How Much Are Property Taxes on a $800,000 Home in King County Washington

The short answer: on an $800,000 home in King County Washington, you can expect to pay roughly $6,400 to $9,600 per year in property taxes, depending on where the home sits within the county and which local levies apply. That works out to approximately $533 to $800 per month added to your housing costs.

King County's overall effective property tax rate runs between approximately 0.80% and 1.20% of a home's assessed value, depending on the city, school district levies, fire district levies, and other local measures in effect. According to King County's own 2024 property tax overview, the average tax rate countywide was approximately $9.04 per $1,000 of assessed value in 2024, which translates to roughly 0.90%. Applied to an $800,000 assessed value, that produces a bill of about $7,232 per year.

The Effective Rate and What It Means for Your Budget

An effective rate of 0.90% on $800,000 produces $7,200 annually, or $600 per month. That number is meaningful because lenders include property taxes in your monthly PITI payment (principal, interest, taxes, and insurance), so a higher tax rate directly affects how much home you qualify to buy. On a 30-year loan at current rates, adding $600 per month in taxes reduces your purchasing power by roughly $80,000 to $100,000 compared to a market with half the effective rate.

Washington State has no personal income tax, and property taxes are one of the primary ways local governments and school districts fund services. That trade-off is worth understanding when comparing Washington to states that have both income taxes and lower property tax rates.

How Assessed Value Differs From Purchase Price

King County assesses properties at 100% of their estimated market value, reassessing every year. In practice, the assessed value on record when you buy may be lower than your purchase price, especially in a rising market. If you pay $800,000 for a home that the county currently assesses at $720,000, your first full-year tax bill will be based on $720,000, not $800,000. However, the county will reassess the property, and within one to two years your bill will likely reflect a value much closer to what you paid.

This lag can create a pleasant surprise in year one and a noticeable increase in year two or three. Budget for the higher figure from the start so the adjustment does not catch you off guard.

2. How King County Calculates Your Property Tax Bill

King County does not set a single flat tax rate for all properties. Instead, your bill is the sum of multiple individual levies from different taxing districts that overlap at your specific address. Understanding this layered system explains why two $800,000 homes a few miles apart can have annual tax bills that differ by $1,000 or more.

The Levy System Explained

Washington State caps regular property tax levies at 1% of assessed value ($10 per $1,000) for any single taxing district, and there is a combined cap of $10 per $1,000 for most regular levies stacked together. Voter-approved excess levies, such as school construction bonds and special levies, sit on top of that cap and are the main reason some areas of King County see effective rates above 1%.

The King County Assessor calculates each levy rate by dividing the total dollar amount a district is authorized to collect by the total assessed value of all taxable property in that district. When property values rise across the county, levy rates can actually fall even if the total dollars collected increase. This is why your rate in any given year is not entirely predictable from the prior year.

Which Taxing Districts Affect Your Rate

A typical King County homeowner's tax bill includes contributions from several overlapping districts. These commonly include the state school levy, a local school district levy, the county general fund, city or town levies, fire district levies, library district levies, emergency medical services levies, and any voter-approved bond measures. A home in unincorporated King County will not pay a city levy, but it may pay a higher county road levy instead.

The King County Assessor's website lets you look up the specific levy code for any parcel address, which shows the exact combination of districts applying to that property. This is the most reliable way to get a precise estimate before you make an offer.

3. How Property Tax Rates Vary by City Within King County

Location within King County has a significant effect on your annual tax bill. The county spans a wide range of incorporated cities and unincorporated areas, each with its own combination of levies. Here is a practical look at how an $800,000 assessed value plays out across several major King County cities, using approximate effective rates based on recent levy data.

Seattle vs. Bellevue vs. Redmond vs. Kirkland

Seattle: Homes within Seattle city limits typically carry effective rates in the range of 0.85% to 1.05%, reflecting the city levy, Seattle Public Schools levies, and various voter-approved measures. On an $800,000 assessed value, that produces an estimated annual bill of $6,800 to $8,400.

Bellevue: Bellevue's effective rates have generally run slightly lower than Seattle's in recent years, often in the 0.80% to 0.95% range, partly because Bellevue's high property values spread levy costs across a larger tax base. An $800,000 home in Bellevue might generate an annual bill of $6,400 to $7,600. For a deeper look at Bellevue's current market, see What Is the Average Home Price in Bellevue Washington Right Now in September 2026.

Redmond: Redmond, home to the Microsoft campus and the Marymoor Park area, sits in the Lake Washington School District. Effective rates here often land between 0.88% and 1.05%, putting an $800,000 home's annual bill at roughly $7,040 to $8,400.

