Notification No. 22/2019 prescribes that when the supplier charges GST at 5% and issues an invoice to a body corporate, the liability shifts under RCM. Importantly, this notification does not restrict the supplier from opting to bill the body corporate at 18%. If such a restriction were implied, it would effectively mean that cab services could only be supplied at a single rate of 5%, which is not the case in practice.
For reference, Notification No. 15/2025 prescribes the rate of 18% (amended from 12% to 18%). Therefore, if we accept the interpretation that services provided to a body corporate are always liable to GST at 5% under RCM, then the rate notification itself should have explicitly stated that the 5% rate applies only to supplies made to non-body corporates.
I have not found any provision in the GST rules that restricts cab service providers-unlike GTA operators-from choosing only one rate, i.e., either 5% without ITC or 18% with ITC. In the case of GTA, the notification specifically requires the service provider to opt for one option and submit a declaration at the beginning of the year. However, no such requirement exists for cab services.
Further, as explained above, Notification No. 22/2019 does not impose any restriction that billing to a body corporate must necessarily be under RCM. In addition, if we refer to the explanation provided in Notification No. 15/2025 (rate notification), it clearly states that where common credit is used partly for such supplies and partly for other supplies eligible for ITC, the ITC must be reversed by treating supplies taxed at 5% as exempt. This language strongly indicates that cab service providers can exercise both options during the year.