| Event Date | Act | Applicable Form | Obligation |
| 01/04/2018 | Goods and Services Tax | EWB-01 | E-way Bill Mandatory for Inter-state Supplies. |
| 07/04/2018 | Income Tax | Form No.27C (TCS) | Submission of Forms received in Apr to IT Commissioner |
| 10/04/2018 | Goods and Services Tax | GSTR -1 | Taxpayers with annual aggregate turnover more than Rs. 1.5 crore need to file GSTR 1 for Feb on monthly Basis |
| 14/04/2018 | Income Tax | Form No. 16 B | Due date for issue of TDS Certificate for tax deducted under Section 194-IA for the month of February |
| 15/04/2018 | Providend Fund | Electronic Challan cum Return (ECR) | E-Payment of PF for March |
| 15/04/2018 | Income Tax | Form No.15CC | Statement by Banks etc. in respect of foreign remittances during the quarter |
| 15/04/2018 | ESI | ESI Challan | Payment of ESI of Mar (Applicable for Salary upto Rs. 21,000 instead of 15,000 earlier) |
| 16/04/2018 | Goods and Services Tax | EWB-01 | E-way Bill Mandatory for Intra-state Supplies (Gujarat, Uttar Pradesh, Andhra Pradesh, Telangana and Kerala) |
| 18/04/2018 | Goods and Services Tax | GSTR-4 | Quarterly Return of Outward Suppliers by Composition Supplier for Jan-Mar |
| 20/04/2018 | Goods and Services Tax | GSTR-5 | Return of Outward Suppliers by Foreign Supplier for Mar |
| 20/04/2018 | Goods and Services Tax | GSTR-5 | GSTR-5 for (Non resident ) for the March |
| 20/04/2018 | Goods and Services Tax | GSTR-5A | GSTR-5A for (Non-resident Foreign Taxpayers) March |
| 20/04/2018 | Goods and Services Tax | GSTR -3B | GSTR Return Summary for March |
| 30/04/2018 | Goods and Services Tax | GSTR -1 | Taxpayers with annual aggregate turnover up to Rs. 1.5 crore need to file GSTR 1 for January - March on Quarterly Basis |
| 30/04/2018 | Income Tax | Challan No.ITNS-281 | Payment of TDS/TCS deducted/collected in March |
| 30/04/2018 | Income Tax | Form No.15G/H | E-filing of form 15G/H for Mar Quarter |
| 30/04/2018 | Income Tax | 26QB | Due date for furnishing of challan-cum-statement in respect of tax deducted under Section 194-IA for the month of March |
| 30/04/2018 | Company Law | AOC-4 XBRL | Last date of filing of AOC-4 XBRL E-Forms using Ind AS under the Companies Act, 2013 |
| 30/04/2018 | Company Law | e-CODS | Last date of submitting documents and filing E-form under Condonation of Delay Scheme, 2018 |
| 30/04/2018 | Income Tax | Form 61 | E-filing of information of declarations in Form 60 received upto 31st March |
| 30/04/2018 | Maharastra Profession Tax | MTR-6/Form IIIB | Payment & Monthly Return of Maharastra PT (Annual Liability 50000 or more) |
| 30/04/2018 | Income Tax | 26QC | Payment of TDS for full year, deducted by individual/HUF not liable to Tax audit from rent > 50,000 pm payable to resident. (Wef 01.06.17) |