1. If service provider is not registered, it could be presumed that he has claimed abatement (as he cannot avail the credit)- Pay service tax on 40% under RCM. (14.5%*40%)
2. If SP is registered with department and still not charging ST (may be less than 10 lacs), it could be considered that he has availed abatement and liability same as above under point 1.
3. If SP is registered with department and not charging service tax beyond 10 lacs, it is because he has claimed abatement and service tax under RCM as per option under 1.
In all above scenarios, suggested to take undertaking from SP that he has claimmed abatement and not taking credit on input, input service and capital goods.
4. Where SP has not claimed abatement, he would charge service tax on 50% value (i.e. 14.5%*50%). Balance tax needs to be paid under RCM (14.5%*50%)
@ Arpit- credit of service tax paid under rent a cab service not eligible as specifically excluded from the defintion of input service.