Property Taxes in Sammamish
What Homeowners Actually Pay
I get asked about property taxes almost as often as I get asked about school boundaries, and the honest answer is: it's not one number. It varies by ZIP code, by assessed value, and by which voter-approved levies are active in a given year. Here's what actually matters, including a couple of things buyers and longtime owners both tend to get wrong.
The Short Version
Sammamish's median effective property tax rate is roughly 0.89%–0.98% of assessed value, depending on the source and exact location
The average Sammamish homeowner pays somewhere in the $10,600–$12,300 range annually — well above the King County average of roughly $7,600–$8,500
Rates vary by ZIP: the 98029 area runs closer to 1.02%, while 98074 runs closer to 0.94%
2026 King County property tax collections rose about 10% countywide, driven mainly by voter-approved levies rather than rising home values alone
How Your Bill Actually Gets Calculated
Two numbers determine your bill: your property's assessed value (set annually by the King County Assessor, generally tracking market value) and the combined levy rate for every taxing district your property sits in. That combined rate typically includes the state school levy, King County, your local school district (Issaquah or Lake Washington), fire and EMS, library district, and the City of Sammamish itself — each collecting its own portion. Washington's constitution caps most regular levies at 1% of assessed value combined, though voter-approved special levies (school bonds, EMS levies) can push the effective rate above that cap in practice.
This is why two homes of similar value can have noticeably different tax bills — they may sit in different fire districts, different school boundary lines, or have different voter-approved levies stacked on top.
Why Sammamish Runs Higher Than the County Average
It's simple math, not a special Sammamish penalty; property tax is assessed as a percentage of value, and Sammamish home values are well above the King County median. A 0.9% rate on a $1.6M home produces a much bigger bill than the same rate on an $840,000 home — even though the rate itself isn't dramatically different from the rest of the county.
Payment Dates
King County splits property tax into two payments each year:
First half: due April 30
Second half: due October 31
Senior and Disabled Exemptions — Bigger Than Most Owners Realize
If you're 61 or older (or retired due to a qualifying disability), own and occupy your home as your primary residence, and your household income is under $84,000 for 2026, you may qualify for a property tax reduction of 30% to 90% depending on income level and assessed value. Some qualifying veterans with an 80%+ service-connected disability rating may qualify regardless of income. You can apply directly at senior-exemption.kingcounty.gov, and applications for the current tax year are generally due by December 31. This program is genuinely underused — King County estimates only about one in five eligible seniors are actually enrolled. If you or a family member has owned a Sammamish home for years and is on a fixed income, this is worth checking even if you assumed you didn't qualify; the income threshold has risen substantially in recent years. One more thing worth knowing: Washington passed legislation in 2026 (Senate Bill 6162) that overhauls this program starting with the 2027 tax year, moving to a tiered income structure with higher thresholds than today's flat $84,000 cutoff. If you're currently just over the limit, it's worth checking back once the updated thresholds are published, which are rolling out this month for the upcoming assessment cycle.
Yes — if you believe the Assessor's valuation is higher than your home's actual market value, you can file an appeal with the King County Board of Equalization, generally within a set window after your valuation notice is mailed. The most persuasive appeals come with real comparable sales data, not just a general sense that the number feels high. If you're unsure whether an appeal is worth pursuing, pulling recent comps for your specific neighborhood is the first step — I'm happy to help with that even outside of a active listing.Can You Appeal Your Assessment?
Build the current tax bill into your monthly payment math before you fall in love with a listing — at Sammamish's price point, taxes alone can run $900–$1,000+ per month. Also confirm whether the home you're considering falls under any pending special levies or bond measures that could affect future bills, and don't assume the prior owner's bill (often based on a lower assessed value locked in years ago) will match yours once the sale reassesses the property.What This Means If You're Buying
Frequently Asked Questions
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The average Sammamish homeowner pays roughly $10,600–$12,300 per year, reflecting an effective tax rate of about 0.89%–0.98% applied to the area's high assessed values.
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The tax rate itself is only slightly above the county average, but because Sammamish home values are significantly higher than the county median, the actual dollar amount owed is well above average — often $3,000+ more per year than a typical King County home.
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Property taxes are paid in two installments: the first half is due April 30, and the second half is due October 31.
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Yes. Washington's senior and disabled exemption program can reduce property taxes by 30% to 90% for qualifying homeowners age 61+ with household income under $84,000 (as of 2026), with expanded thresholds coming for the 2027 tax year under recently passed legislation.
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Yes, through the King County Board of Equalization, generally within a limited window after receiving your valuation notice. Appeals supported by recent comparable sales data are far more likely to succeed than a general objection to the number.