How Oregon Calculates Child Support
Oregon uses the Income Shares model to determine child support obligations. This page explains the guidelines, formula, and key factors.
Model Type
Income Shares
Oregon's Income Shares guideline (OAR 137-050-0700 et seq.) applies a parenting-time credit under OAR 137-050-0730 that reduces a parent's obligation as that parent's share of overnights increases, calculated from the parents' actual or court-ordered overnight schedule rather than a flat custody-type category.
Income Basis & Definitions
gross
Selects the base-support amount from the schedule/table.
Source: OAR 137-050-0700 guideline formulaParent A gross income used by guideline.
Source: Income definition / worksheet income line(s)Parent B gross income used by guideline.
Source: Income definition / worksheet income line(s)Parenting Time Handling
Calculator selects custody model/worksheet (sole/shared/split/joint) and applies corresponding formula.
Source: Custody/worksheet applicability and parenting-time adjustmentParenting time credit is derived from annual overnights per OAR 137-050; compute credit per rule/worksheet.
Source: Parenting time credit / overnightsDeductions & Adjustments
Adjustments/credits for other dependents or court-ordered support for other children (state-specific).
Source: Other children / preexisting support adjustmentIf the guideline adjusts for spousal support (paid/received), capture amount.
Source: Spousal support (alimony/maintenance) adjustmentAdd-Ons & Allocation
Work-related childcare costs added and allocated between parents.
Source: Childcare add-onChild’s health insurance premium share and uninsured/unreimbursed medical allocation.
Source: Medical support (insurance + uninsured medical)Caps, Minimums & Deviations
If guideline table caps at an income level, above-cap support is typically discretionary with findings.
Source: Maximum schedule income / above-cap handlingDeviation allowed for enumerated factors; requires findings (court-determined).
Source: Deviation factors / findings