| Event Date | Act | Applicable Form | Obligation |
| 07/03/2021 | Income Tax | Challan No. ITNS-281 | Payment of TDS/TCS deducted/collected in February. |
| 10/03/2021 | Goods and Services Tax | GSTR-7 | Monthly Return by Tax Deductors for February. |
| 10/03/2021 | Goods and Services Tax | GSTR-8 | Monthly Return by e-commerce operators for February. |
| 11/03/2021 | Goods and Service Tax | GSTR-1 | Monthly return of Outward Supplies for February. |
| 13/03/2021 | Goods and Services Tax | GSTR-6 | Monthly Return of Input Service Distributor for February |
| 13/03/2021 | Goods and Services Tax | IFF | Optional Upload of B2B invoices, Dr/Cr notes for February under QRMP scheme. |
| 15/03/2021 | Providend Fund | Electronic Challan cum Return (ECR) | E-Payment of PF for February |
| 15/03/2021 | ESI | ESI Challan | Payment of ESI for February (Register new employees in 10 days of joining) |
| 15/03/2021 | Income Tax | Challan No.280 | Payment of balance Advance Income Tax by ALL. |
| 20/03/2021 | Goods and Services Tax | GSTR-5 & 5A | Monthly Return by Non-resident taxable person for february |
| 20/03/2021 | Goods and Services Tax | GSTR-3B | Summary Return cum Payment of Tax for Feb by monthly filers. |
| 25/03/2021 | Goods and Services Tax | PMT-06 | Deposit of GST of February under QRMP scheme. |
| 30/03/2021 | Income Tax | Form 26QB | Deposit of TDS on payment made for purchase of property in February |
| 30/03/2021 | Income Tax | Form 26QD | Deposit of TDS u/s 194M for February |
| 31/03/2021 | Goods and Service Tax | GST RFD-11 | Online Application for Letter of Undertaking (LUT) for Exports & Supplies to SEZ without payment of tax in 2021-22. |
| 31/03/2021 | Goods and Services Tax | GST CMP-02 | Opt for Composition schme for FY 2021-22. Existing ones are not required to apply again. |
| 31/03/2021 | Income Tax | ITR | Filing belated or revised ITR for AY 2020-21. |
| 31/03/2021 | Income Tax | ITR | Payment of life insurance premium, deposit of PPF etc. for saving tax of FY 20-21. |
| 31/03/2021 | MSME ACT | - | Migration of All existing Entrepreneurs Memorandum (EM) Part II and Udyog Aadhaar Memorandum (UAMs) obtained till 30.06.2020 to New Udyam Registration. ( https://udyamregistration.gov.in ) |
| 31/03/2021 | MSME ACT | - | GST registration is mandatory for Udyam Registration w.e.f. 1.4.21. In case you have obtained Udyam Registration on Self Declaration Basis & apply for GST registration and update in Udyam Registration to avoid de-activation (https://udyamregistration.gov.in ) |
| 31/03/2021 | Income Tax | Online form | Uploading declarations received in Form. 15G/15H during quarter ending June. |
| 31/03/2021 | Income Tax | - | Linking of PAN with Aadhaar. |
| 31/03/2021 | Income Tax | - | Payment of disputed amount of tax without additional payment under Vivad se Vishwas Scheme . |
| 31/03/2021 | Income Tax | Online form | Uploading declarations received in Form. 15G/15H during quarter ending March. |
| 31/03/2021 | Income Tax | Online form | Uploading declarations received in Form. 15G/15H during quarter ending September. |
| 31/03/2021 | Income Tax | Form 24Q, 26Q, 27Q | TDS Statements for Q1 of 20-21. |
| 31/03/2021 | Income Tax | Form 24Q, 26Q, 27Q | TDS Statements for Q2 of 20-21. |
| 31/03/2021 | Income Tax | Form 27EQ | TCS Statements for Q1 of 20-21. |
| 31/03/2021 | Income Tax | Form 27EQ | TCS Statements for Q2 of 20-21. |
| 31/03/2021 | Income Tax | Form 16A | Issue of non-salary TDS Certificates for Q1 of 20-21. |
| 31/03/2021 | Income Tax | Form 16A | Issue of non-salary TDS Certificates for Q2 of 20-21. |
| 31/03/2021 | Income Tax | Form 27D | Issue of TCS Certificate for Jun quarter. |
| 31/03/2021 | Income Tax | Form 27D | Issue of TCS Certificate for Sep quarter. |
| 31/03/2021 | Income Tax | Form 16B | Issue of TDS Certificate for tax deducted u/s. 194IA on purchase of property for payment made in April to October. |
| 31/03/2021 | Income Tax | Form 26QAA | Quarterly return of non-deduction of tax at source by a banks from interest on fixed deposits for quarter ending March. |
| 31/03/2021 | Income Tax | Form 26QAA | Quarterly return of non-deduction of tax at source by a banks from interest on fixed deposits for quarter ending June. |
| 31/03/2021 | Income Tax | Form 26QAA | Quarterly return of non-deduction of tax at source by a banks from interest on fixed deposits for quarter ending September. |
| 31/03/2021 | Income Tax | Form 61A | Furnishing of Statement of Financial Transactiosn as required to be furnished u/s 285BA(1) for 2019-20. (For tax audit assesses also receiving cash of more than 2 lacs against sales). |
| 31/03/2021 | Goods and Services Tax | GSTR-9C | GST Audit Report for 19-20. Mandatory if Turnover > 5 cr. |
| 31/03/2021 | Goods and Services Tax | GSTR-9 | GST Annual Return for 19-20. Mandatory if Turnover > 2cr. |
| 31/03/2021 | Income Tax | Form 26QB | Deposit of TDS on payment made for purchase of property from April to November, with interest. (if not deposited already) |
| 31/03/2021 | Income Tax | Form 26QD | Deposit of TDS u/s 194M from April to November, with interest. (If not deposited already) |