King County Property Tax Appeal Deadline
Deadline varies by county — check your county's appraisal district.
Key Dates for King County
| Appeal deadline | An appeal petition to the King County Board of Appeals and Equalization must be postmarked, hand delivered, or filed online by the LATER of (a) July 1 of the assessment year or (b) 60 days from the mailing date printed on the property value notice. Washington does not use a single fixed statewide date — the 60-day-from-notice window controls when a notice mails after May 2. There is no filing fee. |
|---|---|
| Lien date | January 1, 2026 |
| Statute | RCW 84.40.038(1) |