Wentzville, Missouri sales tax rate: 8.45%
Last updated Checked monthly
The sales tax rate in Wentzville, Missouri is 8.45%. That’s the 4.225% state rate plus 4.225% in local taxes. It’s higher than 203 of the 228 Missouri cities we checked.
Calculated by the 
Sales Tax APIThe same engine Zamp customers use.Wentzville combined rate
8.45%
- Missouri state
- 4.225%
- St. Charles CountyCounty
- 1.725%
- WentzvilleCity
- 2.5%
Wentzville sales tax calculator
Enter a price and what you’re selling.
- MissouriState · 4.225%$4.23
- St. Charles CountyCounty · 1.725%$1.73
- Wentzville City (St. Charles County)City · 2.5%$2.50
Charging this at checkout? Zamp calculates it on every order and files the returns.
Book a demoWentzville sales tax rate breakdown
State, county and city taxes add up to 8.45%.
| Jurisdiction | Type | Rate |
|---|---|---|
| State of Missouri | State | 4.225% |
| St. Charles County | County | 1.725% |
| Wentzville City (St. Charles County) | City | 2.5% |
| Combined rate | 8.45% |
Rate history
- July 20238.45%
- July 20248.45%
- July 20258.45%
- July 20268.45%
- Today8.45%
No change since July 2023.
Sales tax near Wentzville
Closest cities
- Flinthill3 mi6.95%
- Josephville5 mi5.95%
- Foristell5 mi7.95%
- O'Fallon8 mi7.95%
- Wright City9 mi6.225%
- Augusta17 mi5.95%
- St. Charles19 mi7.95%
- New Haven24 mi8.725%
Elsewhere in Saint Charles County
- O'Fallon7.95%
- St. Charles7.95%
- Foristell7.95%
- Flinthill6.95%
- Josephville5.95%
- Augusta5.95%
Charge the right rate in Wentzville, 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.
Wentzville 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 Wentzville, Missouri?
The combined sales tax rate in Wentzville is 8.45% as of November 2, 2026. It’s made up of 4.225% Missouri state tax, 1.725% St. Charles County, 2.5% Wentzville City (St. Charles County).
Does the sales tax rate vary within Wentzville?
Wentzville has no special-district taxes, so most addresses in the city pay the same 8.45%: Missouri’s 4.225% plus 1.725% county tax plus 2.5% city tax. This rate was calculated for Wentzville’s 63385 ZIP code; the calculator prices any exact address.
Is SaaS taxable in Wentzville?
No.
Do online sellers have to collect sales tax in Wentzville?
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 Wentzville’s 63385 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.
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