All 39 Washington counties and county equivalents. 3 have been checked against the county's own schedule; the rest follow the state schedule below.
Washington statutory schedule
Instalment
Due
Notes
Second half
November 1, 2026
Remaining half is due October 31 and is delinquent after that date.
First half
May 1, 2027
Half the tax is due April 30; paying it keeps the other half current.
app.leg.wa.gov Delinquent taxes accrue 9% annual interest on residential property (12% on other property), with a 3% penalty on June 1 and another 8% on December 1 for non-residential property.
Washington property tax is billed and collected county by county, so the collector — not the state — issues the bill. Counties follow the same two statutory installment dates and penalty schedule.
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StacyApproved is an independent reference and is not a government agency. Deadlines change and exceptions apply — always confirm with your county treasurer using the official link on this page. Nothing here is tax, legal or financial advice.