Property Taxes in Sammamish, Washington
Median Sammamish, Washington effective property tax rate: 0.89%, significantly lower than the national median of 1.02%, and lower than the Washington state median of 0.92%.
Median Sammamish, Washington home value: $1,384,000
Median annual Sammamish, Washington tax bill: $12,054, $9,654 higher than the national median property tax bill of $2,400.
How are property taxes in King County calculated?
Property taxes in Sammamish, Washington are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.
Understanding Sammamish's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Sammamish, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
How Does the Sammamish Property Tax Calculator Work?
Use this Sammamish property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Sammamish's median effective tax rate of 0.89% — based on actual property records in King County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local assessment district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Sammamish's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.
Your bill may vary by ZIP code within Sammamish: rates range from $10,388.00 in 98029 to $14,064.00 in 98075, primarily due to differences in school district levies and local assessment districts. Sammamish's median property tax bill of $12,054 is lower than King County's and lower than the national median property tax rate of 1.02%, but higher than the national median property tax bill of $2,400.
If your estimate is higher than expected, Ownwell can appeal your Sammamish assessment — you only pay if we save you money.
About Sammamish Property Taxes
About Property Taxes in Sammamish, King, Washington
Sammamish's median effective property tax rate of 0.89% is lower than the Washington state median of 0.92% and lower than the national median of 1.02%. This rate reflects the King County base levy combined with local school district levies and Local improvement districts (LIDs) that vary by subdivision throughout the city.
Property tax rates are not uniform across Sammamish. Homeowners in the 98029 ZIP code carry a median effective rate of 0.91%, while those in 98074 pay 0.85%. This spread reflects how school district boundaries and local assessment districts are drawn across King County. Understanding which part of Sammamish you live in can make a meaningful difference to your annual tax bill.
Sammamish homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor after the notice date in July each year.
If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.
Property Tax Rates Across Sammamish, King County, Washington
As noted earlier, local government entities set tax rates, which can vary widely within a state.
Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.
While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.
Below, you can compare Samammish's effective property tax rate to other cities in Washington and the median property tax rates in Washington and the U.S.
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Sammamish Tax Rate
0.89%
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective King County Tax Rate
0.99%
Median Effective Washington Tax Rate
0.92%
Median Effective United States Tax Rate
1.27%
Property Tax Rates Across Sammamish, King County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 98029 | 0.90% | 0.90% | 0.91% | 0.91% | 0.92% |
| 98074 | 0.83% | 0.84% | 0.85% | 0.86% | 0.87% |
| 98075 | 0.88% | 0.89% | 0.89% | 0.90% | 0.91% |
| 98007 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Save on Your Property Taxes and More With Ownwell
$774
Average Annual Tax Savings
Property Tax Assessment Values Across Sammamish, King County, Washington
When examining property taxes in Sammamish, Washington, understanding the distinction between "market value" and "assessed value" is crucial.
The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The King County assessment office estimates the market value for tax purposes.
The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.
Assessment notices:
In King County, assessment notices are sent in July each year. They'll typically reach your mailbox by the middle of July.
Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Sammamish.
For example, the median home price in Sammamish is $1,384,000, with tax bills ranging significantly across the county. 98075 has the highest median home price at $1,578,000.
Property Tax Assessment Values Across Sammamish, King County, Washington
Source: Ownwell
$275,000
$3,858,750
$7,442,500
Median Sammamish Market Value
$1,384,000
Median King County Market Value
$774,000
Median Washington Market Value
$501,600
Median United States Market Value
$274,101
Property Tax Assessment Values Across Sammamish, King County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 98029 | $536,000 | $1,026,000 | $1,144,000 | $1,254,000 | $1,391,000 |
| 98074 | $834,000 | $1,091,000 | $1,377,000 | $1,695,000 | $2,099,000 |
| 98075 | $1,017,000 | $1,290,000 | $1,578,000 | $1,836,000 | $2,164,000 |
| 98007 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Save on Your Property Taxes and More With Ownwell
$774
Average Annual Tax Savings
Property Tax Bills Across Sammamish, King County, Washington
Property tax bills in Sammamish are based on the assessed value of a home and the local tax rates set by taxing authorities in King County. For a home with a median home price of $1,384,000, the bill can vary widely depending on neighborhood, exemptions, and how the property is assessed. The 25th percentile tax bill is $9,868, while the 75th percentile tax bill is $14,959 and the 90th percentile reaches $17,851. That is far above the national median property tax rate of 1.02% and the national median property tax bill of $2,400, which can make property taxes a major expense for homeowners.
Higher assessed values can lead to larger bills, even when market conditions change. Ownwell helps homeowners challenge unfair assessments and identify savings opportunities, which can reduce property tax bills and protect long-term affordability.
Median Sammamish Tax Bill
$12,054
Median King County Tax Bill
$7,644
Median Washington Tax Bill
$4,512
Median United States Tax Bill
$3,209
Property Tax Bills Across Sammamish, King County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 98029 | $4,610 | $9,322 | $10,388 | $11,341 | $12,545 |
| 98074 | $6,812 | $9,223 | $11,684 | $14,453 | $17,560 |
| 98075 | $8,974 | $11,528 | $14,064 | $16,341 | $19,282 |
| 98007 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Save on Your Property Taxes and More With Ownwell
$774
Average Annual Tax Savings
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | July 1 |
| Tax Bill | |
| Issued | February 10 |
| Due Date #1 | April 30 |
| Due Date #2 | October 31 |
Links | |
|---|---|
| King Tax Assessor | |
| Phone | (206) 296-7300 |
| Website | blue.kingcounty.com |
| assessor.info@kingcounty.gov | |