Jefferson County, WA follows the Washington statutory schedule. This page shows that schedule, the county's own website, and the late penalty — the county can still set its own dates, so confirm before you pay.
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…until second half — November 1, 2026
Instalment
Due date
Notes
Second half
November 1, 2026
Remaining half is due October 31 and is delinquent after that date.
First half
May 1, 2027
Half the tax is due April 30; paying it keeps the other half current.
Schedule: app.leg.wa.gov · Washington statute · not yet county-verified
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Statewide schedule — read this before you rely on it
Counties follow the same two statutory installment dates and penalty schedule. Most counties in this state follow these dates.
Delinquent taxes accrue 9% annual interest on residential property (12% on other property), with a 3% penalty on June 1 and another 8% on December 1 for non-residential property.
County treasurers must distribute tax statements by March 15, with the first half due April 30 and the second half October 31.
Jefferson County at a glance
Population: 33,714 (Census estimate, 2023) — the 27th largest of 39 Washington counties and county equivalents.
Typical tax bill: $3,419 a year (median for owner-occupied homes, ACS 2022 5-year estimate) — the Washington median is $4,158.
Land area: 1,803.7 sq mi, about 18.7 people per sq mi.
On a $400,000 purchase in Jefferson County, WA, property tax comes to about $2,300 a year — roughly $192 a month — at this county's effective rate of 0.57%.
$
Effective rate 0.57% = this county's median owner-occupied tax bill ($3,419, ACS 2022 5-year estimate) divided by the typical home value at the time ($594,814, Zillow, 2022-12-31). Exemptions the seller holds — homestead, senior, veteran — usually do not transfer with the deed, so a new purchase can run above this figure. The county assessor sets the assessed value; this is an estimate, not a quote.
How to pay Jefferson County property tax
County website:www.co.jefferson.wa.us — start here for the treasurer or tax collector page.
By post: mail to the county treasurer; the postmark usually counts, not the arrival date.
In person: the treasurer's office, with your bill or parcel number.
Escrow: if your mortgage escrows taxes, the servicer pays — you still owe any shortfall.
Is this county verified?
Not yet. Jefferson County is on the queue: we publish a county's own published dates once they have been checked against the county website. Ask for it and it moves up. Until then, the Washington statutory schedule above is the reliable starting point.
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CountyTaxDates is an independent reference and is not a government agency. Deadlines change and exceptions apply — always confirm with your county treasurer using the official link on this page. Nothing here is tax, legal or financial advice.