One of my friend is filing GST returns on Monthly basis. He is paying RCM on Rent. At present, there is no turnover and is filing only NIL return and paying the RCM every month. He prefers to switch over to Quarterly return filing from July onwards. On doing so, can he pay the RCM on rent for that quarter once in 3 months, along with the 3B return ? Or, should he pay the RCM every month, not waiting for the 3B return.