Tax liability on development rights arises on project completion or first occupation, triggering reverse charge for promoters. Promoters obtaining development rights or FSI, or long term lease of land for residential construction, who pay or provide consideration in the form of construction services, monetary payments, or upfront amounts, are liable for state tax on such supplies. Taxable events include consideration in construction services for development rights/FSI, monetary consideration for development rights/FSI for residential construction, upfront lease premiums for long term land lease, and supply of construction services paid by development rights/FSI. The tax liability arises on issuance of the completion certificate or on first occupation, whichever is earlier, and is payable on reverse charge basis as per the earlier notification.