Tds on manpower contract

Ours is a Outsourcing company wherein we supply manpower on contract basis to corporates where our employees are on our payroll in turn we receive the payment from the corporates. Our Invoice includes Salaries, PF, ESI, Service Charge, Service Tax.  Is TDS applicable on total Invoice or only on Service Charge?

Example

Total Salaries payable      300000.00
PF                                            36000.00
ESI                                           15000.00
Service Charge                     30000.00
                                               ---------------
Total                                       381000.00
Service Tax                              39243.00
                                               ----------------
                                                420423.00

Now  I want to know on which amount TDS will be deducted?  

DVK RAJU
9948022333