to accumulate income for future application (if the assessee is required to submit return of income on November 30, 2023) |
| 30.09.2023 | IT | Due date for filing of audit report under section 44AB for the assessment year 2023-24 in the case of a corporate-assessee or non-corporate assessee (who is required to submit his/its return of income on October 31, 2023) |
| 30.09.2023 | RBI | Filing of revised form Foreign Liabilities and Assets Annual Return for the FY 22-23 |
| 30.09.2023 | ROC | Annual General Meeting for Companies |
| 30.09.2023 | ROC | DIR 3 KYC for directors of company’s and LLP’s |
| 30.09.2023 | PT/CT | Due date for depositing Profession tax and Company tax for the first half year of FY 2023-24 |
