| Event Date | Act | Applicable Form | Obligation |
| 07/01/2019 | Income Tax | Challan No.ITNS-281 | Payment of TDS/TCS deducted/collected in DEC |
| 07/01/2019 | Income Tax | Form No.27C (TCS) | Submission of Forms received in DEC to IT Commissioner |
| 11/01/2019 | Goods and Service Tax | Form GSTR-1 | Return of Outward Supplies for Dec by Regular & Casual Suppliers. (Turnover exceed 1.50cr.) |
| 13/01/2019 | Goods and Service Tax | GSTR-6(ISD) | ISD return for the month of Dec |
| 14/01/2019 | Income Tax | Form 16B | Issue of TDS certificate in case of payment /credit made in Nov for purchase of property u/s 194IA. |
| 14/01/2019 | Income Tax | Form 16C | Issue of TDS Certificate for tax deducted under Sec.194IB for the month of Nov |
| 15/01/2019 | Income Tax | Form 27EQ | TCS Returns for Dec Quarter by ALL Collectors |
| 18/01/2019 | Goods and Services Tax | GSTR-4 | Return for Compostion Dealer for Dec quarter |
| 20/01/2019 | Goods and Services Tax | GSTR - 3 B | GSTR Return Summary for December |
| 20/01/2019 | Goods and Services Tax | Form GSTR-5 & 5A | Return of Inward & Outward Supplies for Dec by Non-Resident foreign taxable person. |
| 30/01/2019 | Income Tax | Form 26QC | Challan-cum-statement in respect of tax deducted under Sec.194IB for the month of Dec |
| 30/01/2019 | Income Tax | Form 26QB | Challan-cum-statement in respect of tax deducted under Sec.194IA for the month of Dec |
| 30/01/2019 | Income Tax | Form 26QB | Payment of TDS for Purchase of Property for Dec |
| 30/01/2019 | Income Tax | Form 27D | Issue TCS Certificates by Collectors for quarter ended Dec. |
| 31/01/2019 | Goods and Service Tax | GSTR-8 | GST TCS return for the month of Oct, Nov, & Dec |
| 31/01/2019 | Income Tax | Return No.24Q, 26Q & 27Q | TDS returns for Dec Quarter by ALL deductors |
| 31/01/2019 | Goods and Services Tax | GSTR-1 | Registered persons with aggregate turnover up to Rs. 1.50 Crores for Dec quarter |
| 31/01/2019 | Goods and Services Tax | GSTR-7 | GST TDS return for the month of Oct, Nov & Dec |