20 Sep 25 To add/amend particulars (other than GSTIN) in GSTR-1 of Aug. It can be filed after filing of GSTR-1 but before filing corresponding GSTR-3B.

20 Sep 25 Summary Return cum Payment of Tax for August by Monthly filers. (other than QRMP).

20 Sep 25 Monthly Return by persons outside India providing online information and data base access or retrieval services, for August.

25 Sep 25 Deposit of GST under QRMP scheme for August .

27 Sep 25 Filing of Financial Statements for FY 2024-25 by OPC Companies.

27 Sep 25 Submission of Cost Audit Report by Cost Auditor to the Board of Directors for FY 2024-25.

28 Sep 25 Return for August by persons with Unique Identification Number (UIN) like embassies etc to get refund under GST for goods and services purchased by them.

30 Sep 25 Transfer of unspent CSR amount to the CSR fund by All Companies whose CSR Expenditure is unspent as on 31st March and such amount is not marked for any ongoing project.

30 Sep 25 Quarter 2 – Board Meeting of All Companies

30 Sep 25 Annual General Meeting of All Companies.

30 Sep 25 KYC of All Directors (individuals) who hold DIN on 31st March, 2025.

30 Sep 25 Annual accounts along with the list of all principal places of business in India established by a foreign company (Branch / Liaison /Project Office)

30 Sep 25 Certification of a Company's Annual Return by a Practising Company Secretary in case of listed Company, Company having paid-up share capital of 10 crore rupees or more or turnover of 50 crore rupees or more.

30 Sep 25 Secretarial Audit Report applicable in case of : (i) Listed Companies (ii) public company having a paid-up share capital of 50 crore rupees or more; or (iii) public company having a turnover of 250 crore rupees or more; or company having outstanding loans

30 Sep 25 Deposit of TDS u/s 194-IA on payment made for purchase of property in August.

30 Sep 25 Deposit of TDS u/s 194-IB @ 5% on total payment of Rent more than 50,000 pm by individual or HUF (not liable to tax audit) during FY 24-25, where lease has terminated in Aug. (Else TDS is to be deposited on annual basis by 30 April of next year.)

30 Sep 25 Deposit of TDS on certain payments made by individual/HUF u/s 194M for August.

30 Sep 25 Deposit of TDS on Virtual Digital Assets u/s 194S for August.

30 Sep 25 Filing of Tax Audit Report where due date of ITR is 31 Oct.

30 Sep 25 Filing of MAT/AMT Audit Report etc. where due date of ITR is 31 Oct.

30 Sep 25 Filing of Audit Report u/s 80JJAA(2) for additional employment where due date of ITR is 31 Oct.

30 Sep 25 Application for exercising option under Explanation to section 11(1) to apply income of previous year in the next year or in future, if ITR due date is Nov 30.?

30 Sep 25 Filing of Statement to accumulate income for future application u/s 10(21) or 11(1), if ITR due date is Nov 30.?

30 Sep 25 Filing of Audit report by a fund or trust or institution or any university or other educational institution or any hospital or other medical institution?

30 Sep 25 Payment of membership fee for 2024-25 by ICAI Members.

30 Sep 25 Filing of other Audit Reports , where due date of ITR is 31 Oct.