Washington Child Support Formula
Washington child support still runs through a standard calculation built on the economic table, worksheets, and income rules in chapter 26.19 RCW. This page keeps the formula structure practical instead of pretending the quick estimator replaces the law.
Use This With Other Washington Tools
Support pages should route back into the core Washington calculators and legal explainers.
Learn when the court can move away from the standard support amount.
Follow the filing path when you need to open or respond to a support case.
Start from the broad Washington support overview and route into the right tool.
Economic table first
RCW 26.19.020 still begins Washington support with the economic table and worksheets.
Income rules matter
RCW 26.19.071 remains the current source for how Washington treats income and deductions.
Lower-limit guardrails
RCW 26.19.065 still controls the self-support reserve and presumptive minimum support amount.
Formula checkpoints that matter most
- Use the current WSCSS materials: Washington’s live worksheet set is still the safest formula baseline.
- Start with current monthly income: The standard calculation still depends on up-to-date income rather than recycled annual figures or old estimates.
- Run the economic table and worksheet sequence: Washington continues to use the economic table and worksheets before any deviation analysis begins.
- Check lower-limit rules separately: The self-support reserve and the $50-per-child presumptive minimum can materially affect the final result.
- Treat the estimator like a tool, not the law: The quick estimator is useful, but the statute and worksheets remain the real formula path.