(1) A registered maintenance liability first becomes enforceable under this Act on whichever of the following days is applicable in relation to the liability:
(a) if the liability is a transferred maintenance liability--the day on which the liability is transferred to the Child Support Register;
(b) if the liability is registered under subsection 24(1)--the day on which the liability arose under, or was varied or otherwise affected by, the court order or maintenance agreement by virtue of which the liability is registered under that subsection;
(baa) if the liability is registered under subsection 24(2)--such day as is determined, in writing, by the Registrar (being a day not earlier than the day on which the liability arose under, or was varied or otherwise affected by, the court order or maintenance agreement by virtue of which the liability is registered under that subsection);
(ba) if the liability arose under a child support assessment and is registered under subsection 24A(1)--the day on and from which child support is payable under the assessment;
(c) if the liability is registered under subsection 25(2)--such day as is determined, in writing, by the Registrar (being a day not later than 60 days after the day on which the Registrar receives, under subsection 25(1), the relevant duly completed form from the payee of the liability);
(d) if the liability is of a kind mentioned in subsection 18A(1), (2) or (3)--the day on which the Registrar receives the application for the liability to be registered under this Act;
(e) if the liability is an amount in arrears under a liability mentioned in subsection 18A(1) or (2) or paragraph 18A(3)(a)--the day on which the Registrar received the application for registration under this Act of the liability to which the arrears relate.
(2) If the Registrar registers a liability referred to in
paragraph (1)(e), this Act has effect as if the amounts in arrears were
payable under the liability in relation to the child support enforcement
period that began on the day on which the liability first became enforceable
under this Act as a result of the operation of that paragraph.