(20)In the case of the hiring out of movable tangible property, application of the general rule that supplies of services are taxed in the Member State in which the supplier is established may lead to substantial distortion of competition if the lessor and the lessee are established in different Member States and the rates of taxation in those States differ. It is therefore necessary to establish that the place of supply of a service is the place where the customer has established his business or has a fixed establishment for which the service has been supplied or, in the absence thereof, the place where he has his permanent address or usually resides.