Gst on government contract

" I want to know that Shouldi Charge GST on Rent or RCM is to be paid by Service Provider?"

If the agreement specifies taxes extra, then you can charge GST over and above your rental services.

Learned member, i got registered in GST on july 29 (fresh registration) and started doing business from 6 August . I am a service provider (lodge,hotel/fooding) Due to confusion i opted for composition scheme and before starting business i got to know that i did not fall under composition scheme. There were no option to opt out from Composition. So i started commencing my business as a regular taxpayer(charing taxes,following procedure as regular taxpayer) i opted out of composition scheme when the portal opened. Opted date is 4 october. I filed july, august, september, october and november GSTR3B (even i had to paid fine for the month of august). Now i received mail from gst department that i opted out of compostion scheme on oct 4 so i need to file GSTR4 from 29 july to 3 october.  I have been regularily filing gstr3b and already filed gstr3B for the months which i am told to file gstr4. I am really confused what to do now.  Kindly reply with the solution. I shall be highly grateful to you.