| Event Date | Act | Applicable Form | Obligation |
| 05/05/2012 | Service Tax | Challan No.GAR-7 | Payment of Service Tax of Apr by Companies |
| 07/05/2012 | Income Tax | Form No.15G, 15H,27C | Submission of Forms received in Apr to IT Commissioner |
| 07/05/2012 | Income Tax | Challan No.ITNS-281/17 | Payment of TDS/TCS deducted/collected in Apr |
| 10/05/2012 | Excise | ER-2 | Return for EOUs for Apr |
| 10/05/2012 | Excise | ER-1 | Return for Non SSI assessees for Apr |
| 10/05/2012 | Excise | ER-6 | Return by units paying duty > 1 crore (CENVAT + PLA) for Apr |
| 12/05/2012 | ESI | Form 5 | Half yearly Return of ESI |
| 15/05/2012 | D-VAT | DVAT-20 | Deposit of DVAT TDS for Apr |
| 15/05/2012 | Income Tax | Return 24Q, 26Q, 27Q & 27EQ | Filing of TDS/TCS returns for Mar Quarter |
| 15/05/2012 | | Challan | Payment of PF for Apr ( Cheque to be cleared by 20th) |
| 15/05/2012 | D-VAT | Form16 & 1/Form 17 & Ack | Return of VAT & CST from Oct to Mar by Half Yearly/ Composition dealer |
| 15/05/2012 | | Form 5 & Form 10 | Return of employees joining & leaving in Apr. |
| 21/05/2012 | D-VAT | DVAT-20 & Central | Deposit of VAT & CST for Apr |
| 21/05/2012 | M-VAT | MVAT Challan | Payment of VAT & WCT TDS under MVAT for Apr |
| 21/05/2012 | M-VAT | Form 231-235 & CST 1 | Submission of MVAT return for Apr. (10 days extra for e-returns) |
| 21/05/2012 | WB VAT | WB VAT Challan | Deposit of VAT & CST for Apr |
| 21/05/2012 | ESI | ESI Challan | Payment of ESI of Apr |
| 22/05/2012 | D-VAT | DVAT -43 | Issue of DVAT certificate for deduction made in Apr |
| 25/05/2012 | D-VAT | Form 16 and CST 1 | E- Return of VAT for Apr |
| 25/05/2012 | | Form 12A | Return of PF for Apr. |
| 28/05/2012 | D-VAT | 16 & 1 & Ack | Physical Return of VAT & CST for Apr |
| 30/05/2012 | Income Tax | Form 16A/ 27D | Issue of TDS/TCS certificate for Mar quarter. |
| 31/05/2012 | Income Tax | Form 16 | Issue of TDS certificate to Employees |