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Washington

Washington property tax appeals, 2027

In Washington, you appeal a property assessment to the County Board of Equalization, and the deadline is July 1 or 30 days after the Change of Value Notice is mailed, whichever is later (60 days in some counties, such as King). Each county below lists its own date, how to file and who hears the appeal. Sale prices are public record here, so recent sales of similar homes are the main evidence of market value.

Statewide deadline1 Jul 2027· 254 days leftData as of 20 Oct 2026 · 39 counties, state and county records
Rules

How appeals work in Washington

Washington property tax appeal rules for homes
RuleWhat applies
What you argueMarket value as of January 1 of the assessment year (RCW 84.40.020); sales are adjusted to January 1 and must be within 5 years (WAC 458-14-087)
How homes are assessed100% of market value
DeadlineLater of July 1 of the assessment year or 30 days after the Change of Value Notice was mailed; up to 60 days where the county adopts it, e.g. King (RCW 84.40.038).
First appeal toCounty Board of Equalization
What the notice showsMarket value as “True and Fair Value”; assessed value as “Assessed Value”. Mails: Rolling through the year by county and area; not between January 15 and February 15 (RCW 84.40.045)
Sale prices publicYes
StatutesGrounds: RCW 84.40.030, RCW 84.40.0301. Filing: RCW 84.40.038. Assessor’s evidence: RCW 84.48.150.
Data as of 20 Oct 2026 · Washington statutes and revenue department

More: how to read your notice · what a ratio is · evidence that works · deadlines in every state

Counties

Every Washington county

Washington counties by population; 39 in all
CountyDeadlineAppeal rateLoweredCoverage
King County1 Jul 2027——Scan from recent sales
Pierce County1 Jul 2027——Scan from recent sales
Snohomish County1 Jul 2027——Scan from recent sales
Spokane County1 Jul 2027——Scan from recent sales
Clark County1 Jul 2027——Scan from recent sales
Thurston County1 Jul 2027——Scan from recent sales
Kitsap County1 Jul 2027——Scan from recent sales
Yakima County1 Jul 2027——Scan from recent sales
Whatcom County1 Jul 2027——Scan from recent sales
Benton County1 Jul 2027——Scan from recent sales
Skagit County1 Jul 2027——Scan from recent sales
Cowlitz County1 Jul 2027——Scan from recent sales
Grant CountyNot yet published——Scan from recent sales
Franklin County1 Jul 2027——Scan from recent sales
Lewis County1 Jul 2027——Scan from recent sales
Island County1 Jul 2027——Scan from recent sales
Chelan County1 Jul 2027——Scan from recent sales
Clallam CountyNot yet published——Scan from recent sales
Grays Harbor CountyNot yet published——Scan from recent sales
Mason County1 Jul 2027——Scan from recent sales
Walla Walla County1 Jul 2027——Scan from recent sales
Stevens County1 Jul 2027——Scan from recent sales
Whitman County1 Jul 2027——Scan from recent sales
Kittitas County1 Jul 2027——Scan from recent sales
Douglas CountyNot yet published——Scan from recent sales
Okanogan County1 Jul 2027——Scan from recent sales
Jefferson County1 Jul 2027——Scan from recent sales
Pacific County1 Jul 2027——Scan from recent sales
Klickitat County1 Jul 2027——Scan from recent sales
Asotin County1 Jul 2027——Scan from recent sales
Adams CountyNot yet published——Scan from recent sales
San Juan County1 Jul 2027——Scan from recent sales
Pend Oreille County1 Jul 2027——Scan from recent sales
Skamania CountyNot yet published——Scan from recent sales
Lincoln County1 Jul 2027——Scan from recent sales
Ferry County1 Jul 2027——Scan from recent sales
Wahkiakum County1 Jul 2027——Scan from recent sales
Columbia CountyNot yet published——Scan from recent sales
Garfield County1 Jul 2027——Scan from recent sales
Questions

Washington questions

When is the property tax appeal deadline in Washington?

Later of July 1 of the assessment year or 30 days after the Change of Value Notice was mailed; up to 60 days where the county adopts it, e.g. King (RCW 84.40.038). Counties publish the exact date, and most notices print it.

Who hears a property tax appeal in Washington?

The County Board of Equalization hears the first appeal (RCW 84.40.038).

How is a home assessed in Washington?

At 100% of market value, valued as of January 1 of the assessment year (RCW 84.40.020); sales are adjusted to January 1 and must be within 5 years (WAC 458-14-087).

What does a Washington assessment notice show?

The market value, labeled “True and Fair Value”, and the assessed value, labeled “Assessed Value”. Notices mail: Rolling through the year by county and area; not between January 15 and February 15 (RCW 84.40.045).

Your home

Check your own assessment

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Sources
  1. RCW 84.40.030 (100% true and fair value)
  2. RCW 84.40.020 (January 1 valuation)
  3. RCW 84.40.0301 (burden of proof)
  4. RCW 84.40.038 (petition deadline)
  5. RCW 84.40.045 (change of value notice)
  6. RCW 84.48.150 (assessor’s comparables)
  7. RCW 84.55.010 (levy limit)
  8. WAC 458-14-087 (sales evidence)
  9. RCW 82.32.330 (REET affidavit disclosure)
  10. WA DOR, Appealing your property assessment
  11. Each county’s own appeal instructions and notices, read on the date shown on each county page.
  12. U.S. Census Bureau, county population estimates (2024).