Aou21 v Minister for Home Affairs (No 2)

In the matter of Aou21 v Minister for Home Affairs (No 2), the High Court addressed the issue of costs arising from two related proceedings concerning the applicant's immigration status and detention. The first proceeding was an appeal from the Federal Circuit Court, while the second was an original jurisdiction proceeding seeking declaratory and other relief. Both proceedings substantially concerned the same underlying issues. The applicant, AOU21, successfully argued that the preconditions in section 198AH(1A) of the Migration Act 1958 (Cth) were met and that he should be removed to a regional processing country as soon as reasonably practicable. However, AOU21 failed to establish his other claims for relief, such as release from detention or declarations that his detention was unlawful.

The court had to determine the appropriate apportionment of costs between the parties in light of AOU21's partial success and the interrelated nature of the two proceedings. The court noted that while AOU21 substantially succeeded in the original jurisdiction proceeding, his failure on other claims should reduce the costs order in his favour by 20%. Regarding the appeal, the court found that the appeal was effectively rendered redundant by the outcome of the original proceeding. Despite the formal dismissal of the appeal, the court considered it appropriate not to order costs for the appeal, given the substantial success in the original jurisdiction proceeding and the interrelation between the two cases. The court also upheld a previous costs order made by Griffiths J, which required AOU21 to pay the respondent's costs due to amendments to his notice of appeal.

The High Court's decision reflects a nuanced approach to costs in complex cases involving multiple proceedings with overlapping issues. The court balanced the applicant's partial success in the original jurisdiction proceeding against his failure on other claims, resulting in a reduced costs order. The court's decision also considered the unusual circumstances of the appeal, ultimately deciding not to impose costs on the appeal due to its redundancy and the interrelation with the original proceeding. The final orders directed that the respondents pay 80% of the applicant’s costs, as agreed or taxed, and that the costs order related to the amendments to the notice of appeal remain undisturbed.