King County, WashingtonProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Tax bill mailing
- February 2026; official 2026 pages reviewed publish the payment calendar but not a single tax-statement mailing day.
- Payment deadline
- April 30, 2026 for the first half (or full payment when the bill is under $50); October 31, 2026 for the second half; late charges begin after the applicable due date.
- Assessment appeal
- July 1, 2026 or within 60 calendar days after the mailing of the valuation notice, as applicable; petition to the King County Board of Equalization.
Exemptions & appeals
Exemption filing
September 1, 2026 for limited-income deferral applications; no separate 2026 senior-exemption deadline was published on the official pages reviewed.
Senior relief
King County administers Washington senior/disabled and disabled-veteran exemption and deferral programs for qualifying primary-residence owners. The official page lists a 2025 household-income limit of $88,998 for the deferral program and directs applicants to the county tax-relief portal; exemption income limits vary by program.
Valuation limits
Washington's constitutional 1% property-tax limit and the statutory 1% levy limit constrain taxing-district revenue, not an individual parcel's assessed value. County assessors value property at 100% of true and fair market value, so an individual assessed value can rise or fall by more or less than 1%; voter-approved excess levies, new construction, and senior/disabled relief are separate rules.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →