Dewey, Oklahoma sales tax rate: 8.9%
Last updated Checked monthly
The sales tax rate in Dewey, Oklahoma is 8.9%. That’s the 4.5% state rate plus 4.4% in local taxes. It’s higher than 27 of the 73 Oklahoma cities we checked, and 1 other city pays the same.
Calculated by the 
Sales Tax APIThe same engine Zamp customers use.Dewey combined rate
8.9%
- Oklahoma state
- 4.5%
- Washington CountyCounty
- 1%
- DeweyCity
- 3.4%
Dewey sales tax calculator
Enter a price and what you’re selling.
- OklahomaState · 4.5%$4.50
- Washington CountyCounty · 1%$1.00
- DeweyCity · 3.4%$3.40
Charging this at checkout? Zamp calculates it on every order and files the returns.
Book a demoDewey sales tax rate breakdown
State, county and city taxes add up to 8.9%.
| Jurisdiction | Type | Rate |
|---|---|---|
| State of Oklahoma | State | 4.5% |
| Washington County | County | 1% |
| Dewey | City | 3.4% |
| Combined rate | 8.9% |
Rate history
- July 20238.9%
- July 20248.9%
- July 20258.9%
- July 20268.9%
- Today8.9%
No change since July 2023.
Charge the right rate in Dewey, on every order.
Zamp calculates tax at each customer’s address, then files and pays every Oklahoma return for you, with a sales tax team you can call.
Dewey 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 Dewey, Oklahoma?
The combined sales tax rate in Dewey is 8.9% as of November 3, 2026. It’s made up of 4.5% Oklahoma state tax, 1% Washington County, 3.4% Dewey.
Does the sales tax rate vary within Dewey?
Dewey has no special-district taxes, so most addresses in the city pay the same 8.9%: Oklahoma’s 4.5% plus 1% county tax plus 3.4% city tax. This rate was calculated for the centre of Dewey; the calculator prices any exact address.
Is SaaS taxable in Dewey?
No.
Do online sellers have to collect sales tax in Dewey?
Yes, if they have nexus in Oklahoma: more than $100,000 in Oklahoma sales in the previous or current calendar year, or a physical presence in the state. They register with the Oklahoma Tax Commission and charge the rate at the buyer’s address.
Sources. Oklahoma Tax Commission · Zamp Sales Tax API, for the centre of Dewey. 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 Oklahoma return and handles notices, with a sales tax team you can call.
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