About Property Taxes

King County administers property taxes for the City of Newcastle. The King County Assessor’s Office provides tools and information to help property owners understand how properties are assessed, how values are set, and what programs can reduce taxes. These resources also explain annual tax statements and how property assessments can change over time.

For information about property taxes as a revenue source for the City of Newcastle, please visit the Finance Department pages.

Property Assessments

Each year, the King County Assessor assigns a value to each property. This value is based on market trends, recent sales, and the property’s features. This assessed value is used to calculate property taxes. The King County Assessor’s website lets property owners look up details like assessed value, past valuations, recent sales, and property information. These tools help explain how a property’s value was determined.

View King County Assessor’s Office Property Information Tools.

Assessment Appeals

If a property’s assessed value seems too high or incorrect, owners can appeal to the King County Assessor. Appeals use evidence such as comparable home sales or details about the property’s condition. The King County Assessor’s website has step-by-step guidance on how to file an appeal and what documents are needed.

Learn how to file an appeal with the King County Assessor’s Office.

Tax Relief Programs

King County offers several tax relief programs for property owners who may need help. These programs are available to seniors, people with disabilities, disabled veterans, and owners whose property has been damaged by storms or other events. The county also offers exemptions for certain home improvements to single-family dwellings, which can reduce property taxes. Each program has specific rules and eligibility requirements. Application forms and guidance are available on the King County Assessor’s website.

Learn more about tax relief for seniors and persons with disabilities.

Learn more about tax relief available for destroyed property.

Learn more about exemptions for home improvements to single-family dwellings.