Whittaker v Child Support Registrar

This matter concerned an appeal to the High Court of Australia by Mr Whittaker against a decision of the Full Federal Court. The dispute centred on the interpretation of the *Child Support (Registration and Collection) Act 1988* (Cth) and, specifically, the circumstances under which a child support liability, once registered, could be discharged. Mr Whittaker sought to argue that his liability for child support payments had been discharged by operation of law, a contention that had been rejected by the courts below.

The central legal issue before the High Court was whether the registration of a child support liability under the Act, which had been made by consent of the parties, could be retrospectively discharged by a subsequent court order made under the *Family Law Act 1975* (Cth). The High Court was required to determine the interplay between the statutory scheme for child support registration and collection and the Family Court's power to make orders concerning children, particularly in relation to financial support.

The High Court, in allowing the appeal, held that the registration of a child support liability under the *Child Support (Registration and Collection) Act 1988* creates a statutory debt that is not susceptible to retrospective discharge by a Family Court order made under the *Family Law Act 1975*. Their Honours reasoned that the former Act establishes a self-contained regime for the registration and collection of child support, and that once a liability is registered, it can only be discharged in accordance with the specific provisions of that Act. A Family Court order made under the *Family Law Act 1975*, even if it purports to vary or discharge the child support obligation, cannot operate retrospectively to extinguish a debt that has already been validly registered. The Court emphasised the distinct statutory purposes and mechanisms of the two Acts, concluding that the legislative intent was to provide certainty and enforceability to registered child support liabilities. The High Court ordered that the appeal be allowed and that the matter be remitted to the Federal Circuit and Family Court of Australia for further proceedings consistent with the High Court's judgment.