2025 PROPERTY TAX HIGHLIGHTS Overall property taxes for the 2025 tax year are $7.7 billion, an increase of approximately $121 million or 1.6% from the previous year of $7.6 billion. Total County property value increased by approximately 4.8%, from $833 billion in 2024 to $873 billion in 2025.
An instalment sale agreement between you and a credit provider allows you to buy a vehicle or asset using the principal debt, which you repay by means of regular instalments over an agreed period, with fees and interest.
An installment contract is a single contract that is completed by a series of performances –such as payments, performances of a service, or delivery of goods–rather than being performed all at one time. Installment contracts can provide that installments are to be performed by either one or both parties .
An address change can be made: By sending email to kingcountytreasurer@kingcounty. By completing the Name and Address Update box on your property tax payment stub at the time you are remitting payment. By clicking here to print a Name and Address Change Request Form. Mail form to: King County Treasury.
For the most part these voter-approved measures, and not increasing property values, are responsible for increases in property taxes. King County gets about 19% of your property taxes to fund services like roads, criminal justice, and public health.
You can send Form 9465 with the e-return, but the IRS must still approve the installment agreement form.