| Event Date | Act | Applicable Form | Obligation |
| 07/05/2019 | Income Tax | Challan No. ITNS-281 | Payment of TDS Deducted in April |
| 11/05/2019 | Goods and Service Tax | GSTR-1 | Outward supplies of taxable goods and/or services for the Month of April 2019 turnover exceeding 1.5 Cr.) Monthly Return. |
| 13/05/2019 | Goods and Service Tax | GSTR-6 | Return by Input Service Distributor |
| 15/05/2019 | Income Tax | Return No. 27EQ | TCS Return of all collectors for March Quarter |
| 15/05/2019 | Income Tax | Form No.27C (TCS) | Exemption from TCS |
| 15/05/2019 | Income Tax | Form No. 16 B | Due date for issue of TDS Certificate for tax deducted under Section 194-IA in the month of March, 2019 |
| 20/05/2019 | Goods and Service Tax | - | Due date for builders to opt for old rates(ITC) or new rates(No ITC) for ongoing housing projects. |
| 20/05/2019 | Goods and Service Tax | GSTR-3B | GSTR return for the month of April 2019 |
| 30/05/2019 | Income Tax | Form 16A/27D | Issue of TCS certificate for March Qtr. By All Collectors |
| 30/05/2019 | Income Tax | Form 26QB | Deposit of TDS/TCS of previous month on purchase of property |
| 30/05/2019 | Income Tax | Form - 49C | Statement by Non-resident having Liaison Office in India (u/s 285) |
| 31/05/2019 | Income Tax | Form 61-A | AIR by Assessees liable to Tax Audit receiving cash above 2 lacs against sales, Banks, Credit card companies etc for FY 2018-19. |
| 31/05/2019 | Income Tax | Return No. 24Q, 26Q & 27Q | TDS returns for Mar Quarter by ALL deductors |
| 31/05/2019 | Goods and Services Tax | GSTR-1 | Monthly Return of Outward Suppliers for April |
| 31/05/2019 | Goods and Services Tax | GSTR-6 | Furnishing of Return by Input Service Distributor for the months from Jul 2018 to Apr 2019 |