Commonwealth Consolidated Acts Commonwealth Consolidated ActsThe annual rate of child support that would, apart from this section, be payable for a child or children in a child support case, for a day in a child support period, by one parent to the other parent is to be reduced (but not below nil) by the annual rate of child support that would, apart from this section, be payable to that parent in relation to that day by the other parent for the child or the children in the child support case.