Discussion
38 The contract provided that the price included any GST payable by the vendor, although that said nothing of whether GST was payable by the vendor or how much GST was payable. It provided for giving a tax invoice, as to which the same may be said.
39 The contract then allowed statements to be made in the boxes relevant to the provisions of the Act earlier described. This gave a starting-point for whether GST was payable by the vendor and how much GST was payable, a matter of common but potentially divergent interest for the reasons which gave rise to the parties' differing views. But it was not the end-point. Clause 13 then provided more specifically for adjustment between the vendor and the purchaser according to the GST in fact payable by the vendor.
40 Clause 13 began by affirming that the price was normally inclusive of GST, and gave promissory force to that position (cl 13.2).
41 Passing over the particular provision in cl 13.3 in relation to incidental payments, of which no mention was made in submissions, cl 13 then provided for adjustment as between vendor and purchaser if the starting-point statements were not correct. Rearranging their order, it did so as follows.
42 First, it dealt with the statement that the sale was or was not a taxable supply. If it was stated that the sale was not a taxable supply, it sought to protect the vendor from the purchaser's status or conduct, including non-disclosure, resulting in a GST liability (cl 13.7, 13.8). The protection included payment by the purchaser to the vendor, in the events in cl 13.8, of 10 per cent of the price if the sale was taxable supply. The evident assumption was that the price had been struck without a GST uplift on the basis that the supply of the property was not a taxable supply, and the evident purpose was that if the basis was falsified the purchaser should pay the vendor the amount of the GST which the vendor was liable to pay. If it was stated that the sale was a taxable supply, it sought to protect the purchaser from the vendor's enrichment if that were incorrect (cl 13.9). The evident assumption was that the price had been struck with a GST uplift on the basis that the supply of the property was a taxable supply, and the evident purpose was that if the basis was falsified the vendor should pay the purchaser the amount of the GST which the vendor was not liable to pay.
43 Secondly, cl 13 dealt with the statement that the margin scheme did or did not apply to the property. It enforced the default negative in the statement and made it promissory (cl 13.5), and if the statement was positive also gave it promissory force (cl 13.6). If the contract "does not say the margin scheme applies to the property", which would be so if the yes box was not completed and by the default negative would mean that the contract said that the margin scheme did not apply to the property, the evident assumption was that the price had been struck with a full GST uplift on the basis that the margin scheme did not apply. One would think the purpose was that if the basis was falsified the vendor should pay the purchaser the amount of the GST which the vendor was not liable to pay. The amount to be paid by the vendor to the purchaser, however, was not the amount of the GST which the vendor was not liable to pay. It was the full one-eleventh of the price.
44 Thirdly, cl 13 provided for giving a tax invoice on completion "for any taxable supply by the vendor by or under this contract" (cl 13.10). The assumption appears to have been that the true GST position would be known by completion, hence the payments in cll 13.8 and 13.9 were to be made on completion.
45 As has been seen, the Act provides for a supply which is in part a taxable supply and in part not, and for the margin scheme where the land supplied is part only of the land acquired. There may be apportionment of the value of the supply or the consideration for the supply. However, the terms of the contract were unitary. It had one price for the property. It referred to "this sale" being or not being a taxable supply, and in many places cl 13 took up "this sale" or "the supply" of the parcels. It referred to the margin scheme applying to "the property" or "the supply of the property". In cll 13.4.4, 13.8 and 13.9 the payment was expressly a full 10 per cent of the price or one-eleventh of the price, not some reduced amount according to a partial taxable supply or according to lesser GST because of the margin scheme.
46 The purchaser first submitted that cl 13.9 should be read distributively, so as to apply if and to the extent that the sale was not a taxable supply. It said that, construing the contract in the light of the operation of the Act, there should be taken up the apportionment which the Act allowed, and that cl 13.10 recognised that GST might not be attracted by the supply of the whole of the subject-matter of the sale in the words "for any taxable supply". The result, on the purchaser's argument, was that the vendor was obliged to pay it the $298,795.
47 I do not think this can be accepted. To give cl 13.9 a distributive operation, more would be necessary than reading the words "and to the extent" into cl 13.9.1. The stipulated payment of one-eleventh of the purchase price would also have to be changed, lest the adjustment go too far in favour of the purchaser. A similar reading-in and change to the 10 per cent would be required in cl 13.8 (and probably also in cl 13.3). The changes would involve radical re-writing of the agreement expressed in cl 13, more than construction of the contract allows.
48 Further, the distributive operation would distort a contract which in many other places referred to the sale being or not being a taxable supply, as I have said in unitary terms. The contract did not say that the sale was to a particular extent a taxable supply or not a taxable supply. Looking only at cl 13.9, the first reference to the contract saying that "this sale is a taxable supply" was to an all or nothing statement, and when cl 13.9.1 postulated that "this sale is not a taxable supply" it must also have meant an all or nothing position. Similarly as to the margin scheme.
49 The purchaser then submitted that, on the words of cl 13.9 without embellishment, the requirement in cl 13.9.1 was satisfied in that, because only the supply of 4a Rutledge St was a taxable supply, "this sale" was not a taxable supply. On this argument, the vendor was obliged to pay the purchaser the $354,545. If that meant over-adjustment in favour of the purchaser, it was a consequence of an unsatisfactory contract of which the vendor could not complain.
50 It may equally be said, as the vendor submitted, that the requirement in cl 13.9.1 was not satisfied in that, because the supply of 4a Rutledge St was a taxable supply, "this sale" was a taxable supply. Similar alternative views would be open as to the margin scheme. It could be said to apply to the property in that one of the parcels had been acquired through a taxable supply under the margin scheme, or it could be said not to apply to the property in that one of the parcels had not been acquired in that way.
51 The contract took an all or nothing approach. It did not provide for a partial taxable supply or partial application of the margin scheme. It is nonetheless necessary to decide how it operates in the case of a partial taxable supply and to attempt to do so on a rational basis. In my view that basis is that, cl 13.9 referring to an all or nothing position, the negative in cl 13.9.1 is satisfied only by nothing. Payment is not triggered unless the sale is not at all a taxable supply, a result which makes sense because in that event the payment of the full one-eleventh of the price is appropriate.
52 The contract can be said to operate harshly against the purchaser, but the opposite result would operate harshly against the vendor. Clause 13 otherwise lacked refinement. The apparent assumption that the true GST position would be known by completion may have been unwarranted. There could be harsh operation one way or the other under cl 13.8, inappropriate adjustment in the case of the margin scheme was inevitable.