(1) Subject to section 19, a liability is a registrable maintenance liability if:
(a) it is a liability of:
(i) a parent of a child to pay a periodic amount to a parent or non - parent carer of the child for the maintenance of the child; or
(ii) a step - parent of a child to pay a periodic amount to a parent or non - parent carer of the child for the maintenance of the child; and
(b) either of the following subparagraphs applies:
(i) it arises under a court order or court registered maintenance agreement;
(ii) it is a collection agency maintenance liability.
(2) Subject to section 19, a liability is a registrable maintenance liability if it arises under a child support assessment.