The minimum combined sales tax rate for Seattle, Washington is 10.25%. This is the total of state, county and city sales tax rates.
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If you itemize your deductions, you can take the sales tax deduction. For tax years 2018 through 2025, the SALT deduction (which includes sales tax) is capped at $10,000. That means if the combined total of your sales tax, real estate tax, and personal property tax amounts to $15,000, you can only deduct $10,000 maximum.
That sales tax rate is effective April 1, 2021. From January 1, 2021 through March 30, 2021, the rate was 10.1%.