Revenue recognition principles under Ind AS 18: when to recognise and how to measure revenue from sales, services, and asset use. Ind AS 18 prescribes recognition and measurement of revenue from sale of goods, rendering of services, and use by others of entity assets (interest and royalties), requiring recognition when future economic benefits are probable and measurable, measured at fair value of consideration with financing adjustments, and subject to specific criteria for transfer of risks and rewards, stage-of-completion accounting for services, and interaction with other Ind ASs (notably Ind AS 109 and Ind AS 37); appendices supply guidance on barter advertising, customer loyalty programmes, and transfers of assets from customers.