Missouri charges 4.225% state sales tax on car purchases, plus local sales tax that varies by county

When you buy a car in Missouri, you pay the state's base sales tax rate of 4.225% on the purchase price. However, your total sales tax bill also includes a local sales tax that depends on which county you buy the car in. Local rates range from 0.5% to 5.475%, which means your combined rate could be anywhere from 4.725% to 9.7% depending on your location.

The sales tax applies to the full purchase price of the vehicle before any trade-in credit. If you trade in a car, Missouri allows you to subtract the trade-in value from the purchase price before calculating tax — but only if you trade with the same dealer. The tax is collected by the dealer at the time of sale and sent to the Missouri Department of Revenue.

You pay sales tax on used cars the same way as new cars. Private party sales are also taxable, though the tax is paid when you register the vehicle with the Missouri Department of Motor Vehicles rather than at the point of sale.

Key Takeaways

  • Missouri's state sales tax on cars is 4.225%, but your total rate includes local tax that varies by county from 0.5% to 5.475%.
  • The tax is calculated on the full purchase price minus any trade-in value if you trade with the same dealer.
  • You can find your exact local rate by entering your county or ZIP code on the Missouri Department of Revenue website.
  • Private party car sales are taxable when you register the vehicle, not at the time of purchase.

How to find your exact local sales tax rate

Your county's local sales tax rate is added to Missouri's 4.225% state rate. To find what you'll actually pay, visit the Missouri Department of Revenue's sales tax rate lookup tool and enter your county name or ZIP code. The tool shows the combined state and local rate for your location.

Local rates are set by individual counties and can change, so checking the official source is more reliable than asking a dealer or using an older rate you may have heard. Some counties have multiple rates depending on the specific city or district, so the ZIP code lookup is more precise than just knowing your county.

What the sales tax covers and what it doesn't

Sales tax applies to the vehicle itself and any parts or accessories installed by the dealer before you take possession. If you buy floor mats, a roof rack, or an extended warranty at the dealership as part of the sale, those are taxed too.

Sales tax does not explore to registration fees, title transfer fees, or dealer documentation fees — those are separate charges. It also does not explore to financing charges or interest if you take out a loan. Some dealers bundle these fees into the total amount financed, which can make the bill confusing, so ask the dealer to itemize what is taxable and what is not.

Trade-in credits and how they affect your tax bill

If you trade in a vehicle to the same dealer you're buying from, Missouri lets you subtract the trade-in value from the purchase price before calculating sales tax. For example, if you buy a car for $20,000 and trade in a vehicle worth $5,000, you pay sales tax on $15,000, not $20,000.

This trade-in credit only works when you trade with the dealer selling you the new car. If you sell your old car to a private buyer or a different dealer and use that money toward a purchase elsewhere, you pay tax on the full purchase price of the new vehicle. The trade-in value must be documented on the bill of sale for the tax reduction to explore.

Buying a car from a private seller in Missouri

When you buy a car from another person rather than a dealer, you don't pay sales tax at the point of sale. Instead, you pay it when you register the vehicle with the Missouri Department of Motor Vehicles. The tax is calculated on the purchase price you report on the title process.

Missouri uses the purchase price you declare, so be honest about what you paid — the state can challenge unusually low prices. You'll need the signed title from the seller, proof of purchase, and your ID to register the vehicle and pay the tax at the same time.

Sales tax on leased vehicles

If you lease a car in Missouri, you still owe sales tax, but it's calculated differently. The tax applies to the capitalized cost of the vehicle (the negotiated value), not the full manufacturer's suggested retail price. This usually results in a lower tax bill than you'd pay if you bought the same car outright.

The leasing company collects the tax as part of your lease agreement, so you don't calculate it separately. The tax is included in your monthly payment or collected upfront, depending on the lease terms.

Frequently Asked Questions

Do I pay sales tax on a car I buy out of state and bring to Missouri?

Yes. Missouri taxes all vehicles registered in the state, regardless of where you bought them. When you register an out-of-state purchase with the Missouri Department of Motor Vehicles, you'll owe sales tax at your local rate on the purchase price you paid.

Can I avoid sales tax by buying a car in a neighboring state?

No. You owe Missouri sales tax when you register the vehicle here, even if you bought it in Kansas, Oklahoma, Arkansas, or Illinois. The tax is based on where the car is registered, not where it was purchased.

What happens if I don't report the correct purchase price on a private sale?

The Missouri Department of Motor Vehicles can challenge the price you report if it seems unusually low compared to the vehicle's market value. If they suspect underreporting, they may assess tax based on the fair market value instead of your stated price.

Is sales tax due on a vehicle I inherit?

No. Vehicles transferred through inheritance or as a gift are not subject to Missouri sales tax. You'll need to provide documentation of the inheritance or gift when you register the vehicle, but you won't owe sales tax on the transfer.