King County Child Support Rules: 2026 Local Guidelines Explained
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WCSSC Editorial Team
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- LFLR 10 requires comprehensive financial declarations, more detailed than state forms
- Seattle vs. Kent courthouse routing depends on the responding parent's ZIP code
- Tech worker income (RSUs, bonuses, stock options) is treated as gross income
- Seattle daycare often exceeds $2,000/month, this is always split proportionally
- Family court commissioners handle most initial hearings, not judges
Disclaimer: This guide covers King County local family law rules as of 2026. It is educational information, not legal advice. Consult a licensed Washington family law attorney for guidance specific to your case.
If you've read Washington's state child support guidelines and assumed that's all you need to know before walking into a King County courtroom, you're about to be surprised. King County operates under a supplemental set of Local Family Law Rules (LFLR) that add requirements layered on top of state law, and commissioners there enforce them with far less patience for non-compliance than you'd encounter in a smaller county.
| Guideline | 2026 Rule |
|---|---|
| Self Support Reserve | approximately $2,394 |
| Economic Table Limit | $50,000 |
| Minimum Support | $50 per child |
King County also sees a disproportionate number of high-income cases, tech workers at Amazon, Microsoft, and Boeing, professionals with complex compensation packages, and dual-income households where both parents earn well above the state average. These cases present unique calculation challenges that the standard table handles differently here than anywhere else in Washington.
Before diving into the local rules, check your income scenario using our King County child support calculator.
1. LFLR 10: Washington's Most Demanding Financial Disclosure Requirement
Under Local Family Law Rule 10 (LFLR 10), every party in a King County family law case involving children must file a comprehensive Financial Declaration using the state form FL All Family 131, supplemented by King County's specific attachment requirements.
Your financial declaration must be accompanied by:
- Last 2 complete federal tax returns (both W-2s and 1040s)
- Last 3 consecutive pay stubs
- 12 months of bank statements (checking and savings) if self-employed or if income verification is contested
- Brokerage or investment statements if RSUs, dividends, or capital gains are claimed as income
- Any existing child support orders for other children
- Documentation of childcare costs actually paid (invoices or receipts, not estimates)
- Health insurance premium documentation
Commissioners in King County have seen every trick in the book. Submitting a declaration without full documentation, or with numbers that don't reconcile with the supporting documents, is treated as a credibility issue, not just a procedural one. When the court doesn't trust your income disclosure, it imputes income at a much higher level, and you end up worse off than if you'd disclosed everything upfront.
| Compensation Type | King County Treatment |
|---|---|
| RSUs (Tech Workers) | Counted as gross income upon vesting |
| Seattle Daycare | Split proportionally (often $2000+/mo) |
2. Seattle vs. Kent: Knowing Your Courthouse
King County's two family court locations handle different geographic zones, and filing in the wrong one doesn't just cause an inconvenient transfer, it delays your case by weeks.
- King County Courthouse (Seattle): 516 Third Avenue, Seattle, WA 98104. Hours: M–F 8:30 AM–4:30 PM. Phone: (206) 477-0400. Handles North/Central King County ZIP codes.
- Maleng Regional Justice Center (Kent): 401 Fourth Avenue North, Kent, WA 98032. Hours: M–F 8:00 AM–4:30 PM. Phone: (253) 372-7300. Handles South King County ZIP codes.
Routing is based on the responding party's place of residence, usually where the non-moving parent lives. The King County Superior Court website has a ZIP code lookup tool if you're unsure.
3. High-Income Cases: Tech Workers, RSUs, and Bonus Income
King County's family courts routinely deal with tech worker income that doesn't fit neatly into the standard pay stub + W-2 model. Here's how the most common compensation elements are treated:
Restricted Stock Units (RSUs)
RSUs that vest during the calculation period are counted as income in the year they vest, they're reported on your W-2 in box 1 just like wages. If your annual RSU vesting is $60,000, that's $5,000/month added to your gross income. Courts see this on your tax return and will include it unless you can show it was non-recurring.
Annual Bonuses
Year-end bonuses are averaged over 12 months and added to the monthly income calculation. If you received $24,000 in bonuses over the past year, that's $2,000/month additional gross income. Claiming a bonus was "one-time" is difficult unless you provide documentation showing it was project-based and non-repeating.
