Welcome to the Board of Equalization

The Board of Equalization was established under Chapter 84.48 RCW. County Boards of Equalization are quasi-judicial bodies, governed by the state Department of Revenue. A Board of Equalization is completely independent of the county Assessor's office.

Boards of Equalization, consisting of three to five citizen volunteers, provide taxpayers with the opportunity to appeal property assessments, including assessments of real and personal property, forest land, timber, and open space. Boards of Equalization also consider appeals for senior citizen property tax exemption denials. Boards of Equalization are responsible for providing an impartial hearing environment,thereby protecting each party's due-process rightswhile reaching a fair decision.

The current Mason County Board of Equalization is made up of three members and two alternate member positions. All serve three-year terms. The members usually are from each commissioner district. Members should have some knowledge of property values, and may not be an elected official or employed by an elected official. Member position are staggered three-year terms. Appointments are made by the County Commission

Information on the Board of Equalization may be obtained in the tax statutes (Chapters 84.08 and 84.48) of the Revised Code of Washington and the Washington Administrative Code (Chapter 458-14). Appeal time limits, RCW 84.40.038 and WAC: 458-14-056. Reconvening the Board, WAC 458-14-127. Hearings, WAC 458-14-116. Evidence of Value, WAC 458-14-087. Orders of the Board, WAC 458-14-116.

Appealing Your Property Tax Valuation to the County Board of Equalization

Appeal forms may be obtained from the Clerk of the Board of Equalization at 423 North Fifth Street, (Building 9), Shelton, WA 98584 A request for forms by mail can be made by contacting the clerk at (360) 427-9670 ext. 268. Leave your name, telephone number, parcel number, and mailing address. Forms can also be requested by email. Forms will be mailed the next business day. In addition, forms are available for download.

FILING DEADLINE NOTICE: The Mason County Assessor has sent out the 2024 assessment OFFICIAL NOTICE OF VALUE for real property, dated October 11, 2024.  The last day to appeal these valuations to the Board of Equalization is November 12, 2024.

Online Submission is NEW this year.

Appeals must be filed with the Board of Equalization by the filing deadline, July 1, of the assessment year or within 30 days of the date of the Assessor's Notice of Change of Value (COV).

Mail completed forms to:
Board of Equalization
411 N 5th Street
Shelton, WA 98584-3466