| Event Date | Act | Applicable Form | Obligation |
| 07/01/2020 | Income Tax | Challan No. ITNS-281 | Payment of TDS Deducted in Dec. |
| 07/01/2020 | Income Tax | Form No.27C (TCS) | Submission of Forms received in Dec to IT Commissioner |
| 10/01/2020 | Goods and Services Tax | GSTR-7 | Monthly Return by Tax Deductors for Dec. |
| 10/01/2020 | Goods and Services Tax | GSTR-8 | Monthly Return by e-commerce operators for Dec. |
| 11/01/2020 | Goods and Service Tax | GSTR-1 | Monthly Return of Outward supplies for Dec (Turnover exceeding 1.5 Cr.). |
| 13/01/2020 | Goods and Service Tax | GSTR-6 | Monthly Return of Input Service Distributors for Dec. |
| 15/01/2020 | Providend Fund | Electronic Challan cum Return (ECR) | E-Payment of PF for Dec. |
| 15/01/2020 | ESI | ESI Challan | Payment of ESI for Dec. (Register new employees in 10 days of joining) |
| 15/01/2020 | Income Tax | Form 16B | Issue of Certificate of TDS on Payment made for purchase of property in Nov. |
| 15/01/2020 | Service Tax | SVLDRS 1 | Last date to avail Sabka Vishwas (Legacy Dispute Resolution) Scheme, 2019 |
| 15/01/2020 | Income Tax | Return No. 27EQ | TCS Return of all collectors for Dec. Quarter |
| 20/01/2020 | Goods and Services Tax | Form GSTR-5 & 5A | Monthly Return of Inward & Outward Supplies for Dec by Non-Resident foreign taxable person. |
| 20/01/2020 | Goods and Service Tax | GSTR-3B | Summary Return cum Payment of tax for Dec. |
| 30/01/2020 | Goods and Service Tax | GSTR-1 | Quarterly Return of Outward supplies for Dec quarter (Turnover upto 1.5 Cr.). |
| 30/01/2020 | Income Tax | Form 26QB | Deposit of TDS on payment made for purchase of property in Dec. |
| 30/01/2020 | Income Tax | Form 27D | Issue of TCS certificates for Dec quarter. |
| 31/01/2020 | Income Tax | Return No. 24Q, 26Q & 27Q | TDS returns for Dec. Quarter by ALL deductors |
| 31/01/2020 | Goods and Service Tax | GSTR-9 | GST Annual Return for 17-18. Mandatory for Turnover above 2cr. Optional for others. (extended due date). |
| 31/01/2020 | Goods and Service Tax | GSTR – 9C | GST Audit Return for 17-18 for Turnover above 2cr. (extended due date). |