Washington Child Support Guidelines (2026 Updates)
Washington's 2026 child support laws are designed to be predictable. This review explains how the state arrives at the support figure for one child at the $2,900 mark, providing clarity for the process in King County.
Breakdown of the $2,900 Calculation
Washington's 2026 schedule provides a specific line item for $2,900 net income. For families with one child, this dictates a $630 base obligation, though King County judges may deviate for cause.
Standard Mid-Income Calculation
Your $2,900 income falls within the standard economic schedule. This means the $630 figure is the presumptive legal standard. Want a complete breakdown including deviations and expenses? Calculate your full worksheet
Presumptive Amount
$630
Schedule Bracket
Standard Limit
The SSR and Low-Income Safeguards
The 2026 Washington schedule incorporates the $2,394 SSR. For a $2,900 income, the $630 obligation is subject to a check to ensure the payor isn't reduced to a net income below the poverty threshold.
Filing in King County Superior Court
In King County Superior Court, located in Seattle, child support orders based on a $2,900 combined income are filed with theKing County Superior Court clerk at 516 3rd Ave, Room E-609, Seattle, WA 98104. Filing fees inKing County are $314. Once filed, the presumptive$630/mo order for one child becomes the baseline unless either parent requests a deviation hearing.
Income Bracket Context
At $2,900/mo, this household falls in the lower income bracket of Washington's 2026 schedule — below the state median of $7,114/mo. At this level, SSR protections and low-income deviations are more likely to influence the final order than the presumptive $630 figure.
Deviation Likelihood in King County
At the $2,900 level, deviation requests are less common but still possible in King County. The most frequent grounds are extraordinary healthcare costs, shared custody arrangements, or documented debts. The presumptive $630 is upheld in the majority of standard cases at this income tier.
Children-Specific Insight
For one child at $2,900/mo, the $630 obligation reflects Washington's base rate. Parents adding a second child to the order would see this figure rise to $966 — an increase of $336 — reflecting the additional resources required under the 2026 schedule.
Related Income Tiers
Parents earning slightly more than $2,900 — at $3,000/mo — would face a presumptive order of $652/mo for one child in Washington. Those earning slightly less at $2,800/mo would owe $609/mo. These neighboring brackets help illustrate how Washington's 2026 schedule scales support incrementally with income.
Application in King County Superior Court
While the 2026 economic schedule is uniform statewide, the King County Superior Court handles procedural enforcement. In King County, judges may require additional proof of income before finalizing the $630 order.
Calculation Summary & Requirements
Determining support for a $2,900 income in Washington is a multi-step process. While the 2026 tables set a $630 baseline for one child, the final order in King County considers deviations and the SSR.
Accuracy & Legal Status
While we strive for accuracy, these figures for $2,900 are for informational purposes. The 2026 guidelines are subject to change, and the King County Superior Court has the final authority on all support amounts.