Sammamish, Franklin County, Washington Property Taxes

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Property Taxes in Sammamish, Washington

Median Sammamish, Washington effective property tax rate: 0.79%, significantly lower than the national median of 1.02%, and lower than the Washington state median of 0.92%.
Median Sammamish, Washington home value: $576,700
Median annual Sammamish, Washington tax bill: $4,530, $2,130 higher than the national median property tax bill of $2,400.

How are property taxes in Franklin 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

Sammamish, Franklin County, Washington Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

0.79%

Estimate Property Tax Bill

$4,556

$4,228

How Does the Sammamish Property Tax Calculator Work?

Use this Sammamish property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Sammamish's median effective tax rate of 0.79% — based on actual property records in Franklin County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local appraisal 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 local differences in school district levies and assessment districts.

For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Sammamish.

About Sammamish Property Taxes

About Property Taxes in Sammamish, Franklin, Washington

Sammamish's median effective property tax rate of 0.79% is lower than the Washington state median of 0.92% and lower than the national median of 1.02%. This rate reflects the Franklin 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 highest ZIP code carry a median effective rate of 0.79%, while those in the lowest ZIP code pay 0.79%. This spread — 0.00 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Franklin 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 before the July 1, 2026 deadline 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, Franklin 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 Sammamish's effective property tax rate to other cities in Washington and the median property tax rates in Washington and the U.S.

Property Tax Rates Across Sammamish, Franklin County, Washington

Source: Ownwell

0.59%

0.69%

0.79%

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

0.79%

Median Effective Franklin County Tax Rate

0.79%

Median Effective Washington Tax Rate

0.92%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Sammamish, Franklin County, Washington

Zip	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
98074	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Property Tax Assessment Values Across Sammamish, Franklin 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. Franklin County 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 Franklin County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of the month when notices are sent.

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 $576,700, with tax bills ranging significantly across the county. The median tax bill is $4,530, compared with the national median property tax rate of 1.02% and national median property tax bill of $2,400.

Property Tax Assessment Values Across Sammamish, Franklin County, Washington

Source: Ownwell

$93,400

$243,150

$392,900

Median Sammamish Market Value

$576,700

Median Franklin County Market Value

$384,500

Median Washington Market Value

$501,600

Median United States Market Value

$235,294

Property Tax Assessment Values Across Sammamish, Franklin County, Washington

Zip	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
98074	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Property Tax Bills Across Sammamish, Franklin County, Washington

How are property tax bills calculated in Sammamish, Washington?

Property tax bills in Sammamish are based on the assessed value of a home and the tax rates set by local taxing authorities. When a property’s market value rises, the assessed value can increase as well, which can lead to a higher tax bill. The final amount is determined by multiplying the assessed value by the applicable tax rate, with different levies funding services such as schools, roads, and public safety.

For homeowners, this means a higher-value home can carry a larger annual tax burden, especially in a market where the median home price is $576,700. The property tax bill in the area is $4,530 at the 25th, 75th, and 90th percentiles, showing how consistently high bills can be across many homes. Compared with the national median property tax bill of $2,400, homeowners in Sammamish often face significantly higher costs.

Property Tax Bills Across Sammamish, Franklin County, Washington

Source: Ownwell

$663

$1,878

$3,092

Median Sammamish Tax Bill

$4,530

Median Franklin County Tax Bill

$3,020

Median Washington Tax Bill

$4,512

Median United States Tax Bill

$2,400

Property Tax Bills Across Sammamish, Franklin County, Washington

Zip	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
98074	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Don't miss the deadline to appeal!

Dates
Appeal Deadline	July 1

Links
Franklin Tax Assessor
Website	terra.co.franklin.wa.us

Frequently Asked Property Tax Questions in Sammamish, Washington

How are property taxes calculated in Sammamish, Washington?

Property taxes in Sammamish, Washington are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.

How do I appeal my property taxes in Sammamish, Washington?

To appeal your property taxes in Sammamish, Washington, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.

What property tax exemptions are available in Sammamish, Washington?

Common property tax exemptions in Sammamish, Washington include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.

When are property taxes due in Sammamish, Washington?

Property tax deadlines in Sammamish, Washington vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.

How can Ownwell help reduce my property taxes in Sammamish, Washington?

Ownwell provides professional property tax appeal services in Sammamish, Washington. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.