2026 Property Tax Due Dates
April 30
First half
Delinquent after: April 30
October 31
Second half
Delinquent after: October 31 (falls on a weekend; penalty-free through Monday, November 2)
Payment Methods
Online, Mail, In-Person
Whitman County Treasurer
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Whitman County Treasurer — P.O. Box 550, Colfax, WA 99111
In Person
Visit the Treasurer's office — 400 North Main Street, Colfax WA 99111, Mon-Fri 8am - 5pm
About Property Taxes in Washington
Washington State property taxes are administered at the county level. Property is assessed at 100% of its true and fair market value as of January 1. Washington levies both a state property tax (used for schools) and local taxes (county, city, school district, fire district, and others). The combined rates vary significantly by county. Washington's property tax system has strong protections for seniors and low-income homeowners, including an exemption that reduces or eliminates taxes for qualifying households regardless of property value.
Payment & Assessment
Washington property taxes are paid in two equal installments: First half: Due April 30 Second half: Due October 31 If the total tax is under $50, the full amount is due April 30. For residential property with four or fewer units (including manufactured homes), late payments carry no penalty, just 9% annual interest until paid. Other property types are charged a higher interest rate. If a deadline falls on a weekend or holiday, it moves to the next business day. Most counties offer online payment through the county treasurer's website. Contact your county for payment options.
Statewide framework for Washington. Your county's specific rates and deadlines are shown above.
Other Counties in Washington
About Whitman County
Whitman County is a county located in the U.S. state of Washington. As of the 2020 census, the population was 47,973. The county seat is Colfax, and its largest city is Pullman.
Source: Wikipedia — content available under CC BY-SA 4.0
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Due dates shown are for reference only. Contact the Whitman County Treasurer's office to confirm official deadlines before making payments.