Washington Child Support Guidelines

Washington operates under the Income Shares model, one of 42 U.S. states using this framework. For a parent supporting one child, the base guideline applies roughly 13% of income, scaling to 19% for two children and 24% for three. That places Washington at rank #51 of 51 states by single-child base percentage. Unlike capped states, there is no statutory income ceiling — the formula applies to the full reported income before deductions. Median household income across Washington is $82,400 annually, which shapes the real-world dollar obligations families face under these percentages.

On the enforcement side, the Washington child support program manages 310,000 active cases and collected approximately $780 million in the most recent OCSE reporting year. The state's collection rate of 64.6% compares to a national average of 60.6% across reporting states — placing Washington at rank #12 of 51 on collection efficiency, and rank #15 by caseload volume (national average: 285,686 cases per state). Paternity is established in 96.3% of Washington cases, compared to 94.9% nationally — a critical step because child support orders cannot be enforced without legal parentage on record. Orders are in place for 80.5% of the caseload.

Context matters when interpreting these numbers. A higher percentage-of-income figure does not automatically mean higher dollar obligations — the underlying income brackets, deductions, parenting-time adjustments, and self-support reserves vary meaningfully between states. Washington allows a parenting time adjustment, which can materially reduce the base obligation when the non-custodial parent exercises substantial overnight time. Use the official Washington calculator linked below for a binding estimate. Data sources: OCSE FY2022 Annual Report, Washington Revised Statutes, and Census ACS 2022.