| Event Date | Act | Applicable Form | Obligation |
| 01/05/2013 | D-VAT | Form 16 and CST 1 | E- Return of VAT Form 16 & CST 1 for the month ended Mar |
| 05/05/2013 | Service Tax | Challan No.GAR-7 | Payment of Service Tax of Apr by Companies |
| 06/05/2013 | Service Tax | Challan No.GAR-7 | Payment of Service Tax for month ending April for corporate assesses making E-PAYMENT |
| 07/05/2013 | Income Tax | Form No.15G, 15H,27C | Submission of Forms received in Apr to IT Commissioner |
| 07/05/2013 | Income Tax | Challan No.ITNS-281/17 | Payment of TDS/TCS deducted/collected in Apr |
| 10/05/2013 | Excise | ER-2 | Return for EOUs for Apr |
| 10/05/2013 | Excise | ER-6 | Return by units paying duty > 1 crore (CENVAT + PLA) for Apr |
| 10/05/2013 | Excise | ER-1 | Return for Non SSI assessees for Apr |
| 15/05/2013 | D-VAT | DVAT-20 | Deposit of DVAT TDS for Apr |
| 15/05/2013 | Income Tax | Return 24Q, 26Q, 27Q & 27EQ | Filing of TDS/TCS returns for Mar Quarter by ALL Deductors including Govt. |
| 15/05/2013 | Providend Fund | Electronic Challan cum Return (ECR) | E-Payment of PF for Apr( Cheque to be cleared by 20th) |
| 21/05/2013 | ESI | ESI Challan | Payment of ESI of Apr |
| 21/05/2013 | M-VAT | MVAT Challan | Payment of VAT & WCT TDS under MVAT for Apr |
| 21/05/2013 | M-VAT | Form 231-235 & CST 1 | Submission of MVAT return for Apr. |
| 21/05/2013 | D-VAT | DVAT-20 & Central | Deposit of VAT & CST for Apr |
| 22/05/2013 | D-VAT | DVAT - 43 | Issue of DVAT certificate for deduction made in Apr |
| 27/05/2013 | D-VAT | Dvat - 51 | DVAT-51 Filing for ALL quarters of 2011-12 |
| 28/05/2013 | D-VAT | 16 & 1 & Ack | Physical Return of VAT & CST for Apr |
| 30/05/2013 | Income Tax | Form 16A/ 27D | Issue of TDS/TCS certificate for Mar quarter. |
| 31/05/2013 | Income Tax | Form 16 | Issue of TDS certificate to Employees |