imposing duties of customs and excise, shall deal with one subject
of taxation only. This point was directly taken in Osborne V. The Commonwealth 1, but was overruled. Referring to the argument based on secs. 36 and 40, I said 2--1 think with the concurrence of all members of the Court-" the case of each of those sections the provision, if valid, may render a person liable, directly or indirectly, for land tax upon land in which he
LAND TAX,
has no estate legal or equitable. But whether that provision is valid or not, the subject matter of taxation is still land. The utmost effect is that an ineffectual attempt is made to strike a man who cannot be struck."
The provision now attacked cannot, therefore, be supported on the ground that it is within the general power to impose taxation in respect of subject matters other than land.
It was contended for the Commissioner that husband and wife are in law and in fact one person, and that the Parliament, act- ing on this view, can impose on either an obligation to pay taxes due by the other. The fundamental proposition is contrary to the fact, and no argument can be based on it.
In considering the question of the validity of a federal Act the Court has regard to the substance of the matter. In my judg- ment sec. 36 is in substance an attempt to impose a pecuniary liability as a consequence of a transfer of land by a husband to his wife, or by a wife to her husband, which is pro tanto imposing a restraint upon such dealings, and the question is whether the Parliament has power to do SO. The relations of husband and wife, and the conditions of the transfer of land, as well between them as between them and other persons, are matters which, by the Constitution, are left to the States, and with which the Parliament has no authority to interfere.
It was next sought to support the section as a provision inci- dental to the collection of land tax, that is, incidental to the prevention of evasion of the tax-in other words, that it is in the nature of a penalty. But the penalty or obligation is not made dependent upon any evasion or attempted evasion of the Act, but upon the mere fact of transfer, which is a lawful act, and which the Parliament has no power to declare unlawful. The fact that
112 C.L.R., 321.
212 C.L.R., 321, at p 340.