How to Modify Child Support in Oregon: Filing Steps and Effective Date
To modify Oregon child support, file a motion in court or with the Division of Child Support and serve the other parties. A change can reach back only to service, so serve promptly and keep paying until the order changes.
How do you modify child support in Oregon?
- Run the guideline amount in the Oregon child support calculator and test it in the modification calculator.
- File a motion in the court that has your judgment (ORS 107.135) or, if the Division of Child Support provides services, a written motion in the agency’s form that sets out the reasons (ORS 25.527).
- Serve the other parties. Service under 25.527 follows the notice rules; a court motion uses service under ORCP 7.
- Show the change or the three-year ground; you have the burden (25.527(9)).
- Keep paying the existing order: a motion does not stay enforcement (25.527(7)).
What happens after service on the Oregon agency route?
The other parties have 30 days to settle by stipulation or serve a written objection and request for a hearing. If the moving party is not the administrator and no objection arrives, the moving party can submit the motion to the administrative law judge, who issues the order granting the relief sought; if the administrator moves and no objection arrives, it may enter the order (25.527(4)-(6)).
Why does service matter?
Because a modification can be retroactive only to the date the motion was served or later (107.135(6)), and the court may not modify payments accrued before service (107.135(7)). A change in January and service in July leaves six months at the old amount.
Do I need an Oregon certificate about other support cases?
Yes. The moving party must state whether a support proceeding is pending anywhere and whether another support order exists for the children, and include a certificate on the form the court or agency requires (107.135(2); 25.527(2)-(3)).
What if support rights were assigned to the state?
A true copy of the motion must be served on the Administrator of the Division of Child Support or the local branch office (107.135(9)). Tell the clerk if you or the other parent receives or received public assistance.
Can I get an Oregon credit for time the child lived with me?
The court may allow a credit against child support arrearages for periods, excluding reasonable parenting time, when the obligor, with the obligee’s knowledge and consent or under a court order, had physical custody of the child, and a dollar-for-dollar credit for Social Security or veterans’ benefits paid retroactively to the child (107.135(7)(a)-(b)).
Do I have to use the agency’s form?
For a motion under the child support services provisions, the motion must be in writing in a form prescribed by the administrator, set out the reasons for modification and state your address (ORS 25.527(1)). Ask the agency for the form.
How much does a late motion cost? An example
If you serve 3, 6 or 9 months after your change, the relief you lose at a $300 monthly difference is:
| Delay before service | Relief lost |
|---|---|
| 3 months | $900 |
| 6 months | $1,800 |
| 9 months | $2,700 |
What happens to unpaid support while the motion is pending?
It stays owed. See whether Oregon arrears expire or can be forgiven and add up your balance.
Frequently asked questions
How do I modify child support in Oregon?
File a motion in court, or a written motion with the Division of Child Support if it provides services, and serve the other parties.
How long does the other parent have to respond to an Oregon agency modification motion?
Thirty days to settle or serve a written objection and request a hearing.
What is the effective date of an Oregon modification?
The date the motion was served or any later date.
Do I need a certificate for an Oregon support motion?
Yes, about any pending support proceeding and any other existing support order.
Does an Oregon modification stop income withholding?
Not until the new order is entered.
Official sources
- ORS 107.135: modification of judgments
- ORS 25.287 and 25.527: modification proceedings
- OAR 137-055-3430: substantial change modification
- Oregon DOJ child support bench book
- 42 U.S.C. 666(a)(9): no retroactive modification of support already due
A local family law attorney can review your situation — many offer a free consultation.
This is general information, not legal advice. It is based on the cited Oregon statutes, rules and court opinions, and every case turns on its own facts. Confirm how the law applies to your situation with a licensed Oregon attorney.