Reverse charge on development rights and FSI makes promoters liable to pay Union Territory GST by project completion or first occupation. Notification makes specific promoters liable to pay Union Territory GST when development rights or FSI are acquired against construction services or monetary/upfront consideration; tax is payable by the promoter in the tax period not later than that in which the project completion certificate is issued where required or the date of first occupation, whichever is earlier. Definitions for apartment, promoter, project, REP, RREP, and FSI follow the Real Estate (Regulation and Development) Act, and covered services remain subject to reverse charge as per the relevant rate notification.