Child Support Registrar & Ahern

In the case of Child Support Registrar v Ahern, the primary issue before the court was the jurisdiction of the Social Security Appeals Tribunal (SSAT) to review and revise a decision made by the Child Support Registrar regarding the calculation of adjusted taxable income for child support purposes. The father had objected to the Registrar's original decision, which was subsequently reviewed by the SSAT. The SSAT's decision to adjust the income figures for a period beyond the scope of the original decision led to an appeal by the father to the Federal Circuit Court, on the basis that the SSAT exceeded its jurisdiction.

The central legal issue was whether the SSAT had the authority to make a departure order for a period not covered by the original decision or the objection decision. The father argued that the SSAT's decision to alter the income figures for a period after the objection period was outside the scope of the review and constituted an entirely new decision. The court had to determine if the SSAT's actions were within the bounds of its powers as outlined in the relevant statutes.

The Federal Circuit Court found in favour of the father, holding that the SSAT did not have the jurisdiction to make a departure order for the period 1 July 2010 to 30 June 2013, as it was not within the scope of the original decision or the objection decision. The court reasoned that the SSAT, while reviewing the Registrar’s decision, overstepped its authority by altering income figures for a period not included in the original or objection decision. This action, according to the court, was not a review but the creation of a new decision, which the SSAT was not empowered to do.

The court's decision resulted in the SSAT's order being set aside, and the case was remitted back to the SSAT for reconsideration within the proper jurisdictional scope. The Federal Circuit Court emphasised that the SSAT must confine its review to the scope of the decision under review, and any departure from this would render the SSAT's decision unlawful.