Commercial & Business Property
Washington Commercial Property Tax Appeals
Office, retail, industrial, multifamily, and special-purpose buildings in Washington are frequently over-assessed. Here's how commercial assessments work, the deadline to challenge yours, and what it takes to win.
How commercial is assessed
Washington (no state income tax) assesses at 100% of market value. A 1% annual levy-growth limit restrains total taxes, but individual commercial values still move with the market.
Burden of proof
In Washington the assessment carries a presumption of correctness that the taxpayer must overcome with clear, cogent, and convincing evidence — a notably high bar, so the evidence package must be strong.
Key to a Washington commercial appeal: A high evidentiary standard
Washington requires 'clear, cogent, and convincing' evidence to overturn a value — a full income approach and quality comparables are essential. Appeal to the County Board of Equalization (deadline ~July 1), then the State Board of Tax Appeals.
Washington Filing Deadline & Where to File
File With
County Board of Equalization
Deadline
July 1 (or within 60 days of notice for appeals of change)
Window Opens
After value change notices (varies by county)
Typical Duration
2–6 months
Washington has no income tax — property taxes are significant. 1% annual levy limit on total taxes. Senior/disabled exemption available. File with county board; State BTA for further appeal.
How commercial value is proven
Income-producing commercial property is usually valued by capitalizing net operating income (NOI ÷ market cap rate). The strongest appeals come with a clean rent roll, a trailing-12-month operating statement, current vacancy, and market cap-rate support. Where the property is owner-occupied or special-purpose, the cost and sales-comparison approaches carry more weight.
Evidence that wins a commercial appeal
- Current rent roll and a trailing-12-month operating statement
- Actual vacancy and collection loss (vs the assessor's stabilized assumption)
- Market capitalization rate support for the property type and submarket
- Recent arm's-length sales of comparable commercial buildings
- Evidence of physical, functional, or economic obsolescence
- Any change in use, tenancy, or condition since the assessment date
How to appeal a commercial assessment in Washington
- 1Pull the assessment — confirm the assessed value, the assessment ratio/class, and how the assessor derived it (income, cost, or sales).
- 2Build the valuation — capitalize actual net operating income and gather comparable sales to establish market value as of the assessment date.
- 3File before the deadline — submit to County Board of Equalization by July 1 (or within 60 days of notice for appeals of change), with the authorization signed by someone able to bind the owning entity.
- 4Present at the hearing — commercial hearings are evidence-driven; a clean income approach and credible comps carry the day.
Think your Washington commercial property is over-assessed?
We pull the assessment, build the income-approach case, and file the appeal. Fee: 20% of first-year savings — only if we win. Nothing upfront, and the reduction can hold for years.
Related resources
Assessment ratios, class rates, and deadlines in Washington are set by statute and can change year to year, and often vary by county or municipality. Verify current figures and dates with your county assessor or clerk of the board before filing. This page is general information, not legal or tax advice. TaxedFairly is a product of WebLab LLC.