The basis of restitution with interest of moneys paid under a judgment later set aside
12 A party's right to restitution with respect to moneys paid under a judgment later set aside, together with interest thereon, is well established (see generally Mason and Carter, Restitution Law in Australia, ch 7. See also Supreme Court Rules Pt 51 r26).
13 There is however some uncertainty as to the juridical basis of the right to restitution of moneys paid under judgments later reversed or set aside, in particular the right (if any) to interest. In mentioning interest I am referring to interest upon the capital sum paid over by the ultimately successful party: such capital sum will usually involve a composite amount that includes the judgment debt (which in turn may have included interest pursuant to s94 of the Supreme Court Act or its equivalent) plus interest accruing thereon pursuant to s95 or its equivalent. Money paid in relation to a costs order may also be included.
14 Some have looked to statutes and rules as the source of the power to award restitution with interest. In my opinion, the right exists at common law and is not based upon some discretionary invocation of statutes or rules relating to appeals. It is based on the "unifying legal concept" of unjust enrichment identified by Deane J in Pavey & Matthews Pty Ltd v Paul (1987) 162 CLR 221 at 256-7. My views are developed in detail in Mason and Carter, Restitution Law in Australia 1995, especially chapters 7 (Judgments Reversed or Set Aside) and 28 (Interest). In brief, restitution is available regardless of the means whereby the judgment is discharged; and restitution with interest is the right of the ultimately successful party (see esp Rodger v Comptoir d'Escompte de Paris (1871) LR 3 PC 465, Commonwealth v McCormack (1984) 155 CLR 273 (McCormack), TCN Channel 9 Pty Ltd v Antoniadis (No 2) (1999) 48 NSWLR 381).
15 Notwithstanding statements by the highest courts that the common law does not allow interest on recovery of money in claims for debt or damages (see, eg Victorian Workcover Authority v Esso Australia Ltd [2001] HCA 53 at [23], [86] where such a statement appears with qualifications that are not presently relevant) there are many cases of undoubted authority where this has happened. I venture to repeat what I wrote in National Australia Bank Ltd v Budget Stationary Supplies Pty Ltd (NSWCA 23 April 1997, unreported):
The common law's attitude to interest on debts is confused and largely negative. London, Chatham & Dover Railway Co v South Eastern Railway Co [1893] AC 429 is frequently cited as authority for the proposition that damages are not payable for late payment of a debt. (For present purposes, I include both contractual and restitutionary obligations to pay a money sum as falling within the concept of "debt".) It is generally stated that interest will only be added if there is express agreement, an implied agreement arising from a course of dealing between the parties, or clear custom (see eg Halsbury's Laws of England 4th ed; vol 32, "Money" para (108)). In London, Chatham, the House of Lords felt reluctantly constrained by what was recognised to be an unsatisfactory stream of earlier authority supporting these propositions. It cited earlier cases supporting such a view and offering as the rationale the difficulty of juries assessing interest as part of damages (see eg Page v Newman (1829) 9 B 378; 109 ER 140). The limited statutory redress obtained by Lord Tenterden's Act of 1833 ( Civil Procedure Act 1833 (UK) , s28. The Act required a written demand claiming interest. The New South Wales counterpart became s140 of the Common Law Procedure Act 1899 , which remained until the enactment of s94 of the Supreme Court Act 1970 ) was viewed as confirming the torpor of the common law. To this day, one may find many statements citing London, Chatham as fixing the common law and stating a universal proposition against the award of interest (by way of damages or otherwise), save in the exceptional situations to which I have already referred. (See, eg Bayne v Stephens (1908) 8 CLR 1 at 23; Marine Board of Launceston v Minister for the Navy (1945) 70 CLR 518 at 525, 529; Mathew v TM Sutton Ltd [1994] 1 WLR 1455. For a recent statement see Andjelic v Marsland (1996) 186 CLR 20 at 36 per McHugh and Gummow JJ. Contrast Hungerfords v Walker (1988) 171 CLR 125 at 138 where Mason CJ and Wilson J pointedly described London, Chatham as stating the common law "in England").
But there have always been streams of cases of undoubted authority which simply walked around any such general principle. Some involve restitutionary obligations, although this does not appear to be the basis upon which the "London, Chatham principle" was bypassed. Thus, interest at common law has been awarded for money had and received, where the facts would have supported an equitable claim for account ( Bayne v Stephens (1908) 8 CLR 1), where restitution follows the reversal on appeal of a previously satisfied judgment ( Rodger v The Comptoir d'Escompte de Paris (1871) LR 3 PC 465; Commonwealth v McCormack (1984) 155 CLR 273; National Australia Bank Ltd v Bond Brewing Holdings Ltd (1991) 1 VR 386 at 597….) where damages are awarded under the rule in Bain v Fothergill ((1874) LR 7 HL 158. See Day v Singleton [1899] 2 Ch 320; Ashok Trading Pty Ltd v Kintay Pty Ltd [1983] 1 Qd R 273); and where a contract has been discharged for breach, repudiation or in exercise of a contractual right (see eg Elder's Trustee and Executor Co Ltd v Commonwealth Homes and Investment Co Ltd (1941) 65 CLR 603; Lexane Pty Ltd v Highfern Pty Ltd [1985] 1 Qd R 446 at 461-2). One might be pardoned for thinking that this litany of "exceptions" to the London, Chatham principle goes a long way towards eating up the general rule. In all of these cases, interest was awarded at common law and computed from the date of receipt of moneys ordered to be repaid, even where (in cases unlike the present) the restitutionary cause of action leading to the obligation to repay the "principal" may have arisen later. Thus, it is well established that where a contract is terminated for breach by the vendor, the purchaser will recover the deposit together with interest from the date of original payment, even though termination does not operate ab initio. (See eg Sandeman v Wilson (1880) 1 LR(NSW) Ex 1; Delbridge v Low [1990] 2 Qd R 317 at 335.)