It may well be that there is no constitutional objection to a provision requiring the registration of motor vehicles, including motor vehicles which are originally registered in other States and enter New South Wales from other States. Again, it may well be that the requirement of registration will not be invalidated by the mere fact that a uniform fee is made payable on registration: all States require payment of a fee on registration, and, unless some affirmative reason appeared for regarding it as a real burden or impediment on inter-State trade, the exaction of a fee as a mere incident of registration may be said not to offend against s. 92: cf. Willard v. Rawson [38] . But the exaction imposed by the Management Act and the Taxation Act cannot be regarded as a mere incident of registration regarded as an object in itself. What is imposed by those Acts is a real and very substantial tax on motor vehicles. The levying of a pecuniary impost is the end in view, and the impost is made payable on registration only because that is a convenient means of ensuring its collection. When we look at the actual operation of the legislation in relation to commerce, we cannot, I think, avoid saying that it does impose a real and direct burden on the carrying on of commerce in a particular way. And, if that is so, it cannot, consistently with s. 92, operate in respect of the carrying on of inter-State commerce.
The fact that that tax was imposed on registration and renewal and that the tax now in question is imposed on registration and transfer of registration is a trifling and immaterial difference. Moreover the present tax is not distinguishable from the tax dealt with in Armstrong v. Victoria [No. 2] [39] ("Armstrong [No. 2]") which dealt with s. 6, especially sub-s. 4, of the Motor Car Act 1951 Vict.. The words used by Dixon C.J., are directly applicable to the present tax [40] :
It appears to me that on a proper scrutiny of Pt II of the Motor Car Acts 1951-1956 Vict. and the second schedule it must be seen that no room exists for the grounds upon which it has been sought to reconcile with s. 92 the imposition upon vehicles exclusively engaged in inter-State commerce of the rates contained in sub-par. (b) of par. B of the schedule. (1) The exaction cannot be regarded simply as a fee contributing to the cost of registration a service in the interest of motor car owners and drivers and others so that it is nothing but an incident or adjunct of the traffic. (2) It cannot be treated as another contribution to the maintenance of the highways compensatory for the use made of them. (3) It cannot be justified as a tax upon the ownership or possession of a chattel considered independently of the use of the chattel in the carriage of persons or goods, including the inter-State carriage of persons or goods. (4) It cannot be treated as involving no appreciable burden upon the possession of a motor vehicle as a means of inter-State carriage and movement.