How to Appeal Your Property Tax in Washington
Washington homeowners can appeal their property tax assessment if they believe it's too high. This guide covers the 2026 appeal deadline, required evidence, and step-by-step process.
2026 Appeal Deadline: July 1 most counties
Don't miss your window. Missing the deadline means waiting another full year.
How Washington Assesses Property
Washington assesses residential property at 100% of market value.
Washington assesses property at 100% of true and fair value (market value).
The Appeal Process
Appeals are heard by the County Board of Equalization. An informal review is available before filing a formal appeal.
County Assessor (Informal)
County Board of Equalization
State Board of Tax Appeals
Superior Court
Washington Appeal Deadline
What Overassessment Costs Washington Homeowners
The median home in Washington is worth $476,000. If your assessment is just 10% too high, you may be overpaying:
~$400/year
Effective tax rate: 0.84% · Median value: $476,000
Check Your Washington Assessment
Enter your address to see your estimated overassessment and Washington filing deadline.
Washington Counties
Clark County
Median: $483,900 · Rate: 0.92%
Deadline: July 1 of the assessment year or 60 days from Notice of Value mailing date
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King County
Median: $885,200 · Rate: 0.82%
Deadline: July 1 of the assessment year or within 60 days of the valuation notice mailing date, whichever is later
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Pierce County
Median: $465,900 · Rate: 1.02%
Deadline: July 1 of the current assessment year, or within 60 days of the date of mailing of a value change notice or other determination notice, whichever is later
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Snohomish County
Median: $668,100 · Rate: 0.89%
Deadline: July 1st or within 60 days of when the change of value notice was mailed, whichever is later
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Guides & Resources
- What Evidence Do I Need for a Property Tax Appeal? (2026)
- Is It Worth It to Appeal Property Taxes? (2026 Analysis)
- Senior Property Tax Exemptions by State: The Complete 2026 Guide
- Best Property Tax Appeal Services in 2026: Pricing, Coverage, and What to Know
- How Much Does Ownwell Cost? Pricing Breakdown & Comparison (2026)
- What Is the Best Evidence to Protest Property Taxes? Expert Guide (2026)
- When Should I File My Property Tax Appeal? Critical Deadlines by State (2026)
- How to Appeal Property Taxes in Washington: Complete 2026 Guide
Property Tax Appeal Resources
Best Appeal Services Compared
7 companies compared — pricing, coverage, and pros/cons for 2026.
2026 Appeal Deadlines
Every state's deadline, filing method, and what happens if you miss it.
Assessment Ratios by State
Every state's assessment percentage — from 4% to 100% — with worked examples.
9 Ways to Lower Your Property Taxes
From homestead exemptions to formal appeals — every method that works.
Savings Calculator
Check if you're overassessed — enter your assessed value to see potential savings.