- Assessor site
- https://dor.wa.gov/taxes-rates/property-tax/county-assessor-and-treasurer-websites ↗
- Search by
- office contact via the Washington DOR county-assessor directory / WSACA; parcel search via county assessor portal
- Reassessment cycle
- 39 ELECTED COUNTY ASSESSORS appraise all property at 100% of TRUE AND FAIR MARKET VALUE (highest and best use) as of JANUARY 1, ANNUALLY (some counties physically inspect on a 1/4 or 1/6 rotation with statistical updates between). The assessor also CALCULATES the LEVY RATES (lesser of each district's budget or its statutory limit) + certifies the roll to the Treasurer. The Washington DEPARTMENT OF REVENUE oversees + centrally assesses inter-county UTILITY property. Built-in LAG: the Jan 1 value feeds the NEXT year's bill (Jan 1, 2025 -> 2026 taxes).
- Reassessment trigger
- Values reset every year from the market (new construction added; no transfer-based reset). Washington is BUDGET-BASED: rising values do NOT create levy authority — each district adopts a budget + the assessor sets rate = lawful levy ÷ total taxable value, so when values rise the rate falls.
- Personal & intangible property
- Business personal property is taxable + listed annually with the county assessor (equipment/supplies/furnishings; household goods exempt). Inter-county utility/transportation property is centrally assessed by DOR.
- CRE forecasting note
- Model the LEVY, not just the value: rising values don't raise a district's lawful revenue (rate floats down), and the 1% LEVY LIMIT / 101% revenue limit (RCW 84.55 / Initiative 747 — 1% growth + new construction, unless a voter LEVY LID LIFT) drives the bill's trajectory. Watch the Jan 1 PRIOR-YEAR lag (a 2026 bill reflects Jan 1, 2025 — best appeal comps are sales near that date). No income tax, no fractional ratio. Burden of proof on the owner. BoE deadline JULY 1 OR 30 DAYS from the notice — 60 where the county has extended it; verify locally — whichever LATER. Personal property listed annually; utilities state-assessed.
- Residential note
- Washington values your home at 100% of what it would sell for, updated every year — but as of January 1 of the PRIOR year, so a 2026 bill reflects a January 1, 2025 value. Your taxes are that value times the combined levy rate, and because Washington caps district budgets (not your assessment), a rising value usually meets a falling rate rather than a proportional tax jump. If your assessment is above what comparable homes sold for near that January date, appeal to the county Board of Equalization — the deadline is July 1 or 30 days after your value notice (60 in counties that extended it), whichever is later, so check your notice. If you're 61+ or disabled with limited income, apply through the assessor for the senior/disabled exemption (one of the most generous in the country) or the tax deferral.
REVENUE DRIVEN RATES — Washington is BUDGET-BASED: rising assessed values do NOT raise a taxing district's lawful revenue. Each district adopts a budget, and the assessor sets the levy RATE equal to that lawful amount divided by the district's total taxable value — so when values go up, rates generally go DOWN. The hard limit is the 1% levy lid (RCW 84.55 / Initiative 747): a district's regular levy can grow only 1% a year over its prior high, plus new construction and annexation, unless voters pass a levy lid lift. Your bill is a share of many overlapping district budgets, so a big value jump doesn't mean a proportional tax increase.
RATIO CAUTION — Washington assesses at 100% of true and fair market value, so your assessed value should equal what the home would sell for — but two things distort the headline. First, there's a built-in LAG: your value is set as of January 1 of the PRIOR year (a 2026 bill reflects a January 1, 2025 value), so a fast-moving market can make the assessment look off. Second, what you actually owe is your assessed value TIMES the combined levy rate (regular plus voter-approved excess levies), and because rates float under the budget system, the value alone doesn't tell you the bill.
APPEAL DEADLINE — Washington's appeal deadline is a moving target: you must petition the county BOARD OF EQUALIZATION by JULY 1 OR within 30 days of the date your value notice was mailed — up to 60 in counties that adopted the longer window (many large ones have) — WHICHEVER IS LATER — and because counties mail notices on very different schedules, the real deadline ranges from mid-summer to late fall by county. You must use the official petition form (letters and phone calls don't count), the burden of proof is on you, and you can appeal only the VALUE, not the tax amount or levy rate.
FILING REQUIRED RELIEF — Washington's senior/disabled break is among the most generous in the nation but must be claimed through the county assessor: owners 61+ (or disabled, or a qualifying disabled veteran) under a county-specific income threshold get a tiered benefit — the taxable value is frozen at the qualifying year and some or all EXCESS levies (and, at lower incomes, some regular levies) are exempted, with the lowest-income qualifiers paying little or nothing. There's also a full DEFERRAL (income under a county-specific ceiling — 75% of county median household income through 2026 collections, rising to 90% for 2027 — with a 5%-interest state lien repaid at sale); disabled veterans with a 40%-or-higher service-connected rating (or a total-disability rating) qualify for the senior/disabled program at any age. None of it is automatic.
STATE ASSESSED — While the 39 county assessors value locally, the Washington DEPARTMENT OF REVENUE centrally assesses inter-county UTILITY and transportation property (railroads, pipelines, telecom, airlines) and apportions that value to the counties, and DOR oversees the levy-limit calculations. So part of the tax base — and the rules the assessor must apply to levies — sits at the state level, not purely with your county.
Note: The Yakima County assessor in Yakima appraises all property at 100% of true and fair market value as of January 1 (Washington assesses at full value annually, and the January 1 value feeds the following year's bill). Washington is budget-based: rising values don't raise district revenue — the levy rate floats, capped at 1% growth per district (Initiative 747). Reach the office through the Washington Department of Revenue assessor directory at the link; DOR oversees administration. To contest: petition the county Board of Equalization by July 1 or within 30 days of your value notice (60 in counties that have extended the window), whichever is later. Seniors 61+ and disabled owners can apply for a generous income-based exemption.
Primary sources: Washington DOR property tax (dor.wa.gov, 100% true and fair market value, senior/disabled exemption & deferral, assessor directory); RCW 84.55/Initiative 747 (1% levy limit / 101% revenue limit, lid lift); RCW 84.40 (Jan 1); Snohomish/Yakima/Jefferson assessors (annual revaluation since 2004, budget-based rate, BOE by July 1 or 30/60 days whichever later, value-not-tax appeals); askdoss/appealdesk (Jan 1 prior-year lag, $10/$1,000 regular-levy cap + excess levies, senior tiers, deferral ~$57k @5%, $200k disabled-vet, halves Apr 30/Oct 31, no income tax); WSACA/WACO 39-county directory (as of 2026-07-05). Confirm current rules and figures with the assessing authority before any use.