23 Principles which inform the exercise of the discretion to award a specified gross sum were considered in Idoport Pty Ltd v National Australia Bank Ltd [2007] NSWSC 23 by Einstein J and are stated in the headnote as follows:
"(1) The purpose of the jurisdiction to award costs as a gross sum is to avoid the expense, delay and aggravation involved in protracted litigation arising from the taxation of costs. A gross sum assessment, by its very nature, does not envisage a process similar to a traditional taxation or assessment.
(2) The court must be confident that the approach taken to estimate the claimed costs is logical, fair and reasonable. It must prevent prejudice to the unsuccessful party by overestimating the costs, while at the same time avoiding an injustice to the successful party by applying an arbitrary fail safe discount on the estimate submitted to it.
(3) The fairness parameter includes the court having sufficient confidence in arriving at an appropriate sum on the materials available: the gross sum can only be fixed broadly having regard to the information before the court.
(4) Nevertheless, the power to award a gross sum must be exercised judicially, by reference to the particular case before the court, and after giving the parties an adequate opportunity to make submissions on the matter.
(5) It is not arbitrary exercise of the judicial power for the court to weigh up competing factors and make a determination even if the task cannot be undertaken in a mathematical, precise or formulaic manner.
(6) In applying a broad approach to gross sum awards, courts have invariably applied a discount to amounts claimed.
(7) The exercise of the power to award gross sum costs should rest with the trial judge, whose familiarity with the proceedings aids in the making of a "logical, fair and reasonable" estimate.
(8) The present proceedings were far removed from an ordinary commercial case, involving wide-ranging, complex and fluid issues and a substantial volume of evidence on both sides. Faced with a claim of the size made by the plaintiff (which exceeded the defendant bank's net worth), the defendants were plainly entitled to defend themselves with all the energy and resources at their command.
(9) The work carried out on behalf of the defendants, although it involved a "Rolls Royce" approach, was called for in the circumstances of the case.
(10) There was sufficient evidence before the court to come to a "logical, fair and reasonable" conclusion.
(11) Applying the discount referred to in the authorities, the defendants were entitled to gross sum costs in the amount of $50 million."