Nathanson v Minister for Home Affairs & Anor

This matter concerns an application for special leave to appeal to the High Court of Australia, brought by the applicant, Mr Nathanson, against the Minister for Home Affairs. The dispute centres on whether a breach of procedural fairness by the Administrative Appeals Tribunal (the Tribunal) was material to its decision. The applicant contends that the Tribunal failed to afford him procedural fairness by relying on allegations of domestic violence in its decision without providing him with adequate notice or an opportunity to respond.

The core legal issue before the High Court is the application of materiality principles to a breach of procedural fairness, specifically where the breach consists of a denial of an opportunity to be heard on critical issues. The applicant argues that the Tribunal, after initially downplaying the relevance of new ministerial directions concerning family violence, ultimately relied on these directions and the alleged domestic violence incidents adversely to him, without affording him a proper chance to make submissions or adduce evidence. A key point of contention is whether the applicant was required to demonstrate specific evidence or submissions that might have altered the outcome, or if the denial of the opportunity itself, in the context of the Tribunal's misleading assurances, established materiality.

The applicant's argument posits that the majority of the Full Court erred in finding the breach of procedural fairness to be immaterial. This error, it is submitted, arose from an impermissible speculative counterfactual analysis, requiring the applicant to identify specific evidence or submissions that might have led to a different result. The applicant contends that in cases involving a denial of an opportunity to be heard, particularly where the applicant was misled about the significance of the issue, materiality should be established by ready inference from the fact of the lost opportunity, unless rebutted by other facts. The applicant draws parallels to cases like *Stead v State Government Insurance Commission* and *Degning*, arguing that the Tribunal's conduct, including its initial reassurances and the late introduction of the domestic violence allegations in a new context, meant the applicant was denied a realistic possibility of influencing the decision.

The respondent, the Minister for Home Affairs, submits that the case involves the application of settled principles to a specific set of facts and does not raise a significant issue of principle warranting the High Court's intervention. The respondent argues that the majority in the Full Court correctly applied the principles established in cases such as *SZMTA* and *MZAPC*, which require a determination of whether there was a realistic possibility that the decision would have been different had the breach not occurred. The respondent contends that the specific features of this case, including the applicant's prior awareness of the domestic violence allegations and his cross-examination on the matter, constrained the scope for reasonable conjecture about what might have been said or done differently, necessitating a specific identification of evidence or submissions that could have altered the outcome.