NatuRe of an award of interest
14 In Hungerfords the High Court considered the award of interest as damages independent of any statutory provision but also considered the nature of an award pursuant to statute. Mason CJ and Wilson J said at 147-8 (concerning interest pursuant to the South Australian legislation):
We see no reason for construing (the section) in such a way that it forecloses the authority of the courts to award damages in accordance with the principle established by Hadley v Baxendale and the measure of damages governing claims in tort. The section is not intended to erect a comprehensive and exclusive code governing the award of interest. It is a provision intended to provide a plaintiff with some protection against the late payment of damages. The section does not attempt to regulate the measure of compensation to be awarded for a specific head of loss. …
15 At 149, their Honours considered the possibility of recovering interest by way of damages rather than pursuant to such a legislative provision, observing:
But we see no reason for allowing the reluctance of the common law to extend to cases where the defendant's breach of contract or negligence has caused the plaintiff to pay away or the defendant to withhold money and, as a result, the plaintiff has been deprived of the use of the money so paid away or withheld. The recovery of compensation for the loss may be ascribed to the operation of the second limb in Hadley v Baxendale. However, we would prefer to put it on the footing that it is a foreseeable loss, necessarily within the contemplation of the parties, which is directly related to the defendant's breach of contract or tort.
16 Similarly, Brennan and Deane JJ said at 152:
There is, in our view, a critical distinction between an order that interest be paid upon an award of damages and an actual award of damages which represents compensation for a wrongfully caused loss of the use of money and which is assessed wholly or partly by reference to the interest which would have been earned by safe investment of the money or which was in fact paid upon borrowings which would otherwise have been unnecessary or retired. On the one hand, there is no common law power to make an order for the payment of interest to compensate for the delay in obtaining payment of what the court assesses to be the appropriate measure of damages for a wrongful act. If such interest is to be awarded at common law, it must be pursuant to statutory authority. On the other hand, there is no acceptable reason why the ordinary principles governing the recovery of common law damages should not, in an appropriate case, apply to entitle a plaintiff to an actual award of damages as compensation for a wrongfully and foreseeably caused loss of the use of money.
17 An award of interest pursuant to s 47 of the Supreme Court Act ("statutory interest") is in the discretion of the Court. It must choose an appropriate rate, identify whether interest should accrue on the whole or any part of the judgment and determine the period for which interest is to be awarded. The earliest possible date is that on which the cause of action arose; the latest possible date is the date of the judgment. In practice, awards pursuant to s 47 are made as a matter of course, adopting a rate of interest which is generally recognized as "current", identifying the time at which each aspect of the loss arose and the time for which it continued. However the exercise may be more complex in some cases. For example, in seeking statutory interest, a plaintiff might allege that he or she lost a particular investment opportunity or was forced to borrow at an unusually high rate because of his or her particular financial position. Those considerations would be relevant in the exercise of the discretion conferred by s 47, as they also would be in a claim of the kind contemplated in Hungerfords. Whilst the award of damages for lost earnings or capacity to earn focuses on the loss of income, the award of interest (pursuant to the statute or as damages) focuses on the plaintiff's likely use of his or her income. In most cases, a plaintiff who seeks an award of statutory interest will rely on the "broad brush" approach outlined above. Nonetheless, he or she is still seeking either the cost of borrowing or the value of a lost opportunity to invest.