Understanding Property Taxes in King County, Washington

How King County Property Taxes Are Calculated

Property taxes in King County are calculated using the following formula:

(Assessed Value - Exemptions) × Tax Rate = Annual Property Tax

For example, if your home is assessed at $580,000 and you have no exemptions, your annual property tax would be:

$580,000 × 0.98% = $5,684

Assessment Process in King County

In King County, properties are assessed at 100% of their market value. The assessment is conducted by the county assessor's office.

Includes Seattle. Washington has no state income tax, so property taxes are important revenue source.

How to Pay Property Taxes in King County

Property taxes in King County are typically paid annually or semi-annually. Payment options include:

• Online payment through the county website
• Mail a check to the county treasurer
• In-person payment at the county office
• Through your mortgage escrow account

How to Appeal Your Assessment in King County

If you believe your property assessment is too high, you have the right to appeal. The process typically involves:

1. Filing an appeal with the county board of review
2. Providing evidence of comparable property values
3. Attending a hearing (optional but recommended)

Appeals must be filed within 30-60 days of receiving your assessment notice. Check with King County Assessor's Office for specific deadlines.

Frequently Asked Questions

When are property taxes due in King County?

Property tax due dates vary by county. In most cases, bills are sent in November and due by December 31st or January 31st of the following year.

Can I pay my property taxes in installments?

Yes, many counties offer installment payment plans. Contact King County Treasurer's Office for details.

Are property taxes deductible on federal income tax?

Yes, property taxes are deductible on Schedule A, but subject to the $40,400 SALT deduction cap (2026).