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King County's assessment ratio means effective tax rates are low — but incorrect appraisals still cost money. Ownwell manages the appeal with no upfront cost.
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Frequently Asked Questions
What is my King County property tax appeal deadline?
The appeal deadline is July 1 of the assessment year or within 60 calendar days after the date on your valuation change notice — whichever is later. Because the Assessor mails notices between May and November, your specific deadline depends on when you received your notice. Look up your exact deadline at eAppeals using your property address or parcel number. File online through eAppeals or by mail to the Board of Equalization. Ownwell can manage the process and only charges if you save.
What is the King County Property Tax Advisor and how do I use it?
The Property Tax Advisor Office is a free service independent of the Assessor and Board of Equalization, operating through the King County Office of the Ombuds. The Advisor helps residential property owners determine whether an appeal is worthwhile, find comparable sales, and understand what evidence the Board considers. Call 206-477-1060. This service is not available in most other counties and is worth contacting before filing any appeal.
Who qualifies for the King County senior property tax exemption?
Homeowners 61 or older with annual household income below $84,000 can apply for the senior exemption. The $84,000 income threshold is significantly higher than most states' senior exemption programs, reaching into the middle-income senior bracket. Apply online through the Assessor's Senior Exemption Portal or call 206-296-3920. The County also offers property tax deferral for qualifying seniors who cannot pay when due.
Does Washington have a state estate tax?
Yes, and it is one of the most important estate planning considerations for King County residents. Washington's state estate tax applies to estates above $2.193 million (2024 threshold), which is significantly lower than the federal threshold of $13.61 million. For King County homeowners with high-value properties in Seattle and Eastside communities, the state estate tax can be a meaningful liability. Nevada, Florida, and many other popular retirement destinations do not have a state estate tax.
How does Washington's community property law affect probate in King County?
Washington is a community property state. Property acquired during marriage is owned equally by both spouses. At death, the surviving spouse automatically retains their half — only the deceased spouse's half is subject to probate. Washington also allows community property agreements that cause all community property to pass to the surviving spouse without any probate at all. This can significantly simplify estate administration for married King County residents.
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