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Verified May 2026

How to Calculate Sales Tax in Snohomish County, Washington

Step-by-step guide with current rates, filing rules, and exemptions verified March 2026

Current Snohomish County Sales Tax Rate

Jurisdiction Rate
Washington State Sales Tax 6.500%
City / Municipal Tax 3.200%
Total Combined Rate 9.700%
← View full rate breakdown for Snohomish County

How to Calculate Sales Tax in Snohomish County

  1. 1

    Find the combined rate

    The combined sales tax rate in Snohomish is 9.700%. This equals: Washington state rate of 6.500% + County 0.000% + City 3.200%.

  2. 2

    Convert the percentage to a decimal

    9.700 ÷ 100 = 0.0970

  3. 3

    Multiply by your purchase amount

    Example: $100.00 × 0.0970 = $9.70 in sales tax

  4. 4

    Add tax to the original price

    $100.00 + $9.70 = $109.70 total cost

What's Taxable in Washington?

Most tangible personal property is taxable in Washington. Check with the Washington Department of Revenue for specific exemption categories.

Do You Have Nexus in Washington?

Economic Nexus Threshold

If your business has over $100,000 in annual Washington sales or 200 transactions, you are required to collect and remit Washington sales tax. This applies to out-of-state remote sellers too.

Expert Sales Tax Tips for Snohomish

Out-of-State Sellers

Selling into Washington from out of state? Register before you cross the $100,000 threshold to avoid back taxes and penalties.

Frequently Asked Questions

File online at the Washington Department of Revenue website. Deadlines vary by filing frequency. Late filing typically incurs a penalty of 10–25% of unpaid tax.
Prescription drugs are commonly exempt in Washington. Check the Department of Revenue for a full exemption schedule.
Late sales tax filing in Washington typically results in a penalty of 10–25% of the unpaid tax amount, plus monthly interest charges. File on time to avoid these costs.
Yes. Submit a refund claim to the Washington Department of Revenue. Refunds are typically processed within 60–90 days of a valid claim.
Yes, if you exceed $100,000 in annual sales or 200 transactions in Washington, you must register and collect sales tax — regardless of where your business is based.
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Sales Tax Calculator

Using 9.700% rate for Snohomish

$
Tax Amount $0.00
Total with Tax $100.00

Rate applied: 9.700% combined