Yes. RCM is applicable as per Sections 13 and 14 of CGST Act. Relevant portions are extracted below:-
SECTION 13. Time of supply of services. - (1) The liability to pay tax on services shall arise at the time of supply, as determined in accordance with the provisions of this section.
(3) In case of supplies in respect of which tax is paid or liable to be paid on reverse charge basis, the time of supply shall be the earlier of the following dates, namely :-
(a) the date of payment as entered in the books of account of the recipient or the date on which the payment is debited in his bank account, whichever is earlier; or
(b) the date immediately following sixty days from the date of issue of invoice or any other document, by whatever name called, in lieu thereof by the supplier :
SECTION 14. Change in rate of tax in respect of supply of goods or services. - Notwithstanding anything contained in section 12 or section 13, the time of supply, where there is a change in the rate of tax in respect of goods or services or both, shall be determined in the following manner, namely :-
(a) in case the goods or services or both have been supplied before the change in rate of tax, -
(i) where the invoice for the same has been issued and the payment is also received after the change in rate of tax, the time of supply shall be the date of receipt of payment or the date of issue of invoice, whichever is earlier; or
(ii) where the invoice has been issued prior to the change in rate of tax but payment is received after the change in rate of tax, the time of supply shall be the date of issue of invoice; or
(iii) where the payment has been received before the change in rate of tax, but the invoice for the same is issued after the change in rate of tax, the time of supply shall be the date of receipt of payment;