One of my friend is doing a proprietary business ( supply of service). Due to some personal reasons, he could not carry out his business for a few months. However, he promptly filed NIL return and his Registration is still active. But, as his place of business is located in a rented premises, he had paid the RCM regularly and that amount has accumulated in the Credit ledger. It might take a few more months for him to revive his business actively. Now, can he claim refund of his accumulated RCM? If so, what is the proceedure.