In addition to Mr. Akshay advise, it is also to be noted that, after you make a payment, in the same month you can avail of input tax credit and setoff against output liability.
RCM would be applicable in this case under Section 9(3) of the CGST Act 2017 read with Notification No. 13/2017 - Central Tax (Rate), dated 28.06.2017.