The child support guidelines generally assume that one party is paying the “controlled expenses” for the child if a party is receiving support. Controlled expenses means that one parent is responsible for paying a certain amount of uninsured medical expenses every year before the other parent has to contribute.
Controlled expenses also means that one parent is responsible for providing essentially all of the clothes, school registration book fees, and school lunches for the children even if the parties are having equal parenting time. In the case of essentially equal parenting time, either party could agree to be responsible for controlled expenses. The child support would be lower for the person who's paying the controlled expenses.