Washington Commercial Property Tax Appeals
Washington revalues every property, every year, at full market value — and gives every county a different appeal deadline. The calendar, the real effective rates by county, and where the leverage is.
Fixed Budgets, Floating Shares
Washington assesses every property, every year, at 100% of true and fair value as of January 1 — annual revaluation statewide, with a physical inspection at least every six years. There is no assessment ratio and no cap on your value: whatever the assessor says the building is worth is what gets taxed.
But the levy side is budget-based: taxing districts levy fixed dollar amounts, constrained by a constitutional 1% cap on regular levies and a roughly 1%-a-year growth lid. Rising values push rates down, not collections up — which means your assessment determines your share of the district's budget. An overvalued building quietly subsidizes every correctly-assessed neighbor until someone corrects it.
The procedural trap is the deadline: it's the later of July 1 or a county-set window after your value notice mails — 30 days by statute, 60 in counties that adopted the longer window. Notices land anywhere from spring to late summer depending on the county, so two owners in adjacent counties can face deadlines months apart.
Every Date That Matters
Washington's calendar floats on your county's notice date — which makes tracking it the first professional service an owner needs.
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January 1Valuation dateAll evidence — sales, income, occupancy, condition — is measured as of January 1 of the assessment year. Taxes are payable the following year.
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Spring – SummerValue change notices mailedCounties mail revaluation notices on their own schedules. The mailing date on your notice starts your personal appeal clock — file it somewhere safe and diary the deadline the day it arrives.
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July 1 or 30–60 daysCounty Board of Equalization petitionDue by the later of July 1 or your county's window after the notice mails: 60 days in King, Pierce, and Snohomish; 30 days in Spokane and by statute elsewhere. In practice, big-county deadlines often land mid-to-late summer.
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Fall – WinterBOE hearings & decisionsCounty boards hear petitions through the fall. Documentary valuation evidence carries these hearings — Washington boards expect a case, not a complaint.
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+30 days from mailed decisionState Board of Tax AppealsEither party may escalate to the state BTA within 30 days — counted from the mailing of the BOE decision, not receipt. Larger commercial reductions frequently happen at this level.
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April 30 / October 31Taxes due (following year)Payable in halves. Taxes are due even while an appeal is pending — reductions come back as refunds.
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January 1Assessment dateListing forms mail by January 1 to everyone on the rolls — and filing is required whether or not the form arrives. The only de minimis relief is $500 per account; a bill to raise it (HB 1004) hasn’t passed.
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April 30Listing due — alongside the tax billThe personal property listing (eListing in most counties) is due April 30 — the same day the first half of the prior year’s tax is due, a two-deadline day for equipment owners. No extensions; late filing accrues 5% per month to a 25% cap, and willful mislisting runs 100%.
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County by countyValue notices on local schedulesNo statute fixes a personal property notice date. Counties mail on their own schedules ahead of the July board session — the notice date, not the calendar, starts the clock.
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July 1 or 30–60 days from noticeBoard of Equalization petition — whichever is laterThe same statute covers both rolls, but the window width is county-set: Spokane runs 30 days; Snohomish, Clark, and Pierce have adopted 60. From the board’s decision, 30 days to the state Board of Tax Appeals.
County windows are set by each county's legislative authority and locked for three-year periods; always confirm the current window and your notice's mailing date. SVA tracks each county's notice mailings so the floating deadline never floats away. Personal property: listings RCW 84.40.020–.060; penalties RCW 84.40.130; petitions RCW 84.40.038 (same statute as real property, county-set window); $500 exemption RCW 84.36.015.
Market Value × Your Share of the Levy
A Washington bill is your market value times the sum of the overlapping districts' rates — and those rates are outputs, not inputs: each district's budget divided by its total assessed value. The constitutional cap holds regular levies to 1% of value; voter-approved levies stack on top.
The result is effective rates most owners overestimate: for taxes due in 2025, the statewide average was 0.82% of market value. That doesn't make over-assessment cheap — it makes it precise. At King County's 0.83%, every $1,000,000 of overstated value costs about $8,300 a year, every year, because Washington revalues annually and an uncorrected error simply rolls forward.
The annual cycle is also the opportunity: there is no waiting for a reassessment year. Every notice is a fresh chance to put actual income, vacancy, and condition in front of the board.
| County | BOE Petition Window | Effective Rate (2025) | Tax on $10M Commercial |
|---|---|---|---|
| King | 60 days from notice | 0.83% | ~$83,000 |
| Pierce | 60 days from notice | 0.92% | ~$92,000 |
| Snohomish | 60 days from notice | 0.77% | ~$77,000 |
| Spokane | 30 days from notice | 0.94% | ~$94,000 |
| Statewide average | Later of Jul 1 / 30–60 days | 0.82% | ~$82,000 |
Effective rates: Washington DOR Property Tax Statistics 2025 (taxes due 2025 as a percent of market value). Petition windows run from the later of July 1 or the days shown after the value notice mails; windows are county-adopted and can change on three-year cycles.
The Grounds That Actually Move Values
Annual mass appraisal at 100% of market value leaves plenty of room between the model and the building. The winning cases replace assumptions with evidence:
Market evidence at January 1
Comparable sales and market conditions as of the statutory valuation date — not the market when the notice arrived months later.
Actual income & expenses
Assessor pro formas assume stabilized rents and occupancy. Actual rent rolls, concessions, and expense loads frequently support a materially lower value.
Obsolescence the model can't see
Functional layouts the market has passed by, deferred capital needs, and economic obsolescence — documented and quantified, not asserted.
Data errors
Square footage, land/improvement allocation, and characteristics that survive years between physical inspections. Six-year inspection cycles preserve old mistakes.
The floating deadline
The later-of-July-1-or-notice rule with county-set windows is where owners lose the year before the case starts. Calendar discipline is a merit issue in Washington.
Annual cadence
Every year is a fresh window. An uncorrected value rolls forward and compounds; a corrected one resets the baseline the next roll builds on.
Common Questions
Did this year's notice overshoot?
Send us the notice and we'll screen the value against January 1 market evidence and your income performance at no cost — and flag your county's exact deadline while we're at it.
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