Finance Act (Service Tax) 1994

Section 93:-  Power to grant exemption from service tax:

(1) If the Central Government is satisfied that it is necessary in the public interest so to do, it may, by notification in the Official Gazette, exempt generally or subject to such conditions as may be specified in the notification, taxable service of any specified description from the whole or any part of the service tax livable thereon.

(2) If the Central Government is satisfied that it is necessary in the public interest so to do, it may, by special order in each case, exempt any taxable service of any specified description from the payment of whole or any part of the service tax leviable thereon, under circumstances of exceptional nature to be stated in such order. 

Refer Notification No.16/2014 - Service Tax Dated 06/08/2014