IXL Timbers Pty Ltd v Attorney-General (Tas)

IXL Timbers Pty Ltd and the Attorney-General for Tasmania were parties to proceedings before the High Court of Australia concerning the validity of certain Tasmanian legislation. The dispute centred on the constitutional validity of the *Timber Marketing Act 1967* (Tas) and its purported effect on a contract between IXL Timbers and the Tasmanian government for the supply of timber. IXL Timbers challenged the Act, alleging it unlawfully interfered with contractual rights and was beyond the legislative power of Tasmania.

The central legal issue before the High Court was whether the *Timber Marketing Act 1967* (Tas) was a valid exercise of the legislative power of the Tasmanian Parliament, or whether it was invalid for reasons of constitutional repugnance, specifically in relation to the implied freedom of interstate and international trade and commerce guaranteed by s 92 of the Australian Constitution. The court was required to determine if the Act imposed an undue burden on or prohibition of interstate or overseas trade and commerce in timber.

Windeyer J, in his judgment, reasoned that the Act, by its operation, imposed restrictions on the marketing of timber that were not justified by any legitimate public purpose and that these restrictions had the effect of hindering or preventing the free flow of timber in interstate and overseas trade. His Honour applied the principles established in cases concerning s 92 of the Constitution, which protect freedom of trade, commerce, and intercourse among the States. The Act was found to impose discriminatory burdens on trade, thereby contravening the constitutional guarantee.

The High Court found the *Timber Marketing Act 1967* (Tas) to be invalid and made orders accordingly.