In most states the parents of a minor child may agree to the amount of child support, and courts encourage the parents to do so. But the court will generally review the agreed amount of child support and determine whether it is in the best interest of the child before signing a child support order. And if the parents later agree to change the amount of or need for child support, they should return to court and get a signed order that reflects the agreed or changed amount, as only the court may change the legal obligation under a child support order.

In North Carolina, parents of a minor child can negotiate and agree upon the amount of child support. The state encourages such agreements as they can be more amicable and tailored to the specific needs of the family. However, any agreement made by the parents must be reviewed and approved by the court to ensure that it meets the child's best interests. The court will compare the agreed amount to the North Carolina Child Support Guidelines to determine if it is appropriate. If parents wish to modify an existing child support order, they must petition the court for a modification. The court will then review the request and decide whether a change in circumstances justifies a modification of the support amount. It is important to note that until the court signs a new order, the original child support order remains in effect and legally binding. Therefore, any informal agreements between parents to change the support amount are not enforceable until a court has approved the change.