How to Modify Child Support in Oregon
Reviewed by DocDraft Legal Team · Oregon · Last updated September 21, 2026
In Oregon, a child support modification is a court or agency order changing the amount of an existing child support order after a substantial change in circumstances, up or down. What sets Oregon apart is that a change reaches back only to the date the other parent is served with your motion, not the date you file, and the state runs a no-cost administrative review through the Oregon Child Support Program. A circuit court may reconsider support when there is a substantial change in economic circumstances of a party (ORS 107.135(3)(a)). You have two routes. You can file a motion to modify in the circuit court that issued your order, or you can ask the Oregon Child Support Program (the DOJ Division of Child Support) to review it (ORS 25.287). The agency uses a substantial compliance test: an order is out of compliance when the difference between it and the current guideline amount is more than 50 dollars or 15 percent, whichever is less (OAR 137-055-3430). Because a change reaches back only to the date of service, support that already came due cannot be reduced, and the judgment is final as to installments accrued before service (ORS 107.135(6),(7)). You can also ask for a review about every three years under federal rules. Keep paying your current order until it is officially changed. Attorney review of your filing is available through DocDraft.
Find out where you stand in Oregon
Where are you with changing your child support order?
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How do I modify child support in Oregon?
File a motion to modify in the circuit court that issued your order, or ask the Oregon Child Support Program to review it. A court may change support when there is a substantial change in economic circumstances of a party (ORS 107.135). Keep paying your current order until it is changed.
How much does the child support amount have to change to modify in Oregon?
For a court motion, Oregon requires a substantial change in economic circumstances, with no fixed percentage (ORS 107.135). Through the Oregon Child Support Program, an order is out of substantial compliance when it differs from the current guideline amount by more than 50 dollars or 15 percent, whichever is less (OAR 137-055-3430).
How far back can a child support change go in Oregon?
A modification takes effect only back to the date the other parent is served with your motion, or a later date, not to when your circumstances changed (ORS 107.135(6)). Support that already came due before service is final and cannot be reduced (ORS 107.135(7)). File and serve promptly to protect yourself.
Which court handles child support modifications in Oregon?
The circuit court in the county where your existing order is filed handles court modifications, usually through its family law docket. If the Oregon Child Support Program manages your case, you can instead ask it to review and adjust the order administratively, without a full court hearing. Both routes apply the state guideline.
Oregon child support modification at a glance
In Oregon, a child support modification is a court or agency changing an existing support order after a substantial change in circumstances, up or down. A circuit court may reconsider support when there is a substantial change in economic circumstances of a party (ORS 107.135(3)(a)). You can file a motion to modify in the circuit court that issued your order, or ask the Oregon Child Support Program (the DOJ Division of Child Support) to review it. The agency uses a substantial compliance test: an order is out of compliance when it differs from the current guideline amount by more than 50 dollars or 15 percent, whichever is less (OAR 137-055-3430). A change reaches back only to the date the other parent is served, so support that already came due cannot be reduced (ORS 107.135(6),(7)).
Lowering an Oregon order after a pay cut
Suppose you have an Oregon order set two years ago and your hours were just cut, and because a modification reaches back only to the date the other parent is served, you act quickly. You complete a motion to modify support with a declaration showing your lower income and file it in the circuit court that issued your order, then have the other parent served the same week (ORS 107.135(6)). You keep paying the current amount while the motion is pending, since support that already came due cannot be reduced (ORS 107.135(7)). At the hearing the court finds a substantial change in economic circumstances and signs a lower order effective back to the service date. Attorney review of your filing is available through DocDraft.
Relevant Laws
ORS 107.135 (modification and effective date of a support order)
Provides that a substantial change in economic circumstances of a party is sufficient for the court to reconsider its order of support, and that a modification may be ordered effective retroactive only to the date the motion for modification was served or a later date, with accrued installments final.
ORS 25.287 (administrative review and modification)
Authorizes the Oregon Child Support Program (the DOJ Division of Child Support) to review and modify a child support order administratively, the no-cost path parents can use when the program manages their case.
OAR 137-055-3430 (substantial change in circumstance)
Defines substantial compliance for a support order review: the difference between the existing order and the amount calculated using current guidelines is not greater than 50 dollars or 15 percent of the current guideline amount, whichever is less.
Oregon Child Support Program: modify an existing support order
The Oregon Department of Justice Child Support Program explains how to request a review or modification of an existing child support order and where to find the request and financial forms.
Regional Variances
Oregon child support modification rules at a glance
Qualifying threshold
For a court motion, Oregon requires a substantial change in economic circumstances of a party, with no fixed percentage (ORS 107.135(3)(a)). Through the Oregon Child Support Program, an order is out of substantial compliance when it differs from the current guideline amount by more than 50 dollars or 15 percent, whichever is less (OAR 137-055-3430).
Where to file
The circuit court in the county that issued your existing order, usually its family law docket. If the Oregon Child Support Program manages your case, you can instead ask it to review and adjust the order administratively (ORS 25.287).
Modification form
For the court route, a motion to modify support with a supporting declaration, using the Oregon Judicial Department family law forms provided at no charge. For the agency route, a request for review through the Oregon Child Support Program.
Retroactivity
A modification can be effective only back to the date the other parent is served with the motion, or a later date (ORS 107.135(6)). Support that had accrued before service is final and cannot be modified (ORS 107.135(7)).
