Those remarks apply equally to accounts between co-owners of land.
17 What the defendant is seeking to do here is to assume the result of the inquiry, in one respect; namely, whether the amount required to discharge the mortgage is to be borne wholly by the plaintiff.
18 It is part of the justification for the equity of exoneration that, when the obligations between surety, creditor and principal debtor are worked out, one can say with confidence, at the time the court makes an order, that it is the principal debtor who will end up being liable to pay. Equity avoids multiplicity of actions, by ordering that the inevitable eventual outcome of two different actions, by creditor against surety, and then by surety against principal debtor, be achieved straight away, without going through those two different actions, and without the surety suffering any financial disruption involved in first paying the creditor and then seeking reimbursement from the principal debtor. That is not the situation here. One simply cannot tell who it is who will be liable, following the account, to pay the amount required to discharge the mortgage.
19 Another principle comes into play here arising from the fact that the inquiry relates to more than who will ultimately bear the burden of paying out the mortgage. It is the principle concerning equitable set-off. In AWA Limited v Exicom Australia Pty Limited (1990) 19 NSWLR 705 Giles J at 710 to 711, considered the principles on which equitable set-off operated. His Honour said at 711:
"There must be something additional to the fact of a cross-demand to cause the court, in the exercise of its equitable jurisdiction, to require the plaintiff to set-off against his claim the claim of the defendant.
That requirement has often been expressed in language to the effect that the equitable set-off must go to the root of or impeach the title of the plaintiff's claim. What is meant by such phrases, particularly in the light of the more recent cases, itself needs explanation.
...[namely]...
'...so closely related as to subject matter that the claim sought to be set-off impeached the other in the sense that it made it positively unjust that there should be recovery without deduction.'"
20 If the outcome of the accounting were that the defendant was obliged to pay money to the plaintiff, in connection with topics other than the discharge of mortgage then, because the taking out of the mortgage was part of the transaction that the parties entered into concerning their use of this land, that claim could possibly, it seems to me, be able to be set off against the amount due under the mortgage. This provides a further reason why it is that one cannot be sure that, at the end of the day, as between the plaintiff and the defendant, the defendant will be entitled to have its share of the land free of any mortgage debt.
21 It is the effect of the mortgage that the defendant has granted to Westpac that, as between the defendant and Westpac, Westpac has every entitlement to be paid from the proceeds of sale. If Westpac were to be paid from the proceeds of sale, then the defendant would be in a situation where it does not have a property right against which to enforce any security interest that it might have. It is only if the defendant were able to bring into play an equity of exoneration, before Westpac satisfied itself, that this result would not arise. Yet, for the reasons which I have given, I cannot be satisfied, on the material which is now before me, that there is an equity of exoneration in the defendant's favour.
22 A second way in which Mr Charles sought to support the making of an order was by reference to the principles of subrogation. He says that if Westpac were to be paid out following the sale of the property, the defendant would then be subrogated to the mortgage, to the extent its interest in the land had been lessened by that payment out. It is well established that where a third party pays off a mortgage he is presumed, unless the contrary appears, to intend that the mortgage shall be kept alive for his own benefit: Ghana Commercial Bank v Chandiram [1960] AC 732 at 745.
23 It is to be observed that this principle is expressed in terms of a "third party" paying off the mortgage. In this context, a "third party" means someone besides the mortgagor and the mortgagee under the original mortgage. If it were to be the case that the debt owing to Westpac were to be satisfied from, in effect, the defendant's share of the mortgage property, in part, the defendant would not be a "third party" within this principle.
24 In Cochrane v Cochrane (1985) 3 NSWLR 403 Kearney J considered the situation where one of two co-mortgagors had paid off part of the mortgage debt. His Honour held that in that situation there was no equity to cause the mortgage to be kept alive. He said, at 405, that the principle whereby the third party can be subrogated to the mortgage it pays off:
"...is based on equity's concern to prevent one party obtaining an advantage of another which in the circumstances of the case is unconscionable...
As a corollary to this basis for the principle, there is no occasion for equity to intervene by way of subrogation where there is available to the third party a remedy at law or in equity sufficient to avoid an unconscionable result.
In the light of these notions I am unable to accept that the doctrine of subrogation applies to the case of repayment of a mortgage debt by a co-mortgagor in the absence of a very clear reservation expressly or impliedly of such right. Each co-mortgagor being primarily liable for the whole debt, adequate justice is done between them if one has to pay the whole debt, by his entitlement to contribution."
25 Mr Charles distinguishes that case by saying that, here, while it may be that both plaintiff and defendant are liable for the mortgage debt, the liability of the defendant is a secondary liability. Even if it is the case that there is no personal liability on the defendant at all to pay the debt to Westpac, its liability is still a secondary liability, in the form of being at risk of having its property taken to satisfy the mortgage debt.
26 It seems to me that in this situation the law has already provided, by the principles concerning exoneration, and the availability, sometimes, of a quia timet injunction, to require the early payment out of a mortgage debt secured over the property of a surety, for an appropriate adjustment of the rights of the parties. Just as the availability, in Cochrane v Cochrane, of the equity of contribution was sufficient to make it unnecessary to resort to an equity of subrogation to enforce the rights of one co-mortgagor against another, so here the availability of a right of exoneration and, sometimes, of a quia timet injunction in support of it, is sufficient for an equity of subrogation not to need to arise, except, possibly, in a situation where a quia timet injunction would have been available but was not applied for. However, for the reasons which I have earlier given, it seems to me that this is not a case where I can be satisfied that it is appropriate for quia timet relief to be given.
27 Ms Lane, for the plaintiff, also opposed the granting of relief on other bases. The first is that, she submits, it is necessary for a guaranteed debt to be due before an equity of exoneration arises. The evidence discloses that the trustees for sale, and Westpac, each make no requirement for the repayment of the mortgage debt prior to sale of the property.
28 The trustees for sale are, I gather, setting about putting the property to auction, but no auction date has yet been set.
29 It is consistent with the attitude which the trustees for sale and Westpac have displayed that, once the sale is completed, they will pay the Westpac debt out of the proceeds of sale of the land. If an equity of exoneration were otherwise available, I would regard that as a situation where it was sufficiently imminent, that the property might be sold to answer the guaranteed debt, for a quia timet order to be made. However, for reasons which I have already given, I do not think that the order is available.
30 Ms Lane also submitted that an order ought not be made for reasons of hardship on the plaintiff. In the circumstances that have arisen, it is not necessary for me to consider that submission. She also pointed out, correctly, that the evidence about valuation of the property proceeded on a basis of there being no remediation costs associated with the land, and that the values were different depending on the use a purchaser intended to make of the property. Those evidentiary matters do not affect the principles which I have based this decision on.
31 As well, the second alternative order sought is one which has considerable uncertainty in it. I do not expect that the trustees for sale are likely to be in much, if any, better position than I am to estimate the likely financial outcome of the accounting exercise between the parties. Again, however, in the circumstances of the view I have come to, it is not necessary for me to consider that further.
32 The order of the court is that the application is refused.
33 I order the applicant to pay the costs of the respondent.
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