Washington property tax appeals
Use our Washington appeal guide and county filing facts now. Automated assessment checks are not open here yet, so tell us where you are and we will email you when they open.
Washington values your home every year at 100 percent of market value, and you appeal to your county Board of Equalization. An appeal makes sense when recent comparable sales show your value is too high. It usually will not help if your bill rose only because the tax rate or levies went up.
- Recent comparable sales show your assessed value is above what your home would sell for.
- The assessor's record has an error in your home's size, condition, or features.
- You file on time: by July 1, or within 30 or 60 days of your value notice, whichever is later.
- Your bill went up but your assessed value is fair. A higher bill often comes from levies and the tax rate, not the assessment.
- You have no market evidence. The assessor's value is presumed correct, so you must show it is wrong.
Read the full explanation
In Washington, county assessors value your home every year at 100 percent of its true and fair market value. If you think that value is too high, you appeal to your county's Board of Equalization, not the assessor. The assessor's value is presumed correct, so you need market evidence, such as recent comparable sales, that the value is wrong. You usually file by July 1, or within 30 or 60 days of your value notice depending on the county, whichever is later. An appeal helps when you have real evidence the value is off. It will not help just because your tax bill went up, since a higher bill can come from levies and the tax rate, not your value. This is general information, not tax advice.
Source: Revised Code of Washington 84.40.030 and 84.40.038 · checked 2026-07-16. We're publishing verified county filing facts as each review is completed. Automated assessment checks will follow our rollout schedule.
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