Oregon Child Support Calculator

Oregon uses the income shares model under OAR 137-050 and the Oregon Child Support Guidelines. Both parents' monthly gross incomes are combined to determine a basic child support obligation from the guidelines schedule. That obligation is divided proportionally based on each parent's share of the combined income. Oregon also applies a parenting time credit based on the number of overnights each parent has with the child.

Gross income in Oregon includes income from all sources including wages, salaries, commissions, bonuses, self-employment income, dividends, severance pay, pensions, interest, trust income, annuities, Social Security benefits, unemployment benefits, disability insurance, workers' compensation, and spousal support received. Oregon courts may impute potential income to a parent who is voluntarily unemployed or underemployed.

Oregon's guidelines include a built-in parenting time credit under OAR 137-050-0730. Rather than using fixed day thresholds, Oregon applies a continuous formula based on each parent's average annual overnights with the child: credit % = 1/(1 + e^(-7.14 * ((overnights/365) - 0.5))) - 2.74% + (2 * 2.74% * (overnights/365)). Even a small number of overnights produces a small credit, and the credit grows steadily as overnights increase, reaching roughly 50% at equal (182.5 overnight) parenting. Each parent's credit reduces their share of the basic support obligation, and only the parent with the greater net obligation pays.

Yes, either parent can request a modification of child support when there has been a substantial change in circumstances. Oregon allows modification if the current order differs from the recalculated guideline amount by 15% or more. Common reasons include significant income changes, changes in parenting time, changes in childcare or medical costs, or a child aging out of the order.

In Oregon, child support generally continues until the child turns 18. Support can continue until age 21 if the child is a 'child attending school' who is enrolled at least half-time and making satisfactory progress in an accredited educational program. Support may also continue for a child with a disability. Consult the Oregon guidelines for the specific requirements that apply to your situation.

Yes. Under Oregon's guidelines, work-related childcare costs and the cost of health insurance for the child are added to the basic child support obligation before it is divided between the parents. Each parent's share of these additional costs is proportional to their share of the combined adjusted income. Oregon also protects a self-support reserve ($1,522 per month as of July 2025), so a parent's total obligation cannot exceed the income they have left after that reserve. The guideline scale is capped at $30,000 of combined adjusted monthly income.

This calculator provides an estimate based on the Oregon child support guidelines. Actual court-ordered support may differ because the court may rebut the guideline amount based on factors including the child's special needs, extraordinary expenses, the financial resources of each parent, and the standard of living the child would have enjoyed. Consult an Oregon family law attorney for an accurate assessment.