In short
Yes, a 2026 Seattle property tax appeal is worth reviewing when the assessed value looks higher than a buyer would pay. The 2026 King County filing window runs through July 1, or 60 days from your Official Property Value Notice mail date, whichever is later, per the King County Board of Equalization.
Seattle
Look up if you are overpaying on your Seattle home.
King County reassesses every home every year and leans on neighborhood comps without seeing condition.
Local facts
- Place
- Seattle
- Board
- King County Board of Equalization
- Window
- July 1, or 60 days from your Official Property Value Notice mail date, whichever is later
Should I appeal my Seattle property tax this year?
If the self-check raised a question, you can look it over yourself, or use FairAppeal to see if you are overpaying. In Seattle, the question is whether the assessed value still fits the specific home, block, and condition a buyer would actually see. Fair Appeal handles the full Seattle appeal from review through hearing and only charges a percentage of first-year tax savings when the appeal wins.
For the broader context, see the Seattle property taxes guide or the 2026 King County property tax appeal guide.