A change requires a formal review or filing
The existing amount remains due until a court or child support administrator changes the order. Oregon’s Child Support Program may review qualifying support terms after 35 months. A parent may request an earlier review with evidence of a significant change, such as changed physical custody or a substantial income change. The agency explains both routes on its modification page (opens in a new tab).
A current calculation should use updated income, parenting time, insurance, child care, and the child’s living arrangement. Court orders, administrative orders, and interstate orders can require different procedures. Filing in the wrong forum can cost time while the existing obligation continues.