Attorney-General (ACT) v Eastman

The Attorney-General for the Australian Capital Territory (ACT) sought leave to appeal out of time against a decision of the Supreme Court of the ACT. The dispute concerned the application of issue estoppel and estoppel by convention in circumstances where findings adverse to the ultimately successful party were made in prior proceedings. The matter was heard by Moore, Stone, and Dowsett JJ of the Federal Court of Australia.

The primary legal issues before the Full Federal Court were whether issue estoppel operated to prevent the Attorney-General from pursuing certain arguments, and whether estoppel by convention applied. Specifically, the court had to determine if findings made in earlier proceedings, which were ancillary to the ultimate result of those proceedings and not essential to the final determination, could nonetheless give rise to an issue estoppel in subsequent litigation. The court also considered the circumstances under which an estoppel by convention might arise.

The Full Federal Court held that issue estoppel does not extend to findings that are not essential to the ultimate decision in prior proceedings. The court reasoned that the jurisdiction of a court is not defined by issue estoppel in such a manner. Furthermore, the court found that the requirements for estoppel by convention were not met in this case. Consequently, the application for leave to appeal was dismissed.

The application for leave to appeal was dismissed with costs.