Potosi, Missouri sales tax rate: 6.225%
Last updated Checked monthly
The sales tax rate in Potosi, Missouri is 6.225%. That’s the 4.225% state rate plus 2% in local taxes. It’s higher than 100 of the 228 Missouri cities we checked, and 12 other cities pay the same.
Calculated by the 
Sales Tax APIThe same engine Zamp customers use.Potosi combined rate
6.225%
- Missouri state
- 4.225%
- Washington CountyCounty
- 2%
Potosi sales tax calculator
Enter a price and what you’re selling.
- MissouriState · 4.225%$4.23
- Washington CountyCounty · 2%$2.00
Charging this at checkout? Zamp calculates it on every order and files the returns.
Book a demoPotosi sales tax rate breakdown
State and county taxes add up to 6.225%.
| Jurisdiction | Type | Rate |
|---|---|---|
| State of Missouri | State | 4.225% |
| Washington County | County | 2% |
| Combined rate | 6.225% |
Rate history
- July 20236.725%
- July 20246.225%
- July 20256.225%
- July 20266.225%
- Today6.225%
Changed since July 2023.
Sales tax near Potosi
Closest cities
- Irondale9 mi7.725%
- Iron Mountain Lake19 mi5.85%
- Miramiguoa Park26 mi6.475%
- Parkway30 mi6.475%
- Leasburg30 mi4.225%
- Saint Clair31 mi6.475%
- Steelville32 mi4.225%
- Fredericktown36 mi4.225%
Elsewhere in Washington County
- Irondale7.725%
Charge the right rate in Potosi, on every order.
Zamp calculates tax at each customer’s address, then files and pays every Missouri return for you, with a sales tax team you can call.
Potosi 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 Potosi, Missouri?
The combined sales tax rate in Potosi is 6.225% as of November 2, 2026. It’s made up of 4.225% Missouri state tax, 2% Washington County.
Does the sales tax rate vary within Potosi?
Potosi has no special-district taxes, so most addresses in the city pay the same 6.225%: Missouri’s 4.225% plus 2% county tax. This rate was calculated for Potosi’s 63664 ZIP code; the calculator prices any exact address.
Is SaaS taxable in Potosi?
No.
Do online sellers have to collect sales tax in Potosi?
Yes, if they have nexus in Missouri: more than $100,000 in Missouri sales in the previous or current calendar year, or a physical presence in the state. They register with the Missouri Department of Revenue and charge the rate at the buyer’s address.
Sources. Missouri Department of Revenue · Zamp Sales Tax API, for Potosi’s 63664 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 Missouri return and handles notices, with a sales tax team you can call.
#1 rated support on G2
