Sidhu v Van Dyke

The High Court of Australia, constituted by French CJ and Bell J, considered the appeal in *Sidhu v Van Dyke*. The dispute concerned a claim for equitable compensation arising from an alleged breach of fiduciary duty by the appellant, Mr. Sidhu, a solicitor, to his client, the respondent, Ms. Van Dyke. Ms. Van Dyke alleged that Mr. Sidhu had acted in breach of his fiduciary duties by failing to disclose his personal interest in a property transaction that was central to her legal advice.

The primary legal issue before the High Court was whether Ms. Van Dyke had established a sufficient causal link between Mr. Sidhu's alleged breach of fiduciary duty and the loss she claimed to have suffered. Specifically, the Court had to determine the appropriate test for causation in claims for equitable compensation for breach of fiduciary duty, and whether the established facts met that test. This involved considering whether the loss was a consequence of the breach, irrespective of whether the client would have entered into the transaction anyway had the breach not occurred.

The Court held that the test for causation in equitable compensation claims requires the plaintiff to demonstrate that the breach of fiduciary duty was a necessary condition of the loss. This means the loss would not have occurred "but for" the breach. The Court found that Ms. Van Dyke had failed to establish this causal connection. While Mr. Sidhu had breached his fiduciary duty by failing to disclose his interest, the evidence did not demonstrate that Ms. Van Dyke would not have proceeded with the transaction had she been fully informed. Her decision to proceed was based on her own assessment of the commercial realities, independent of the undisclosed interest.

Consequently, the High Court allowed the appeal, setting aside the orders of the lower courts that had awarded equitable compensation to Ms. Van Dyke.