DEADLINE FROM YOUR NOTICE

Mason County property tax appeals

Your deadline runs from the date on your assessment notice.

Appeals go to Mason County Board of Equalization, then the Washington State Board of Tax Appeals.

Mason CountyFROM YOUR NOTICE
We'll email you when Washington notices go out. Nothing else.
HOW WASHINGTON APPEALS WORK
THE SHORT VERSION

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.

WHEN AN APPEAL MAKES SENSE
  • 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.
WHEN IT USUALLY WILL NOT
  • 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.
ASSESSED AT100% of market valueAPPEAL TOCounty Board of EqualizationDEADLINEJuly 1, or 30–60 days after your noticeSNOHOMISH 2026By August 25
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. In Florida we run the numbers for you. In Washington we give you the deadline, where to file, and the rules, verified against official sources.

MASON COUNTY APPEAL FACTS
Filing window:
File with the county Board of Equalization by July 1, or within 30 days after the assessor mails or electronically sends the value notice. A county may adopt a notice window of up to 60 days. The later date controls, so there is no single countywide 2026 deadline.
Where to file:
Mason County Board of Equalization, then the Washington State Board of Tax Appeals

Verified against official sources, approved 2026-08-07.

See more of Washington or our free Florida checks.