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Can I appeal a property tax assessment that's higher than what I paid?

We bought our house in Kent, WA for $785k, but four comparable houses nearby have sold since for $705k to $730k. The countys new assessment came in at $812k, and our tax bill jumped to about $7,900. We have a few weeks to appeal, so can an agent tell me if our comps are strong enough to get it lowered?

Asked by Beckett R. | Kent, WA| 10-30-2026| 20 views|Market News & Trends|Updated 5 days ago

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Zoltan PeresztegiReal Estate Agent1 day ago

Beckett, before you spend time on the comps, run the savings math, because Washington property tax works differently than most people expect. Each taxing district collects a fixed dollar amount, so the rate adjusts to hit that number. Winning a lower value shifts your share of the total down, and your savings is your value reduction times your current effective rate. Your $7,900 bill on an $812,000 assessment is an effective rate of about 0.97%. If the board took you to $730,000, that saves roughly $800 a year. At $705,000 it is closer to $1,040. Those are rough numbers off your current rate, but they tell you what the appeal is worth, and it is worth filing. Your best exhibit is probably your own purchase. You paid $785,000 on the open market, and the county is saying $812,000. A recent arm's-length sale of the same house usually carries more weight than a stack of neighbor comps. The four sales at $705,000 to $730,000 help if they match your house on size, age, lot and condition, so line them up side by side. Brenda made the point about the January 1 valuation date, and it is the first thing to check, because sales that closed after that date show where the market went, not what the county should have valued on the valuation date. The one hard rule is the deadline. It is printed on your assessment notice and it does not move, so file with the King County Board of Equalization before it, not on it. I am a real estate professional, not an attorney or a tax advisor, and I work in the Los Angeles South Bay rather than in Kent, so have a Kent area agent look at your four comps before you file. If you would like a referral to a strong one, I am glad to make that introduction. I'm Zoltan Peresztegi, and I'm happy to help however I can. Zoltan

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Keith Jean PierreReal Estate Agent2 days ago

Beckett, if you were at $785K and went to $812K the difference is not significant. There is also no guarantee that you will get a ~ $705K assessment, even if you appeal/challenge it. Additionally, if you do, I cannot imagine the reduction is going to be majorly significant, especially when factoring in possible attorney's fees or the opportunity costs of you doing yourself. Not to mention it will change each year. Keith Jean-Pierre Managing Principal The Dapper Agents Real Estate Operations in ALL 50 States

Brenda AshbyReal Estate Agent4 days ago

Beckett, yes, you can appeal your King County property tax assessment, and the four comparable sales you've identified are worth investigating. However, there's an important detail that could determine whether your appeal is successful: the assessment date. In King County, properties are generally valued as of January 1 of each year, and that assessment determines the property taxes payable the following year. For example, your January 1, 2026, assessment determines your 2027 property taxes. Your 2026 property tax bill, on the other hand, is based on your January 1, 2025, assessment. Why does this matter? If you're challenging the $812,000 assessment dated January 1, 2026, the strongest comparable sales will generally be those closest to that date. The four nearby homes that sold for $705,000 to $730,000 could be valuable evidence, but their closing dates matter. If they sold several months after January 1, you'll need to demonstrate how those transactions reflect your home's market value on the assessment date. Your $785,000 purchase price is also relevant, particularly if you purchased near the valuation date in an arm's-length transaction. As a Realtor, I would recommend obtaining a Comparative Market Analysis (CMA) that considers the timing of those sales, square footage, condition, upgrades, lot size, and location. One more important point: Your current $7,900 tax bill and the new $812,000 assessment may represent two different tax years. Appealing the new assessment generally affects the following year's taxes, not the bill you've already received. King County generally requires appeals to be filed by the later of July 1 of the assessment year or 60 days after the valuation notice's mailing date. Check the specific deadline shown for your property. My recommendation is to have a local Realtor review those four comparable sales immediately and file your appeal before the deadline. You don't need to wait for the entire appeal process to conclude before paying taxes that are already due. Bottom line: You may have a strong argument, but the question isn't simply what nearby homes are selling for today. It's what your home was worth on the county's January 1 valuation date. You can learn more through the King County Board of Equalization. Brenda Ashby | REALTOR® JohnHart Real Estate | DRE License # 01700249

Alla NovytskaReal Estate Agent4 days ago

Beckett, from what you've described, it's worth filing. Your best evidence may not even be the comps. You paid $785k on the open market, and the county now says the house is worth $27k more than that. A recent arm's-length sale of the home itself usually carries real weight in an appeal. The four comps help only if they're truly comparable. Check square footage, lot size, age and condition, plus how close each sale is to the date the county used for its valuation. A $705k sale of a smaller or dated house won't move anyone. Note how each one differs from yours. Call the county assessor's office before you file and ask which valuation date applies and how they want the evidence submitted. My license is in California, so have a Kent agent pull a proper comp report for you, and if it turns into a real dispute, a local real estate attorney is worth a call. Alla Novytska, Realtor®, JohnHart Real Estate, DRE #02254775

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