20 Mar 26 Monthly Return by persons outside India providing online information and data base access or retrieval services, for February.

20 Mar 26 Add/amend particulars (other than GSTIN) in GSTR-1 of February. It can be filed after filing of GSTR-1 but before filing corresponding GSTR-3B.

20 Mar 26 Summary Return cum Payment of Tax for February by Monthly filers. (other than QRMP).

25 Mar 26 Deposit of GST of February under QRMP scheme.

28 Mar 26 Return by persons with Unique Identification Number (UIN) like embassies etc to get refund under GST for goods and services purchased by them, for February .

30 Mar 26 Deposit of TDS on payment made for purchase of property in February.

30 Mar 26 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 25-26 where lease has terminated in February (Else TDS is to be deposited on annual basis by 30 April of next year.)

30 Mar 26 Deposit of TDS u/s 194M for February.

30 Mar 26 Deposit of TDS on Virtual Digital Assets u/s 194S for February.

31 Mar 26 Complete CPE Hours for Calendar year 2025. Update Unstructured CPE hours details like reading of ICAI journal at https://cpeapp.icai.org.

31 Mar 26 Opt for Composition scheme for FY 2026-27. Existing ones are not required to apply again.

31 Mar 26 Online Application for Letter of Undertaking (LUT) for Exports & Supplies to SEZ without payment of tax in FY 2026-27.

31 Mar 26 For FY 26-27, GTA can change from Forward Charge mechanism to RCM or vice-versa by e-filing necessary declaration.

31 Mar 26 Calculation of Aggregate Turnover of F.Y. 25-26 for various compliances related to F.Y. 26-27 like for QRMP scheme, Composition scheme, E-invoice applicability etc.

31 Mar 26 Payment of balance Advance Income Tax by ALL to save interest u/s 234B.

31 Mar 26 Payment of life insurance premium, deposit of PPF etc. for saving tax of FY 25-26 under old regime.

31 Mar 26 Uploading of Statement of foreign income offered to tax and tax deducted or paid on such income in previous year 2024-25, to claim foreign tax credit if ITR furnished within the time specified under section 139(1) or section 139(4).

31 Mar 26 Pay Outstanding dues of Micro & Small Enterprises of FY 25-26 to avoid disallowance u/s 43B. No Relief of payment till due date of ITR.

31 Mar 26 Updated ITR for AY 2023-24 with 50% of aggregate tax and interest payable.

31 Mar 26 Updated ITR for AY 2024-25 with 25% of aggregate tax and interest payable.

31 Mar 26 "File Correction statements of FY 2018-19: Quarter 4 only, FY 2019-20 to FY 2022-23: All quarters and FY 2023-24: Quarters 1 to 3."

31 Mar 26 Complete CPE Hours for Calendar year 2025. Update Unstructured CPE hours details like reading of ICAI journal at https://cpeapp.icai.org.

31 Mar 26 Quarter 4 – Board Meeting of All Companies