Oregon uses an income shares model with a Basic Child Support Obligation (BCSO) schedule based on combined adjusted income from $800 to $30,000/month. A parenting time credit applies for 25%+ overnights (91+ nights) with a 1.5x multiplier adjustment.
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Oregon calculates child support using the Income shares model with BCSO schedule established under ORS 25.275, OAR 137-050-0700. This is a statutory formula that leaves limited room for judicial discretion on the base calculation amount, ensuring consistency and predictability for families across the state.
Basic obligation from BCSO schedule. Each parent's share = pro rata based on income. Parenting time credit for 91+ overnights.
The calculation begins with determining each parent's net disposable income, which includes virtually all sources of income minus taxes, mandatory payroll deductions, and certain hardship deductions. The court then applies the statutory formula using the time each parent has primary physical responsibility for the children and the applicable income allocation brackets.
Beyond the base formula amount, Oregonrequires additional contributions for mandatory add-on expenses. These typically include childcare costs necessary for the custodial parent's employment or education, uninsured healthcare expenses for the children, and in some cases, educational and travel costs. These add-ons are split between parents in proportion to their respective incomes.
Primary statute: ORS 25.275, OAR 137-050-0700
BCSO schedule: $800–$30,000/month combined adjusted income.
Parenting time credit: 25%+ overnights (91+ nights) with 1.5x multiplier adjustment.
Self-support reserve: approximately $1,100/month.
Presumed minimum: approximately $100/month per child.
Health insurance and childcare allocated proportionally by income share.
Oregon is a pure no-fault state — irreconcilable differences is the sole ground.
No mandatory waiting period — one of few states with no waiting period.
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Residency Requirement
6 months residency (ORS 107.075)
Mandatory Waiting Period
No mandatory waiting period
No-Fault Ground
Irreconcilable differences (pure no-fault — ORS 107.025)
State Income Tax
Progressive 4.75–9.9% (among the highest in the US)
Oregon uses the Income shares model with BCSO schedule under ORS 25.275, OAR 137-050-0700. Oregon uses an income shares model with a Basic Child Support Obligation (BCSO) schedule based on combined adjusted income from $800 to $30,000/month. A parenting time credit applies for 25%+ overnights (91+ nights) with a 1.5x multiplier adjustment.
Key factors include both parents' income, the number of children, custodial time share, mandatory add-on expenses (childcare, health insurance), and any applicable deductions. BCSO schedule: $800–$30,000/month combined adjusted income.
Yes. Either parent can request a modification if there has been a material change in circumstances, such as a significant change in income, custody arrangements, or the needs of the child. The court will recalculate support using the same statutory formula.
Basic obligation from BCSO schedule. Each parent's share = pro rata based on income. Parenting time credit for 91+ overnights.
Get a personalized child support calculation based on Oregon's actual statutory formula.
Start My Free OregonEstimate →This tool provides educational estimates based on Oregon family law and does not constitute legal advice. Child support calculations are approximations of the statutory formula and may differ from court-ordered amounts. Consult a licensed Oregon family law attorney before making decisions. Primary statute: ORS 25.275, OAR 137-050-0700.