What it does
The Seat of Government Act 1908 (Cth) is one of Australia's earliest pieces of federal legislation. Enacted just seven years after Federation, its central function is to determine the location of the Seat of Government of the Commonwealth. Section 3 declares that the Seat of Government shall be in the Yass-Canberra district of New South Wales. Section 4 fixes the minimum territorial requirements: the territory to be granted to or acquired by the Commonwealth must contain an area not less than 900 square miles and must have access to the sea. Section 5 confers entry and survey powers to enable the boundaries of the proposed federal territory to be identified.
These three operative sections together gave legal effect to s 125 of the Constitution, which requires Parliament to determine the Seat of Government within NSW and at least 100 miles from Sydney, and which contemplates that the territory will be "granted to or acquired by the Commonwealth."
The Act is historically significant as the foundational statutory instrument that determined Australia's capital city. The political context of the Act was the long-running contest between Sydney and Melbourne over which city would be Australia's capital. The Constitution resolved that contest by mandating a separate territory, but left it to Parliament to choose the location. The choice of the Yass-Canberra district reflected both geographical compromise and the stipulation that the capital be at least 100 miles from Sydney.
The Act completed its primary purpose in 1908-1911, when the territory was surveyed, the grant from NSW was accepted under the Seat of Government Acceptance Act 1909 (Cth), and the Australian Capital Territory was formally transferred to the Commonwealth on 1 January 1911. Canberra was designed and construction began in the following decade. The Act has not been repealed because it remains the formal statutory basis for the determination of the Seat of Government, even though that determination is long since given effect.