Periodic review
If the Oregon Child Support Program handles your case, you can generally request a review about every three years without showing a change, and sooner when a substantial change in circumstances occurs.
Suggested Compliance Checklist
Gather proof of your changed circumstances
Before you file days after startingCollect current pay stubs, tax returns, and proof of the change (a job loss, income change, or a new parenting schedule), and estimate the new guideline amount to see if a court or the agency would treat your order as out of compliance. Attorney review of your filing is available through DocDraft.
Complete your motion to modify support
As soon as your circumstances change days after startingFill out a motion to modify support and a supporting declaration describing the substantial change in economic circumstances, using the free Oregon Judicial Department family law forms and instructions (ORS 107.135(3)(a)).
File in the circuit court and pay or waive the fee
Promptly (the change dates back to service) days after startingFile your motion with the clerk of the circuit court that issued your order and pay the family law motion fee, or ask the court to waive or defer it if you cannot afford it. File promptly so you can serve the other parent quickly.
Serve the other parent promptly
Right after filing days after startingHave the other parent served with your filed motion, then file proof of service. A modification reaches back only to the date of service, so serving promptly protects the arrears you might otherwise keep paying (ORS 107.135(6)).
Consider an Oregon Child Support Program review
Anytime your case is with the program days after startingIf the Oregon Child Support Program manages your case, ask it to review your order. It treats an order as out of substantial compliance when it differs from the current guideline amount by more than 50 dollars or 15 percent, whichever is less (OAR 137-055-3430).
Attend the hearing and get the new order
On your hearing date days after startingGo to the hearing or complete the agency review with your income proof, let the court or program recalculate support under the guideline, and get the new order effective back to the date of service. Keep paying your current order until then.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Gather proof of your changed circumstances | Collect current pay stubs, tax returns, and proof of the change (a job loss, income change, or a new parenting schedule), and estimate the new guideline amount to see if a court or the agency would treat your order as out of compliance. Attorney review of your filing is available through DocDraft. | - | Before you file |
| Complete your motion to modify support | Fill out a motion to modify support and a supporting declaration describing the substantial change in economic circumstances, using the free Oregon Judicial Department family law forms and instructions (ORS 107.135(3)(a)). | - | As soon as your circumstances change |
| File in the circuit court and pay or waive the fee | File your motion with the clerk of the circuit court that issued your order and pay the family law motion fee, or ask the court to waive or defer it if you cannot afford it. File promptly so you can serve the other parent quickly. | - | Promptly (the change dates back to service) |
| Serve the other parent promptly | Have the other parent served with your filed motion, then file proof of service. A modification reaches back only to the date of service, so serving promptly protects the arrears you might otherwise keep paying (ORS 107.135(6)). | - | Right after filing |
| Consider an Oregon Child Support Program review | If the Oregon Child Support Program manages your case, ask it to review your order. It treats an order as out of substantial compliance when it differs from the current guideline amount by more than 50 dollars or 15 percent, whichever is less (OAR 137-055-3430). | - | Anytime your case is with the program |
| Attend the hearing and get the new order | Go to the hearing or complete the agency review with your income proof, let the court or program recalculate support under the guideline, and get the new order effective back to the date of service. Keep paying your current order until then. | - | On your hearing date |
Frequently Asked Questions
A real, involuntary income drop can be a substantial change in economic circumstances, but you must file a motion or request an agency review to change the amount; support keeps accruing at the old rate until it is changed (ORS 107.135). A court may weigh whether you are earning what you reasonably could. Do not simply stop paying.
No. Either parent can file a motion to modify in the circuit court, or ask the Oregon Child Support Program to review the order, without the other parent's consent. The other parent is served and can respond. If both parents agree on a new amount, they can submit a stipulated order for the court to approve.
A court motion depends on the circuit court's docket and can take several weeks to a few months to reach a hearing. An administrative review through the Oregon Child Support Program also generally takes a few months. Because a change dates back only to the date of service, serving promptly protects you rather than waiting (ORS 107.135(6)).
Yes. If the program manages your case, you can ask it to review and adjust your order administratively (ORS 25.287). It compares your order to the current guideline and treats it as out of substantial compliance when the difference is more than 50 dollars or 15 percent, whichever is less (OAR 137-055-3430).
You can ask for a modification whenever a substantial change in economic circumstances occurs (ORS 107.135). If the Oregon Child Support Program handles your case, you can also generally request a review about every three years even without a change, under federal rules. There is no limit on filing when circumstances genuinely change.
A modification changes support only from the date of service forward (ORS 107.135(6)). Support that already came due, called arrears, is final and cannot be reduced or erased by a modification (ORS 107.135(7)), and it continues to accrue interest. Keep paying your current order to avoid building arrears while your request is pending.
Filing a motion to modify in circuit court carries the standard family law motion fee, but you can ask the court to waive or defer it if you cannot afford it. Requesting a review through the Oregon Child Support Program does not charge you a filing fee. Check current amounts with the circuit court clerk.
For a court motion, the Oregon Judicial Department and your local circuit court provide family law forms and instructions for modifying support at no charge. For the administrative route, the Oregon Child Support Program provides a request for review through the Oregon Department of Justice. Use the official state forms rather than third-party versions.
Other Oregon guides
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