Why Only 25% of King County Property Tax Appeals Succeed (And How to Be in That 25%)

The King County Board of Equalization publishes its statistics publicly: approximately 25% of appealed property values result in some type of reduction. That means three out of every four homeowners who go through the process — file the paperwork, wait for the hearing, take time off to attend — walk away with no change.

Understanding why most appeals fail is the first step to making sure yours does not.

Reason 1: The Assessor is presumed correct

Washington State law places the burden of proof entirely on the homeowner. The Board does not approach your hearing as a neutral arbiter — it starts from the position that the Assessor's value is correct. You must prove otherwise with evidence.

Many homeowners walk into a hearing with a general sense that their taxes are too high, without the specific, market-based evidence needed to overcome that presumption. The Board cannot rule in your favor based on feeling.

Reason 2: Weak or irrelevant comparables

The most common evidence problem is comparables that are too old, too different, or too far away to be persuasive. A sale from two years ago in a different neighborhood does not establish your home's current market value. The Board will note the weaknesses and give the Assessor the benefit of the doubt.

Reason 3: Inflated expectations from the start

Some appeal services project large savings to win your business. When the case actually goes to the Board, the evidence does not support the promised reduction. Homeowners who filed expecting a $20,000 assessment cut walk away with nothing — or a token $5,000 reduction that does not justify the time spent.

Reason 4: The assessment was actually correct

Not every home is over-assessed. In a market where home values have risen faster than assessments, the Assessor may actually be below market. Filing an appeal in that environment is a waste of time — and occasionally backfires if the Board decides to examine the assessment more closely.

What the 25% who succeed do differently

• They verify they have a case before filing — not after
• They bring 3–5 recent comparable sales of similar single-family homes nearby
• Their comparables are within 12 months, within 1 mile, and within 20% of their home's square footage
• They present the evidence clearly and let the numbers speak
• They do not argue about fairness — they argue about market value

The honest evaluation problem

The reason so many appeals fail is that homeowners never get an honest answer to the first question: do I actually have a case? Services with a financial incentive to file tend to encourage filing regardless. A preliminary evaluation that gives you a straight answer — yes, the evidence supports an appeal, or no, it does not — would prevent a huge proportion of the failed 75%.

Is your home over-assessed?

Enter your King County single-family home address and we will analyze your assessment against recent comparable sales in your neighborhood. The evaluation is free, the answer is honest, and if you have a strong case, we can file within 2 days.