A court can modify child support when there is a substantial and continuing change in circumstances or when an order lacks required medical support provisions. As a general rule, any modification only affects installments that come due after the motion to modify is filed. The statute also provides specific retroactivity rules for certain changes in physical care. Courts will review updated financial information and apply the current guidelines. The modification standard is designed to keep orders fair as circumstances evolve. The statutory text explains both the grounds and the timing of changes. If you have questions or need to discuss your child support situation, don’t hesitate to reach out to us.