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Snohomish County property taxes: a homeowner's guide
Understanding how your home is assessed — and how those numbers turn into a tax bill — helps you plan, budget, and decide whether an appeal is worthwhile. Here's a plain-English walk-through of how it works in Snohomish County.
How your home is valued
The Snohomish County Assessor's office is responsible for placing a market value on every parcel in the county as of January 1 each year. That value is based primarily on recent comparable sales in your neighborhood, adjusted for the physical characteristics of your home — square footage, year built, lot size, condition, and outbuildings. Value notices are typically mailed in the months following the assessment date.
The tax cycle
Values set in one year become the basis for the tax bill issued the following year. The Treasurer's office bills taxes annually with two installment due dates: the first half is due April 30, the second half October 31. Your bill reflects the levies of every taxing district overlapping your parcel — schools, fire, library, city, county, EMS, and any voter-approved bonds.
Appealing an assessment
If your assessed value looks higher than what your home would realistically sell for, you can appeal to the Snohomish County Board of Equalization. The deadline is July 1 or within 60 days of the value notice date, whichever is later. Strong appeals include three to five recent, genuinely comparable sales — same neighborhood, similar size, age, and condition — that support a lower value.
Programs worth knowing
Washington offers a property tax exemption for qualifying senior citizens, people with disabilities, and disabled veterans, plus a deferral program for eligible homeowners. Details and current income thresholds are available through the Assessor's office.
Frequently asked questions
How does the Snohomish County Assessor determine my home's value?
The Assessor's office estimates market value each year using recent comparable sales, physical characteristics of the property, and neighborhood-level trends. Values are set as of January 1 of the assessment year and mailed to owners in the following months.
When are Snohomish County property taxes due?
Property taxes are billed annually and payable in two installments — the first half is due April 30 and the second half is due October 31. Payments can be made online, by mail, or in person at the Treasurer's office in Everett.
Why did my assessed value change this year?
Values move with the local market. If comparable homes in your neighborhood sold for more (or less) than the prior year, your assessed value typically follows. Physical changes to the property — additions, remodels, new outbuildings — can also change the value.
Can I appeal my assessed value?
Yes. If you believe the assessed value exceeds market value, you can file an appeal with the Snohomish County Board of Equalization. The filing deadline is July 1 or within 60 days of the date on your value notice, whichever is later. Bring recent comparable sales to support your case.
How does assessed value affect what I actually pay?
Assessed value is one input. Your tax bill also depends on the total levies for the taxing districts that overlap your parcel — schools, fire, library, city, county, and voter-approved bonds. Two homes with the same assessed value in different districts can have different tax bills.
This guide is general information, not legal or tax advice. For your specific parcel, always confirm with the Snohomish County Assessor and Treasurer.