Liability to pay central tax on promoters receiving development rights or long leases arises on completion or first occupation. Notification under section 148 notifies promoters who receive development rights or FSI, or long term leases for residential construction, as persons in whose case liability to pay central tax arises on consideration paid in the form of construction services, monetary consideration for development rights or FSI, and upfront amounts for long term leases. The tax liability is triggered on issuance of the completion certificate where required or on first occupation, whichever is earlier. Key terms follow definitions in the Real Estate (Regulation and Development) Act; FSI and RREP are specifically defined and the reverse charge mechanism under an earlier notification is affirmed.