Time of tax liability: state tax on development-rights and construction-service supplies arises on transfer of possession. Notification designates registered persons exchanging development rights and construction services such that the liability to pay state tax on those supplies, where consideration is partly or wholly in the form of construction service or development rights, arises when the developer or builder transfers possession or the right in the constructed complex, building or civil structure to the supplier of development rights by entering into a conveyance deed or similar instrument.