1.  Written agreement.  A written agreement between the parties providing an alternative arrangement is filed with and approved by the court; or  

2.  Demonstration of good cause.  A party demonstrates and the court finds that there is good cause not to require immediate income withholding. For purposes of this subsection, a finding of good cause by the court must be based on a determination that immediate income withholding would not be in the best interest of the child and a showing by the responsible parent that any previously ordered support was paid timely. The court shall explain the basis for a finding of good cause in the support order.