Important Points About Inputs for Service Providers

Inputs means any goods used for providing output service

Input can be claimed immediately on receipt of goods in factory
Payment to party is not relevant
Maximum period to take input is 1 year from date of Invoice

In case of Removal of Inputs as such (Purchase Return/Sale of Inputs),Cenvat taken has to be reversed

Petrol/Diesel
Motor vehicles
Goods for personal use of employees
  (like food items, goods used in guesthouse, club, recreation facility)
Construction Services of Building etc