A distinction must first be drawn between the concept of consideration in the law of contract and the statutory definition of consideration in the GST Act. Whereas UK precedents have held that consideration ought to bear its ordinary meaning under English Law (see Theatres Consolidated Ltd v The Commissioners [1975] VATTR 13), I am of the view that the contractual doctrine of consideration is wider than the intended scope of the word “consideration” in s 17(3) of the GST Act for several reasons. The doctrine of consideration in contract at common law is concerned with the regulation of the formation and enforceability of contractual relationships rather than the valuation of the obligations owed under the contract. On the other hand, consideration in revenue law is concerned not only with the taxability of a supply, but the taxable value to be ascribed to a supply. Consideration in revenue law is thus concerned with the question of “what was the payment in the taxable transaction?”, and not, “was there sufficient consideration furnished for that transaction to be valid and binding?” Seen in this light, it becomes clear why the rules of consideration that apply to contract law cannot be directly applied to revenue law. For example, it is accepted in contract law that consideration must move from the promisee to the promisor: see Gay Choon Ing v Loh Tze Ti Terence Peter and another appeal [2009] 2 SLR(R) 332 (“Gay Choon Ing”) at [66]. However, in revenue law, it is well accepted that consideration for a supply may be furnished by a third party: see the UK Supreme Court decision of Airtours Holidays Transport Ltd v Revenue and Customs Commissioners [2016] 4 WLR 87. Furthermore, the fact that consideration is non-existent because a contract was executed by way of deed is no bar to the imputation of open market value to that taxable supply under the GST Act. Finally, and of particular relevance to this appeal, once consideration is sufficient for the purposes of contractual formation, contract law is not concerned with the issue of adequacy of consideration, its valuation, and the form which it takes – monetary or non-monetary. Conversely, the scrutiny of its exact contents and value in revenue law is fundamental to the assessment of the value of any taxable supply.