Missouri › Saint Charles County
Saint Charles County car sales tax: 5.95% to 8.45%
The rate in Saint Charles County
- Vehicle sales tax in Saint Charles County is not a single number — it runs from 5.95% to 8.45% depending on which city you register in. Most of the county is at 7.95%.
- That is above the 6.725% most Missouri counties charge — about $428.75 more tax on a $35,000 car than the typical county in the state.
- No other county in Missouri charges this rate — Saint Charles sits at number 7 of 115 by combined rate.
Where the rate changes inside Saint Charles County
- 8.45% — Wentzville, Dardenne Prairie.
- 7.95% — New Melle, Saint Charles, Lake Saint Louis, O'Fallon, Saint Peters, Cottleville, Foristell.
- 7.45% — Augusta, Weldon Spring.
- 6.95% — Flint Hill, Flinthill, Josephville, Portage Des Sioux, West Alton.
- 5.95% — Saint Charles (outside city limits), O Fallon (outside city limits), Augusta (outside city limits), Defiance, Foristell (outside city limits), Lake Saint Louis (outside city limits), Portage Des Sioux (outside city limits), Saint Peters (outside city limits) and 2 more.
- This is why a county-wide figure is not enough here: two addresses in Saint Charles County can carry different tax on the same car, and in 12 of its ZIP codes the boundary runs through the middle so the ZIP alone cannot settle it. The calculator asks you which side you are on.
What a $35,000 car actually costs in Saint Charles County
- Sales tax (8.45% — Wentzville, Saint Charles County) — $3,009.96
- Doc fee (state cap) — $620.79
- Title fee — $8.50
- Title processing fee — $9.00
- Registration (by horsepower) (est.) — $21.25
- Registration processing fee — $9.00
- Temporary permit — $5.00
- Out the door — $38,683.50 on a $35,000 used car, before any down payment or financing.
ZIP codes in Saint Charles County
- 63301, 63302, 63303, 63304, 63332, 63338, 63341, 63346, 63348, 63365, 63366, 63367, 63368, 63373, 63376, 63385, 63386, 64096, 65085, 65347, 65667.
- Any of these resolves to Saint Charles County in the calculator, at whichever of the county's rates applies to that ZIP.
Saint Charles County against nearby counties
- Maries County is 7.891% — $20.65 LESS tax on a $35,000 car than Saint Charles County.
- Andrew County is 7.925% — $8.75 LESS tax on a $35,000 car than Saint Charles County.
- Mercer County is 7.975% — $8.75 MORE tax on a $35,000 car than Saint Charles County.
- Howard County is 8.1% — $52.50 MORE tax on a $35,000 car than Saint Charles County.
- This follows where you REGISTER, not where the dealer is, so a lower rate nearby only helps if you actually live there. It is not something you can choose at the dealership.
Run your own numbers
Common questions
Why is the car sales tax different in parts of Saint Charles County?
Cities inside the county can levy their own rate on top of the county and state rate, so the combined figure changes at the city line. In Saint Charles County it ranges from 5.95% to 8.45%.
What is the car sales tax rate in Saint Charles County?
It ranges from 5.95% to 8.45% depending on the city; most of the county is 7.95%.
How much is tax and fees on a $35,000 car in Saint Charles County?
About $3,683.50 on top of the price, bringing it to roughly $38,683.50 out the door. The breakdown is above.
Elsewhere in Missouri
Andrew County
7.925% on a vehicle purchase
Mercer County
7.975% on a vehicle purchase
Maries County
7.891% on a vehicle purchase
Cole County
7.85% on a vehicle purchase
Howard County
8.1% on a vehicle purchase
Full Missouri out-the-door guide
Rates, doc fees, registration and title for the whole state
How Missouri sales tax works
What sits in the taxable amount, and how the rate is sourced