•   Normally, the Registrar cannot make a departure determination under Part   6A, and a court cannot make a departure order under Division   4 of this Part, in respect of a day in a child support period that is more than 18 months earlier.

•   Under this Division, a liable parent, a carer entitled to child support or the Registrar can apply to certain courts for leave for a determination or order to be made in respect of a day in a child support period that is more than 18 months earlier.

•   A court must not grant leave for such a determination or order to be made in respect of a day in a child support period that is more than 7 years earlier.

•   If a court grants leave, the court can decide whether the Registrar should make such a determination or the court should make such an order.