Hasler v Singtel Optus Pty Ltd

The appeal and cross-appeals concerned a dispute between Mr. Hasler and Singtel Optus Pty Ltd. The proceedings involved allegations of breach of fiduciary duty and accessory liability for dishonest and fraudulent assistance. The matter was heard in the Court of Appeal of New South Wales.

The central legal issues before the Court of Appeal included the nature and scope of an employee's fiduciary duty, particularly when acting in a position of conflict, and the requirements for establishing accessory liability for dishonest and fraudulent assistance. The court was also required to consider the meaning of "dishonest and fraudulent design" in this context, and whether it was necessary to demonstrate knowledge of the absence of informed consent. Furthermore, the court had to determine the appropriate measure of equitable compensation for breaches of fiduciary duty.

The Court of Appeal applied established principles of equity and fiduciary law. It considered the high degree of deference owed to a trial judge's findings of fact, particularly concerning issues of dishonesty. The court analysed the elements of accessory liability, emphasising the need for a dishonest and fraudulent design on the part of the principal and knowing assistance by the accessory. The court also addressed the precedential status of decisions from other intermediate appellate courts, noting that departure from such decisions is generally not necessary unless it is essential for the resolution of the appeal or to address inconsistent formulations of principle.

The outcome of the appeals was that the appeals and cross-appeals were dismissed.