Black Diamond, Washington sales tax rate: 9%
Last updated Checked monthly
The sales tax rate in Black Diamond, Washington is 9%. That’s the 6.5% state rate plus 2.5% in local taxes. It’s higher than 60 of the 110 Washington cities we checked, and 3 other cities pay the same.
Calculated by the 
Sales Tax APIThe same engine Zamp customers use.Black Diamond combined rate
9%
- Washington state
- 6.5%
- King CountyCounty
- 1.5%
- Black DiamondCity
- 0.1%
- King PTBASpecial district
- 0.9%
Black Diamond sales tax calculator
Enter a price and what you’re selling.
- WashingtonState · 6.5%$6.50
- King CountyCounty · 1.5%$1.50
- Black Diamond City (King County)City · 0.1%$0.10
- King PTBASpecial district · 0.9%$0.90
Charging this at checkout? Zamp calculates it on every order and files the returns.
Book a demoBlack Diamond sales tax rate breakdown
State, county, city and special district taxes add up to 9%. District lines don’t follow city limits, so some Black Diamond addresses pay a different rate.
| Jurisdiction | Type | Rate |
|---|---|---|
| State of Washington | State | 6.5% |
| King County | County | 1.5% |
| Black Diamond City (King County) | City | 0.1% |
| King PTBA | Special district | 0.9% |
| Combined rate | 9% |
Rate history
- July 20238.7%
- July 20248.8%
- July 20258.8%
- July 20269%
- Today9%
Changed since July 2023.
Sales tax near Black Diamond
Closest cities
- Maple Valley4 mi9.1%
- Enumclaw8 mi9%
- Auburn9 mi10.5%
- Kent10 mi10.4%
- Bonney Lake10 mi9.6%
- Sumner12 mi9.7%
- South Prairie13 mi8.2%
- Renton14 mi10.5%
Elsewhere in King County
- Seattle10.55%
- Bellevue10.3%
- Kent10.4%
- Renton10.5%
- Federal Way10.4%
- Kirkland10.4%
- Auburn10.5%
- Shoreline10.5%
- Burien10.4%
- Des Moines10.4%
- Maple Valley9.1%
- Mercer Island10.3%
Charge the right rate in Black Diamond, on every order.
Zamp calculates tax at each customer’s address, special districts included, then files and pays every Washington return for you, with a sales tax team you can call.
Black Diamond sales tax questions.
Still have questions? Call us at 1-866-438-9267 or email us at support@zamp.com.
What is the sales tax rate in Black Diamond, Washington?
The combined sales tax rate in Black Diamond is 9% as of November 2, 2026. It’s made up of 6.5% Washington state tax, 1.5% King County, 0.1% Black Diamond City (King County), 0.9% King PTBA.
Why does Black Diamond pay King PTBA tax?
A special district such as King PTBA levies its own sales tax on top of the state, county and city rates. District lines don’t always follow city limits, so an address a few streets away can have a different rate. This rate was calculated for Black Diamond’s 98010 ZIP code; the calculator prices any exact address.
Is SaaS taxable in Black Diamond?
Yes, at the full 9%.
Do online sellers have to collect sales tax in Black Diamond?
Yes, if they have nexus in Washington: more than $100,000 in Washington sales in the previous or current calendar year, or a physical presence in the state. They register with the Washington State Department of Revenue and charge the rate at the buyer’s address.
Sources. Washington State Department of Revenue · Zamp Sales Tax API, for Black Diamond’s 98010 ZIP code. Rates are checked monthly and are for information, not tax advice.
Sales tax, off your plate.
Zamp registers you, calculates every order at the customer’s address, files every Washington return and handles notices, with a sales tax team you can call.
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