| Event Date | Act | Applicable Form | Obligation |
| 07/12/2020 | Income Tax | Challan No. ITNS-281 | Payment of TDS/TCS deducted /collected in November. |
| 10/12/2020 | Goods and Services Tax | GSTR-7 | Monthly Return by Tax Deductors for November. |
| 10/12/2020 | Goods and Services Tax | GSTR-8 | Monthly Return by e-commerce operators for November. |
| 11/12/2020 | Goods and Service Tax | GSTR-1 | Monthly return of Outward Supplies for Nov (Turnover exceeding 1.5 Cr.in previous year). |
| 13/12/2020 | Goods and Services Tax | GSTR-6 | Monthly Return of Input Service Distributor for November. |
| 15/12/2020 | Providend Fund | Electronic Challan cum Return (ECR) | E-payment of PF for November 2020. |
| 15/12/2020 | ESI | ESI Challan | ESI payment for November 2020. |
| 15/12/2020 | Income Tax | Challan No.280 | Deposit of Third Instalment of Advance Tax (75%) by all assesses (other than 44AD & 44ADA cases). |
| 20/12/2020 | Goods and Services Tax | GSTR-5 & 5A | Monthly Return by Non-resident taxable person for November. |
| 20/12/2020 | Goods and Services Tax | GSTR-3B | Summary Return cum Payment of Tax for Nov by taxpayers having an aggregate turnover of more than Rs. 5 cr in previous financial year. |
| 22/12/2020 | Goods and Service Tax | GSTR-3B | Summary Return cum Payment of Tax for Nov by taxpayer with turnover upto 5 cr.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. |
| 24/12/2020 | Goods and Service Tax | GSTR-3B | Summary Return cum Payment of Tax for Nov by taxpayer with turnover upto 5 cr.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. |
| 30/12/2020 | Income Tax | Form 26QB | Deposit of TDS on payment made for purchase of property in November. |
| 30/12/2020 | Income Tax | Form 26QD | Deposit of TDS u/s 194M for November. |
| 31/12/2020 | Income Tax | Form-3CD | Filing of Tax Audit Report. |
| 31/12/2020 | Income Tax | Form- 1 to 7 | Filing ITR for AY 2020-2021 for non-audit cases. (extended due date) |
| 31/12/2020 | Goods and Service Tax | GSTR-9 | GST Annual Return for 18-19. Mandatory if Turnover > 2 cr. |
| 31/12/2020 | Goods and Service Tax | GSTR-9C | GST Audit Report for 18-19. Mandatory if Turnover > 5 cr. |
| 31/12/2020 | MCA | - | Holding of AGM for FY 19-20 (extended due date). |
| 31/12/2020 | MCA | - | Avail Companies Fresh Start Scheme, 2020. |
| 31/12/2020 | MCA | - | Avail LLP Settlement Scheme. |
| 31/12/2020 | Goods and Services Tax | GSTR-9 | GST Annual Return for 19-20. Mandatory if Turnover > 2 cr. |
| 31/12/2020 | Goods and Services Tax | GSTR-9C | GST Audit Report for 19-20. Mandatory if Turnover > 5 cr. |
| 31/12/2020 | Goods and Service Tax | GSTR-9A | GST Annual Return for 18-19 by Composition taxpayer. |
| 31/12/2020 | Income Tax | - | Making of Declaration under Vivad se Vishwas Scheme. Payment of disputed amount of Tax without additional payment can be made till 31.03.2021. |