In most cases, child support payments are calculated based on both parents’ total annual income, taking into consideration how many children need to be supported. Then, a percentage of the parents’ net income is allocated for child support. The percentage starts at 17% for one child, up to at least 35% for five or more children. If the parents’ total net income falls above the threshold used to calculate most child support payments, the court may determine higher amounts if they decide that doing so would be in the best interest of the child.