According to section 17(2) of the CGST Act 2017, where the goods or services or both are used by the registered person partly for effecting taxable supplies including zero-rated supplies and partly for effecting exempt supplies, the amount of credit shall be restricted to so much of the input tax as is attributable to the said taxable supplies including zero-rated supplies.
Further, as per section 17(3), exempt supplyu/s 17(2) shall inter alia include supplies on which the recipient is liable to pay tax under RCM.
Additionally, as per Rule 42(1)(c)&(e) of the CGST Rules 2017, the amount of input tax paid on goods or services or both that are intended to be used exclusively for effecting exempt supplies shall not be credited to electronic credit ledger as ITC.
In the given case, since the outward supply of car is not taxable, i.e., recipient is liable to pay tax under RCM, therefore ITC of car purchased exclusively for renting and hiring service cannot be claimed.
However, if Mr A begins to charge tax of 12%, then he will not cover under entry 15 of N/No. 13/2017 - CTR and, therefore, shall become eligible to claim ITC, which can be utilised for discharging outward tax liability of either own vehicle car renting service, or condiments shop, or both.