Dear Shashi,
This is my opinion for the query,
RCM is dealt with Section 9(3) and 9(4) of the CGST Act and Section 5(3) and 5(4) of the IGST Act.
Notification 13/2017 brought GTA services into the ambit of RCM.
Notification 11/2017 later amended by Notification 20/2017 , provided the rate of GST under RCM.
On a fair reading of the law, we understand as below:
As per Section 2(98) of the CGST Act 2017.
“reverse charge” means the liability to pay tax by the recipient of supply of goods or services or both instead of the supplier of such goods or services or both under sub-section (3) or sub-section (4) of section 9, or under sub-section (3) or sub-section (4) of section 5 of the Integrated Goods and Services Tax Act.
Based on the above we understand that RCM brings all responsibility of GST onto Service Recipient as though he is the provider of service.
Hence, if GST is paid under RCM, we need to refer to Notification 13 , and Notification 20 and the following construction is arrived:
Option 1: Pay GST at 5% under RCM and do not claim Input of the same.
Option 2: Pay GST at 12% under RCM and Claim Input of the same.
Also note the relaxation limit of Rs.750/1500.