In this sense, the overriding principle is to provide the successful litigant with full justice and compensation for delay and not penalise the losing party. Thus, in Barclays Australia , above, Rolfe J said:
'The view I take as to the proper exercise of discretion on the facts of this case can...be put quite shortly and, I believe, in accordance with accepted principles. The defendants paid out money, quite properly, to their former solicitors as the litigation progressed. Subsequently, it was held that Barclays and Morgan were obliged to pay portion of that money to the defendants. The rationale behind the payment of interest is, generally speaking, that the party ultimately ordered to pay money, whether by way of damages, debt or costs has had the benefit of the money from the institution of the proceedings, that benefit being either that the party is not obliged to pay over money upon which it could be earning interest or which it could be using in its own commercial enterprise, or it has not been subjected to the burden of borrowing money on which it would be obliged to pay interest. In the present case both Barclays and Morgan were engaged in commercial activities and the only reasonable inference to be drawn is that moneys they did not have to expend on costs could be used in their businesses. They have had the advantage of either retaining or not having to borrow money whilst the defendants, to which and who the money is now payable, have been out of pocket. In all those circumstances the requirements of a proper indemnification demand the payment of interest as from the date when costs were paid to their solicitors'.
In Hughes Bros , above, Foster A J said that the principles upon which such an order may be made 'are founded upon common sense and justice.' Foster A J also stated the rationale as being the need to compensate the successful litigant--
'In circumstances where a successful party has outlaid, from an early stage and often continuously, amounts of money, by way of payments to his legal representatives to finance the conduct of the litigation, he will, manifestly, be significantly out of pocket if he receives, by way of reimbursement of this payments, only an amount of taxed or assessed costs at a far later stage, after he has successfully prosecuted the litigation to finality. Such a financial detriment can only be compensated by the making of an appropriate award of interest to be paid in respect of those payments, providing, of course, that the relevant payments can be properly allocated to the successful outcome of the litigation in whole or in part.'
Similarly, in Maronis Holdings Ltd , above, Bryson J said (at para 30):
'The Second Defendant and the Seventh Defendants have each sought an award of interest on costs. I regard it as appropriate to award interest in exercise of the power in subs 95(4) of the Supreme Court Act 1970 so that interest is to be paid on amounts of costs paid from the dates when amounts in respect of costs were paid. I regard this as appropriate because the interlocutory stages of the litigation and the hearing were very protracted, largely because of the conduct of the plaintiffs and complexities arising out of the plaintiffs having made many amendments to their pleadings. It would in my view be unjust that the defendants should not recover any interest in respect of the period between the dates, which could now be over six years ago, when they were called on to pay costs to their own representatives and the date when an order for costs is made.'
More recently in Grogan v Thiess Contractors Pty Ltd [2000] NSWSC 1101 Barr J confirmed (at para 12) that the legislative purpose behind s 95(4) 'is not to penalise but to recompense a litigant for being out of pocket whilst the other side has had the use of the money.'.