(1) Work out a parent's multi - case cap for a child (the particular child ) for a day in a child support period in accordance with subsection (2) if:
(a) the parent's annual rate of child support for the particular child is assessed for the day under section 37, 38, 39 or 40; and
(b) if section 37 or 38 applies--the parent has a positive child support percentage for the particular child under step 6 of the method statement in section 35; and
(c) in any case--the parent is assessed for the day in respect of the costs of another child who is in another child support case.
(2) The parent's multi - case cap for the particular child for the day is worked out using the formula:
(3) For the purposes of paragraph (1)(c), a parent is taken to be assessed for a day in respect of the costs of another child who is in another child support case if the parent is liable to pay child support for that child for the day under an administrative assessment under the law of a reciprocating jurisdiction.