In Michigan both parents are responsible for the support of their children and the court will likely order a payment except in the unusual circumstance where both parents have exactly the same income and spend the same amount of time with the children. Michigan has a Child Support Guideline which considers both parent's incomes, the number of children involved, and how much time each parent spends with the children. It also takes into account various custodial arrangements, such as split custody, and shared economic responsibility. Provided the court agrees to it and states what child support should be and the reason for the variance from the support guideline. Michigan has a Child Support Guideline that is periodically updated which takes into account the total available income of each parent.
Child support is calculated based on the income of both parents and the number of children.
If both parents share parenting time with the children for more than 128 days per year, then child support is calculated based on shared economic responsibility which takes into account that each of the parents has a substantial investment in the raising of the children. Anytime there has been a change in circumstances, but generally the Courts will permit a petition every two years. The Friend of the Court will provide you with forms with which to petition the court for more support. The forms are very simple to fill out and have good instructions. Under the Federal Bankruptcy Code, child support obligations and spousal support obligations are exempt from dischargability in bankruptcy.