In this action the Municipal Council of Sydney claims to recover from the Commonwealth municipal rates in respect of land situate within the City of Sydney, and occupied by the defendants for the purposes of the Departments of Customs, Posts and Telegraphs, and Defence, the land having become vested in the defendants by virtue of sec. 85 (1) of the Constitution upon the transfer of those departments to the Commonwealth. The defendants claim that the rates in question, which were made since the date of transfer, are within the prohibition of sec. 114, which provides that "a State shall not without the consent of the Parliament of the Commonwealth ... impose any tax on property of any kind belonging to the Commonwealth." For the plaintiffs it is contended, first, that a municipal rate is not a tax within the meaning of sec. 114, and, secondly, that, if it is, the provisions of the Sydney Corporation Act 1879 , by which (sec. 103, re-enacted as sec. 110 of the Sydney Corporation Act 1902 ) (1902 No. 35) Crown lands were expressly declared to be liable to rates, were continued in force by sec. 108 of the Constitution until the Parliament of the Commonwealth should think fit to legislate in a contrary sense, when, it is said, the provisions of sec. 109 of the Constitution would come into operation, and the State law, being inconsistent with the Federal law, would cease to have effect. No such Federal law has yet been passed. A subsidiary contention was that, in determining whether the rate, assuming it to be a tax within the meaning of sec. 114, was valid or not, regard should be had to the date of the passing of the New South Wales Statute, and not to the dates when the particular rates in question were made, and that, therefore, the rates for 1901 and 1902, made under the Act of 1879, which was passed before the establishment of the Commonwealth, were valid, even if those made under the Act of 1902 were invalid, which, however, was not conceded. There can be no doubt that the right of taxation is a right of sovereignty. It may be exercised upon all persons, and in respect of all property, within the jurisdiction of the sovereign power which exercises it. Municipal taxation springs from this sovereign right, and is an exercise of it by delegation to the municipality. No other origin for it can be suggested. It follows that if the authority which assumes to create such a delegation does not itself possess the power, the delegation is void, since the spring cannot rise higher than its source. A municipal corporation, therefore, cannot have any greater power to impose taxation than the State by which it is created, and by which its own powers are conferred. It is true that the word "tax" is sometimes used in the limited sense of an enforced levy for the purposes of the general government, but, if a State itself has no power to make such a levy, it cannot confer the power under another name. In a constitutional instrument, therefore, defining and limiting the power of constitutional authorities, the word "tax" must be construed in the wider sense, and a prohibition of the imposition of a tax must be held to include a prohibition of any such imposition by a delegated authority, by whatever name the tax is called. The Sydney Corporation Act does not, of itself, purport to impose rates, but merely requires the Municipal Council to make an annual assessment of the values of land within the municipality, and to make an annual rate of such amount as they think proper, within prescribed limits. The grant of the power, which is the act of the State, and the exercise of the power, which is the act of the corporation, are essentially different. The Statute operates as a delegation of the taxing power of the State, coupled with a direction when and how to use it. The assessment of land and the striking of a rate together operate as municipal legislation in exercise of the power. It is clear, therefore, that under this Act the imposition of a rate is the act of the corporation, and not of the State, and that the tax is imposed from time to time when the rate for the year is made. It follows that the prohibition of sec. 114, if applicable, applies to the rate for every year in which it is sought to levy it.