query

Service tax is a central leavy and VAT is a state leavy. Service tax is a tax on services. VAT is a tax on goods sold. Both are exclusive. In some cases, both the service tax & VAT is chargeable. For example, Catering service.

in few cases both are chargeable .. for eg: a service provider (rent a cab service) giving car on lease will charge service tax and vat both in his bill. coz he is providing service as well as falls under deemed seller (leasor) category.