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Event DateActApplicable FormObligation
01/04/2021 Goods and Service Tax - Invoice to have HSN code of 6 digits for turnover above 5 cr in 20-21 & 4 digits for others.
01/04/2021 Goods and Service Tax - E-invoice mandatory if turnover was above 50 cr in any year from 2017-18 onwards.
01/04/2021 Goods and Service Tax - Dynamic QR Code must on B2B Invoices for turnover above 500 cr. Penalty to be levied from 1.12.20 if not ready by 1.4.21.
07/04/2021 Income Tax Challan No. ITNS-281 Payment of TCS collected in March.
10/04/2021 Goods and Service Tax GSTR-7 Monthly Return by Tax Deductors for March.
10/04/2021 Goods and Service Tax GSTR-8 Monthly Return by e-commerce operators for March.
11/04/2021 Goods and Service Tax GSTR-1 Monthly return of Outward Supplies for March.
13/04/2021 Goods and Service Tax GSTR-6 Monthly Return of Input Service Distributor for March.
13/04/2021 Goods and Services Tax GSTR-1 Quarterly return for Jan-Mar for quarterly filers.
15/04/2021 Income Tax Form 15CC Upload of statement of Foreign Remittances in March quarter by authorised dealers.
15/04/2021 Income Tax Online form Uploading declarations received in Form. 15G/15H during quarter ending March.
18/04/2021 Goods and Services Tax CMP-08 Payment of tax for Q4 of 20-21 for taxpayers under Composition Scheme.
20/04/2021 Goods and Service Tax GSTR-3B Summary Return cum Payment of Tax for Mar by Monthly filers.
20/04/2021 Goods and Service Tax GSTR-5 & 5A Monthly Return by Non-resident taxable person for March
22/04/2021 Goods and Service Tax GSTR-3B Summary Return of Jan-Mar quarter by Quarterly filers in Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Telangana, Andhra Pradesh, the Union territories of Daman and Diu and Dadra and Nagar Haveli, Puducherry, Andaman and Nicobar Islands or Lakshadweep.
24/04/2021 Goods and Service Tax GSTR-3B Summary Return of Jan-Mar quarter by Quarterly filers in Himachal Pradesh, Punjab, Uttarakhand, Haryana, Rajasthan, Uttar Pradesh, Bihar, Sikkim, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, Assam, West Bengal, Jharkhand or Odisha, the Union territories of Jammu and Kashmir, Ladakh,Chandigarh or Delhi.
25/04/2021 Goods and Service Tax ITC-04 Return for March quarter of Goods sent to or received from job-worker.
30/04/2021 Goods and Service Tax GSTR-4 Return of Outwards Supplies for 20-21 by Composition Supplier.
30/04/2021 Income Tax - Updation of UDIN for Audit Forms / Audit certificates at Income tax portal.
30/04/2021 Goods and Service Tax - Apply for QRMP Scheme for June quarter.
30/04/2021 Income Tax Challan No. ITNS-281 Payment of TDS Deducted in March (both Salary & non-salary)
30/04/2021 Income Tax Form 26QB Deposit of TDS on payment made for purchase of property in March.
30/04/2021 Income Tax Form 26QC Deposit of TDS @ 5% on total payment of Rent more than 50,000 pm by individual of HUF (not liable to tax audit) during last FY.
30/04/2021 Income Tax Form 61 Upload of particulars of declarations received in Form 60 from Oct - Mar.
30/04/2021 Income Tax Form 26QD Deposit of TDS  u/s 194M for March.
30/04/2021 MSMED, 2006 MSME Form I Specified Companies(receiving supplies from Micro & Small whose outstanding dues exceed 45 days) to file details of all outstanding dues to Micro or Small enterprises suppliers for Oct to March in PY
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Note: Please note that this is not an exhaustive list of obligations under various laws and rules. Important ones have been compiled to serve as a Ready Reckoner.
Please reconfirm in case of doubt or in case of extension/change & bring the same to our notice. We are not responsible for inadvertant errors, if any.