Did the appellant hold or acquire the necessary interest before 1 July 2000?
26 On this issue the Commissioner and the appellant parted company. But in our view, once the "precise juridical identity" approach is rejected and a more practical construction adopted, it is not possible to ring fence the interest the appellant acquired under the contract from the stratum unit which it later supplied to its customer.
27 The Commissioner argued that the stratum units which the appellant sold were not "derived" from the equitable estate it held as purchaser, rather they were derived from the fee simple estate it obtained on completion of the purchase and registration (although senior counsel for the Commissioner disavowed any argument that what was acquired or held was the registered interest). But that fee simple was not conferred on the appellant by the Lands Title Office without regard to anything the appellant had previously done to acquire it. The appellant was only able to complete the purchase and obtain registration because, by entering into the contract it had obtained or acquired enforceable rights against (and of course obligations to) the previous owner of the property. The contract was the genesis or source of the appellant's interest in the stratum unit it supplied. In the language of the Commissioner's submissions, the contract was the parent.
28 A vendor under an uncompleted contact for the sale of land is not now considered to be a trustee for the purchaser: Tanwar Enterprises Pty Ltd v Cauchi (2003) 217 CLR 315 at [53]. Nevertheless, by entering into the contract the appellant acquired a right enforceable by specific performance, and an asset which properly appeared on its balance sheet. It was entirely predictable, as it in fact happened, that on completion of the purchase, registration of title stratum units would come into existence (as is now common ground, it does not matter for present purposes that this coming into existence was not until after 1 July 2000).
29 The appellant's case is analogous to the approach adopted by a majority of the High Court in Federal Commissioner of Taxation v Suttons Motors (Chullora) Wholesale Pty Ltd (1985) 157 CLR 277. The majority held that "trading stock" included motor vehicles in which the taxpayer's only interest was that of a bailee in possession with an option to purchase. The Commissioner's argument (at 283) was that the taxpayer was not at the relevant time either the owner of the goods or under any legally enforceable obligation to buy them. The majority rejected this and implicitly also the contrary view of the dissentient, Brennan J, which was to this effect (at 289):
It is not to the point that the taxpayer dealt with the vehicles as though it had such a proprietary interest in them when, in truth, it did not. Nor is it to the point that commercial or accountancy practice would treat the taxpayer as the owner of the vehicles which were in its possession at any time and would treat GMAC as entitled to the hiring amount and other moneys referred to in cl 15 of the floor plan agreement.
30 There may be grounds for distinguishing Suttons Motors on the facts. Some of those grounds, however, show the present case is stronger; for example, the appellant had more than an option to purchase, it had an enforceable right and obligation to do so. More importantly, the approach manifested by the High Court is significant. The majority applied a taxing act in a way consistent with business practice and commercial reality. In Saga Holidays Ltd v Commissioner of Taxation (2006) 156 FCR 256 at [43] Stone J, with whom Gyles and Young JJ agreed, considered as relevant in a GST context reference to "social and economic reality"; see Lord Hoffman in Benyon and Partners v Customs and Excise Commissioners [2005] 1 WLR 86.
31 The Commissioner argued that Suttons Motors relates to other tax legislation (as indeed it does) and is of limited applicability in interpreting a new tax predicated on different concepts. However, one of those concepts is the policy decision that GST is only to be payable on the value added after 30 June 2000. This is the rationale for s 75-10(3): Explanatory Memorandum to the A New Tax System (Goods and Services Tax) Bill 1998 (Cth) at [6.100]. The interpretation advanced by the appellant gives effect to that policy and is consistent with the language of the statute.
32 A purchaser under an uncompleted contract has an "interest" recognised by the law in many different contexts. Such a purchaser has an insurable and caveatable interest. The appellant acquired that interest in the sense of obtaining, gaining or getting something: Allina Pty Limited v Commissioner of Taxation (1991) 28 FCR 203 at 209.
33 It was put by the Commissioner that accepting the appellant's case would not bring certainty because a contract of sale may not be completed. As will be seen, the answer to this submission is provided by the recent decision of the High Court in Commissioner of Taxation v Reliance Carpet Co Pty Ltd [2008] HCA 22.