Commonwealth Consolidated Acts Commonwealth Consolidated ActsThe Registrar must not make a determination under this Part that varies, or that has the effect of varying, the annual rate of child support payable, for a day in a child support period, by a liable parent for all of the children in the child support case that relates to the child in respect of whom the determination is made to a rate below the minimum annual rate of child support for the child support period, unless the liable parent has at least regular care of at least one of the children in that child support case.