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 Indiana, as in most states, parents of a minor child can negotiate and agree upon the amount of child support. Indiana courts encourage such agreements as they often serve the best interests of the child by reducing conflict and providing a framework for the parents to cooperate. However, any agreement on child support must be reviewed and approved by the court to ensure that it meets the child's needs and complies with state guidelines. The court will consider the Indiana Child Support Guidelines, which take into account both parents' incomes, the needs of the child, and other relevant factors. 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 determine if there has been a substantial change in circumstances that justifies a change in the support amount. Only a court order can legally alter the obligations set forth in an original child support order.