Missouri charges 4.225% state sales tax on vehicle purchases, plus any local sales tax that applies in your county

The total sales tax you owe depends on where you buy the vehicle and where you register it. Missouri's state rate is fixed at 4.225%, but counties and cities add their own local taxes on top of that. Your final rate could range from 4.225% to over 8%, depending on your location. The tax is calculated on the selling price of the vehicle, not including any trade-in value you receive.

When you buy from a dealer, they collect the tax at the point of sale. When you buy from a private seller, you pay the tax to the Missouri Department of Revenue when you register the vehicle. Either way, you cannot avoid the tax — it is a requirement before the vehicle can be titled and registered in your name.

Key Takeaways

  • Missouri's state sales tax on vehicles is 4.225%, but your total rate includes local county and city taxes that vary by location.
  • The tax is calculated on the vehicle's selling price minus any trade-in allowance you receive.
  • Dealer purchases include tax at checkout; private sales require you to pay tax when you register the vehicle with the state.
  • You can find your exact local tax rate by entering your county and city into the Missouri Department of Revenue's tax rate lookup tool.

How to find your local sales tax rate

Missouri's Department of Revenue publishes a sales tax rate lookup tool on its website. You enter your county and city, and it shows you the combined state and local rate that applies to your address. This is the only reliable way to know your exact rate before you buy, because local rates vary significantly even within the same county.

If you are buying from a dealer, ask them what rate they are charging. They should tell you the breakdown: state rate plus local rate. If you are buying from a private seller, you will need to know your rate before you go to register the vehicle, so look it up in advance. The rate that applies is the one where you will register the vehicle, not where the seller lives.

Calculating the tax on a specific purchase

The formula is straightforward: multiply the vehicle's selling price by your local tax rate. If you are trading in another vehicle, subtract the trade-in value from the selling price first, then multiply by the tax rate. Missouri allows you to reduce your taxable amount by the trade-in value.

Example: You buy a car for $20,000 in St. Louis County. St. Louis County's combined rate is 8.612%. The calculation is $20,000 × 0.08612 = $1,722.40 in sales tax. If you trade in a vehicle worth $5,000, the taxable amount becomes $15,000, and the tax is $15,000 × 0.08612 = $1,291.80.

Dealer paperwork will show this calculation. If you are buying from a private seller, you will perform this calculation yourself when you register the vehicle with the Department of Revenue.

Differences between dealer and private sales

When you buy from a Missouri dealer, the dealer collects sales tax at the time of purchase. The tax is added to your final bill, and the dealer remits it to the state. You receive a receipt showing the tax amount charged.

When you buy from a private seller, no tax is collected at the time of sale. Instead, you pay the tax directly to the Missouri Department of Revenue when you register the vehicle. You will need to provide proof of the purchase price — typically a bill of sale — so the state can calculate the correct tax amount. If you do not have a bill of sale, the state may use the vehicle's assessed value to estimate the tax owed.

What the tax rate includes and excludes

Sales tax applies to the vehicle itself, not to add-ons or services purchased separately. If you buy extended warranties, paint protection, or other dealer add-ons, those are typically subject to sales tax as well. However, if you purchase a service contract or maintenance plan, the tax treatment depends on how it is structured — ask the dealer whether it is taxable.

Trade-in value is excluded from the taxable amount, as mentioned above. Rebates and manufacturer incentives are also excluded — the tax is calculated on the price after rebates are applied. Financing charges and interest are not subject to sales tax.

Registration and title fees are separate from sales tax

Missouri charges separate fees for vehicle registration and title transfer. These are not sales tax, and they are not calculated the same way. Registration fees depend on the vehicle's weight and age. Title transfer fees are a flat amount set by the state. Both are required, and both are paid when you register the vehicle.

When you register a vehicle you bought from a private seller, you will pay sales tax, registration fees, and title fees all at once to the Department of Revenue. The total cost is higher than the sales tax alone, so budget for all three when you plan your purchase.

Frequently Asked Questions

Do I have to pay sales tax if I buy a vehicle out of state and bring it to Missouri?

Yes. Missouri taxes vehicles based on where they are registered, not where they are purchased. If you buy a car in another state and register it in Missouri, you owe Missouri sales tax on the purchase price. You may receive a credit for any sales tax paid to the other state, but you will likely owe additional tax to Missouri to make up the difference.

What if I buy a used vehicle from a private seller — do I still pay the full sales tax rate?

Yes. Missouri does not have a separate tax rate for used vehicles. The 4.225% state rate plus your local rate applies whether the vehicle is new or used. The tax is calculated on the actual selling price you negotiated, not on the vehicle's book value or age.

Can I deduct sales tax on my vehicle purchase from my Missouri state income tax?

No. Missouri does not allow a deduction for vehicle sales tax on your state income tax return. Sales tax paid on vehicles is not deductible at the federal level either, unless you itemize deductions and live in a state that allows a sales tax deduction — Missouri does not.

What happens if I do not pay the sales tax when I register a vehicle from a private sale?

You cannot register the vehicle without paying the tax. The Department of Revenue will not issue a title or registration plates until the tax is paid in full. If you attempt to register without paying, your process will be rejected, and you will not be able to legally drive the vehicle.