City rate guide · Reviewed August 11, 2026
King County Rta, Washington Sales Tax Rate
The combined sales tax rate in King County Rta, Washington is 10.3% as of 2026. That includes the Washington state rate of 6.5%.
Sales tax calculator for King County Rta
- Sales tax (10.3%)
- $10.30
- Total with tax
- $110.30
How this rate is composed
The Washington state sales tax rate is 6.5%. The combined 10.3% rate for King County Rta comes from Washington DOR local sales & use tax rates (Q3 2026) (2026-07-01 to 2026-09-30).
Literal combined state (6.5%) and local rate for the DOR location code.
County rows are the unincorporated-area rate; incorporated cities are listed separately.
Rates change on official schedules — confirm the current rate and effective date against the source above before filing.
Related local sales tax rates in Washington
Compare the county and same-type jurisdictions with the closest combined rates.
King County Rta sales tax questions
What is the sales tax rate in King County Rta, Washington?
The combined sales tax rate is 10.3%. It includes the Washington state rate of 6.5% and applicable local rates.
How much sales tax is charged on a $100 purchase in King County Rta?
At the 10.3% combined rate, a $100 taxable purchase produces $10.30 in sales tax.
When was the King County Rta sales tax rate reviewed?
Prophit.ai reviewed this guide on 2026-08-11 using Washington DOR local sales & use tax rates (Q3 2026). Confirm the official source before filing because rates can change.
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