Continuous supply of service clarified as recurrent, contract-based services with periodic payments impacting point of taxation and invoices. The rules define continuous supply of service as services provided or agreed to be provided continuously or recurrently under a contract exceeding three months with periodic payment obligations, and allow government notification to designate particular services as continuous supplies. They treat change in effective rate of tax to include changes in the portion of value liable to tax by notification. 'Invoice' follows the Service Tax Rules' invoice document, and point of taxation marks when a service is deemed provided for tax purposes.