Washington Judicial Jurisdiction (WA)

Washington Child Support Calculator

Estimate child support under RCW 26.19 (Washington State Child Support Schedule). Calculate baseline support, parenting time overnights, health insurance credits, and work-related childcare costs.

Legal Model: Income Shares Model
Updated for 2026 Guidelines

1. Enter Case Information

WA Rules
$ /mo
Gross or net monthly earnings before deductions
$ /mo
Included in combined guideline income
nights/yr
365 nights per year total (182.5 = 50/50 equal custody)
Common Schedule Presets:
$ /mo
Incremental monthly premium to cover the children
$ /mo
Monthly out-of-pocket work-related daycare costs
Children from prior or subsequent relationships not part of this order

Estimated Child Support

WA Estimate
Total Estimated Obligation
$0
per month
Important Notice: This figure is a computational estimate based on RCW 26.19 (Washington State Child Support Schedule). Final child support orders may deviate based on judicial discretion, extraordinary expenses, or tax adjustments.
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Understanding Washington Child Support Guidelines

Washington State calculates child support using the Income Shares model under RCW 26.19. Net monthly income is determined using statutory tax calculation charts, with separate age tables (0–11 and 12–18).

Shared Custody & Overnights in Washington

Under RCW 26.19.075, a residential credit for shared parenting time is a discretionary deviation, requiring proof of expenses and that the deviation does not leave the child underhoused.

Calculate Your Exact Overnights →

Official Court Worksheets & Forms

Family court filings in Washington require completing: Washington State Child Support Worksheets (WSCSS-Worksheets). Review official forms before filing.

View State Worksheets Directory →

Worked Calculation Example: Standard Washington Scenario

Here is a realistic line-by-line computation for two parents in Washington raising 2 children:

Guideline Worksheet Line Item Parent A (Paying) Parent B (Receiving) Combined / Order Total
Monthly Guideline Income $5800 $4100 $9900
Parental Income Proportion 59% 41% 100%
Basic Child Support Schedule Obligation - - $1620 /mo
Work-Related Childcare Cost - - +$460 /mo
Health & Dental Insurance Premium - - +$230 /mo
Total Combined Child Financial Needs - - $2310 /mo
Final Estimated Monthly Support Order Paid by Parent A to Parent B $1270 /month

Frequently Asked Questions in Washington

Key legal questions regarding child support establishment, modifications, and enforcement in Washington.

How does Washington distinguish child age brackets? +

Washington's economic tables have two age columns: children aged 0–11 and teenagers aged 12–18, providing higher support allocations for teenagers.

Is the residential credit automatic in Washington? +

No. In Washington State, residential credit for shared parenting time is a discretionary deviation under RCW 26.19.075, not an automatic mathematical right.

What is Washington's Self-Support Reserve? +

Washington protects low-income obligors with a Self-Support Reserve set at 125% of the federal poverty level for a single individual.

Next Useful Steps for Your Case

Take the next step in preparing your family financial documentation:

Convert Irregular Income

Standardize hourly wages, seasonal overtime, or commissions into monthly gross figures.

Launch Income Tool →

Explore 50/50 Custody

See how equal time sharing and reciprocal guidelines impact final transfer payments.

50/50 Custody Tool →

Download Official Worksheets

Find the exact PDF court forms and financial affidavits required by your court clerk.

Court Worksheets Directory →