RCM Applicability

First you need to specify which type of service?? There are a list of services for which reverse charge is applicable.

And Sale of goods to unregistered person for more than 5000 reverse charge is applicable.

@ Mopidevi. Sir, the 2nd scenario you explained is applicable only for notified taxable persons. For all other registered persons are exempted to pay reverse charge u/s 9(4). currently RCM is applicable only for those notified services stated u/s 9(3) of CGST act. Eg: GTA, legal services recieved by business entities etc.