Oregon Child Support Calculator (2026)
Oregon calculates child support under income-shares guidelines (ORS 25.270–25.290 with OAR 137-050-0700 et seq.). Estimate the guideline amount below.
Income basis: combined monthly gross (adjusted) income.
Enter the income above to see the guideline estimate.
Simplified guideline estimate, interpolated from the official schedule — before health-insurance, childcare, and parenting-time adjustments. For the exact figure use the official Oregon calculator.
Your Case Details
Answer a few questions to see your estimated range.
Approximate gap between higher-earner and lower-earner.
Estimated Monthly Support
$840 — $1,560
State formulas vary significantly. This estimate uses national averages — your state's guidelines may produce a different number.
Editorially Reviewed — Content reviewed for accuracy using published legal research, government data, and verified court records. See our methodology
Reviewed by Leonard Goldberg, Editor · Last updated
Oregon uses the income-shares model: both parents' incomes are combined, the official schedule sets a basic support obligation, and each parent owes their proportional share (ORS 25.270–25.290 with OAR 137-050-0700 et seq.). The calculator above interpolates the official schedule for a quick estimate — health-insurance, child-care, and parenting-time adjustments come on top.
How Oregon Calculates Child Support
Oregon calculates child support under the income-shares model (OAR 137-050-0700 through -0765): both parents' gross incomes are adjusted and combined, the state's Obligation Scale sets a basic support obligation by number of children, and each parent owes their percentage share — modified by a parenting-time credit, child-care costs, and medical support. The Oregon Child Support Program runs an official online calculator that produces a court-ready worksheet.
Statutory basis: ORS 25.270–25.290 with OAR 137-050-0700 et seq.. Exact figure: official Oregon calculator.
Official Schedule — Excerpt
Basic support obligation at selected combined incomes (combined monthly gross (adjusted) income), from the official Oregon schedule:
| Combined income | 1 child | 2 children | 3 children |
|---|---|---|---|
| $3,000 | $558 | $808 | $951 |
| $5,000 | $788 | $1,136 | $1,333 |
| $7,500 | $927 | $1,325 | $1,542 |
| $10,000 | $1,082 | $1,542 | $1,789 |
Worked Example
Two children, Parent A adjusted gross $3,000/month, Parent B $2,000/month, no shared overnights or add-ons. Combined income $5,000 → Obligation Scale amount $1,136 for two children. Parent A's share is 60% × $1,136 ≈ $682/month. Self-support-reserve check: $3,000 − $1,729 reserve = $1,271 available, which exceeds $682, so the full amount stands (subject to the $100 minimum-order floor and rebuttal factors).
When Courts Deviate From the Guideline
- Other available resources of a parent (OAR 137-050-0760(1)(a))
- The reasonable necessities of the parent
- A parent's ability to borrow
- The number and needs of a parent's other dependents
- Extraordinary or diminished needs of the child (excluding extracurricular expenses)
Frequently Asked Questions
What child support model does Oregon use?
Income shares under OAR 137-050: adjusted gross incomes are combined, the Obligation Scale sets the basic obligation, and each parent owes their percentage share, adjusted for parenting time, child care, and medical support.
How does Oregon calculate the parenting time credit?
Not by a simple overnight threshold — OAR 137-050-0730(6) uses a formula (a logistic curve over annual average overnights) that increases the credit continuously from 0% at zero overnights to 100% at equal parenting time; the rule includes a lookup table for hand calculations.
What is Oregon's self-support reserve?
Under OAR 137-050-0745, $1,729/month (effective July 1, 2026) is subtracted from a parent's adjusted income before support is set, so an order cannot push the paying parent below basic subsistence. The figure is the federal poverty guideline for one person × 1.30, reviewed annually.
Is there a minimum child support order in Oregon?
Yes — OAR 137-050-0755 rebuttably presumes at least $100/month in total support, with exceptions for exactly equal overnights, medical-support-only orders, suspended-for-incarceration cases, and parents whose only income is disability or qualifying public benefits.
Can the guideline amount be rebutted?
Yes — OAR 137-050-0760 lists rebuttal factors (other resources, reasonable necessities, ability to borrow, other dependents, extraordinary child needs, tax consequences). The decision-maker must state the presumed amount, the deviated amount, and the reason.