Tax Statements and Payment Due Dates.
All real and personal property in Washington is subject to property tax, unless the law provides a specific exemption.  All taxes due on real and personal property are due and payable to the treasurer.  To avoid interest and penalties, at least half of the amount owed is due by April 30, and the balance is due by October 31.  If the tax is less than $50, the entire payment must be paid in full by April 30.
 
Tax Delinquencies.
Delinquent tax payments are subject to interest and penalties.  In 2021 the Legislature made adjustments to the rates for different types of property.
 
Until December 31, 2022, interest on delinquent taxes is charged at a rate of 12 percent per year for all real property.
 
Beginning January 1, 2023, interest charged on delinquent taxes is:

• 12 percent per year for all nonresidential real property and for residential real property with more than 4 units; or
• 9 percent per year for all residential real property with four or fewer units.

In addition, a 3 percent penalty is imposed on the unpaid amount of current taxes on June 1, with an additional 8 percent penalty imposed on the unpaid amount of current taxes as of December 1.  These penalties were temporarily suspended for 2022, and penalties on residential real property with four or fewer units were eliminated permanently.

Applicability of interest rates and penalties to personal property was inadvertently left out of the  adjustments made in the 2021 session.

Personal property is treated the same as all real property for interest rates through 2022, with an interest rate of 12 percent per year.  Beginning January 1, 2023, personal property remains at the 12 percent rate.  Personal property is also subject to the same penalties as nonresidential real property and residential real property with more than four units.