Kirkland: Kirkland properties along the Lake Washington waterfront and in neighborhoods like Juanita and Totem Lake also fall within the Lake Washington School District. Effective rates are comparable to Redmond, generally 0.88% to 1.05%, making an $800,000 home's annual tax bill approximately $7,040 to $8,400.

Renton and Kent: Cities in the southern part of King County, including Renton and Kent, sometimes carry effective rates at the higher end of the county range, around 1.00% to 1.20%, because assessed values are lower on average and levy amounts are spread across a smaller tax base. An $800,000 home in these areas could see a bill of $8,000 to $9,600.

Why Two $800,000 Homes Can Have Very Different Bills

Even within the same city, two homes assessed at $800,000 can carry different tax bills if they sit in different fire districts, library districts, or if one is subject to a voter-approved bond levy that the other is not.

The most reliable way to compare specific properties is to look up the parcel detail on the King County Assessor's website or use the King County property tax calculator on SmartAsset, which lets you enter an address and estimated value to generate a localized estimate.

4. Exemptions and Programs That Can Lower Your King County Property Tax

Washington State offers several programs that can meaningfully reduce property taxes for qualifying homeowners. These are not automatic; you must apply through the King County Assessor's office, and eligibility depends on your age, income, disability status, or how the property is used.

Senior and Disabled Persons Exemption

Washington's Senior Citizen and Disabled Persons Property Tax Exemption is one of the most impactful relief programs available. To qualify as of September 2026, you generally need to be 61 or older (or retired due to disability), own and occupy the home as your primary residence, and meet household income thresholds set by the state. Income limits were updated in recent years and now extend eligibility to a broader range of moderate-income households. Qualifying homeowners may receive a reduction in their assessed value for levy purposes, which can cut hundreds or even thousands of dollars from an annual bill on an $800,000 property.

There is also a property tax deferral program for seniors and disabled persons who meet income requirements, allowing taxes to be deferred until the property is sold. This does not eliminate the tax but can preserve cash flow for homeowners on fixed incomes.

Current Use and Other Programs

Current use programs apply to agricultural land, timberland, and open space parcels, assessing them based on their current use rather than their highest and best use. These are less relevant to a typical $800,000 residential purchase in Seattle, Bellevue, or Kirkland, but they matter for buyers looking at larger parcels in eastern King County areas like Maple Valley, Black Diamond, or Enumclaw, where properties sometimes include acreage.

Washington also has a limited homestead exemption concept embedded in the senior exemption program, but unlike some other states, Washington does not offer a broad homestead exemption that reduces assessed value for all owner-occupants. Every homeowner pays taxes on full assessed value unless they qualify for one of the specific programs above.

5. How Property Taxes Factor Into Your Total Cost of Owning in King County

Property taxes are not just an annual bill you pay separately; they are built into your monthly mortgage payment if your lender requires an escrow account. On a conventional loan with less than 20% down, escrow is typically required. Even with 20% or more down, many buyers choose to escrow taxes and insurance for simplicity. At $7,200 per year, the monthly escrow contribution for taxes alone is $600.

Property Taxes at Closing and in Your Mortgage Payment

At closing in Washington, property taxes are prorated between buyer and seller based on the closing date. King County collects taxes in two installments: the first half is due April 30 and the second half is due October 31. If you close in September, the seller will typically credit you for the portion of the second-half taxes that accrued while they owned the property during the billing period. You will then pay the full second-half installment in October. Understanding this proration is important for budgeting your closing costs accurately.

If you want a full picture of what you will owe at the table, the closing costs article on this site covers proration and other buyer costs in detail: see Is Your Area a Good Place to Live in Washington for additional context on evaluating your purchase location.

How to Plan for Tax Increases After You Buy

King County reassesses properties annually, and if you buy in a rising market, your assessed value will likely increase in the years following your purchase. Washington State limits how much regular levy rates can grow, but voter-approved levies are not subject to those limits. New bond measures, school construction levies, and transportation measures can add to your bill over time. Budgeting for a 3% to 5% annual increase in your property tax bill is a reasonable planning assumption for most King County homeowners.

If you believe your assessed value is too high, you have the right to appeal to the King County Board of Equalization. The appeal window opens after the county mails your annual value notice, typically in the spring. Successful appeals can reduce your assessed value and lower your bill for that tax year.

National data reinforces why staying on top of your tax bill matters. According to HousingWire's coverage of ATTOM's 2024 property tax report, homeowners across the country saw their average property tax bills rise 2.7% in a single year, a trend that mirrors what King County buyers have experienced as assessed values have climbed alongside home prices. Planning for annual increases is not pessimism; it is sound financial preparation.