Income Above $50,000 Combined
When combined monthly net income exceeds $50,000, the standard table ends and judicial discretion kicks in. The court uses the table's top-tier amount as a starting point and may add a percentage of income above that threshold. High-income King County cases with two attorneys often involve significant litigation over exactly what the "lifestyle standard" was during the marriage.
4. Daycare in Seattle: It Changes Everything
Full-time infant and toddler daycare in Seattle regularly costs between $2,000 and $2,800 per month per child, among the highest in the country. This is added to the child support worksheet as a work-related childcare expense and split proportionally between both parents.
If you're the parent with 60% of the combined income and daycare is $2,400/month, your share is $1,440, on top of your base transfer payment. The total obligation can easily reach $2,000+ when daycare is factored in for a Seattle-based case, even at a moderate income level.
This is exactly why worksheets matter so much in King County. The base support number from the economic table is rarely the whole story. Run your full worksheet to see what daycare and healthcare actually do to your total obligation.
5. Commissioners vs. Judges in King County Family Court
Most initial hearings, temporary orders, and uncontested support orders in King County are handled by Court Commissioners, judicial officers with full authority to enter binding orders. A Superior Court judge reviews commissioner decisions only if a party files a Motion for Revision within 10 days.
Commissioners run fast, efficient hearings. They expect you to show up with complete documentation, know your numbers, and be ready to state your position concisely. Showing up with incomplete financial declarations, vague income estimates, or an inability to explain your child support worksheet will result in an unfavorable temporary order that can be very difficult to undo.
Related Articles
- Filing For Child Support in King County: Step-by-Step
- 2026 WA State Guidelines: Complete Handbook
- Full Calculation Walkthrough: Step-by-Step
Conclusion
King County doesn't cut corners on financial disclosure, and neither should you. The most common outcome for parents who walk in underprepared is a temporary order that's either too high or too low, and those temporary orders can take months to correct. Get your documentation together, run your numbers through the Worksheet Wizard, and show up knowing exactly what you owe and why.
Calculate Your Obligations
For official state resources and documentation, please visit the Washington DSHS or the Washington Courts homepage.
Calculate Your Exact Child Support
Free · 2026 RCW 26.19 Guidelines · All 39 Washington Counties
Keep Reading
Related Washington Child Support Guides
Filing for Child Support in King County: A Step-by-Step Guide
2026 Washington State Child Support Guidelines: The Complete Handbook
Understanding the approximately $2,394 Self-Support Reserve (SSR) in 2026
Frequently Asked Questions About Washington Child Support
Generally, no. The statewide economic table is applied uniformly across all 39 Washington counties, King County does not have a separate higher table to reflect Seattle's cost of living. However, the high cost of childcare in Seattle does get factored in as an extraordinary expense, which significantly increases the real total obligation beyond what the base table shows.
Routing is based on the responding party's (non-moving parent's) place of residence, not the petitioner's. If the responding parent lives in Renton, that's typically the Seattle courthouse. If they're in Auburn or Federal Way, that's typically the Kent courthouse. When in doubt, call the clerk at (206) 477-0400 before filing.
The commissioner can impute your income at whatever rate they find reasonable, often significantly higher than your actual income, and enter a temporary order based on that imputed amount. Getting that order revised requires a subsequent hearing, which takes time. In King County, failing to properly disclose income often results in worse outcomes than full disclosure would have.
Calculate Your Exact Child Support
Get an immediate estimate based on the 2026 Washington State Economic Tables. Our tool accounts for the expanded $50,000 threshold and the approximately $2,394 Self-Support Reserve.
Calculate Your Child SupportWCSSC Editorial & Legal Team
Our calculations and guides are rigorously audited by family law advocates and technical developers to ensure compliance with RCW 26.19 and the latest 2026 economic table updates. We maintain a strict editorial protocol based on official AOC mandatory forms and WAC guidelines.
Transparency Disclosure: WCSSC is an independent resource center. We are not a government agency or a law firm. Our calculations are provided for educational and estimation purposes based on the latest 2026 guidelines.
All WCSSC insights are reviewed for compliance with RCW 26.19.065 and official Washington State guidelines. Our team cross-references all data with official AOC publications.