Missouri's car sales tax rate and what it covers
Missouri charges 4.225% sales tax on vehicle purchases as a state rate. However, your total tax depends on where you buy the car, because counties and cities in Missouri add their own local sales taxes on top of the state rate. Your final rate will be somewhere between 4.225% and 10.45%, depending on your location within the state.
The sales tax applies to the purchase price of the vehicle itself. If you buy a car for $20,000, you pay tax on that $20,000 — not on the full amount after trade-in or down payment. Trade-in value is subtracted from the purchase price before tax is calculated, which can lower your tax bill significantly.
Sales tax is collected at the point of sale by the dealer or private seller (if applicable), and you pay it when you complete the transaction. The tax is then remitted to the state and local tax authorities by the seller.
Key Takeaways
- Missouri's state sales tax on cars is 4.225%, but your actual rate includes local county and city taxes, which range from 0% to 6.225% additional.
- Trade-in value reduces the amount you pay tax on, so a $20,000 car with a $5,000 trade-in means you pay tax on $15,000.
- You can find your exact local rate by entering your zip code on the Missouri Department of Revenue website or asking the dealer before you buy.
- Sales tax is collected at the time of purchase and included in your final payment to the dealer.
How to find your exact local sales tax rate
Your county and city determine the additional local tax on top of Missouri's 4.225% state rate. The easiest way to find your exact rate is to visit the Missouri Department of Revenue website and use their sales tax rate lookup tool. Enter your zip code, and the tool will show you the combined state and local rate for your area.
You can also call your county assessor's office or the city clerk's office where you plan to buy the car. They can tell you the exact rate that applies to vehicle sales in that location. If you are buying from a dealer, ask them directly — they know the rate for their location and can calculate your tax before you sign paperwork.
Rates vary widely across Missouri. For example, St. Louis city has a combined rate around 8.6%, while some rural counties may be closer to 5% or 6%. Knowing your rate ahead of time helps you budget for the total cost of the purchase.
How sales tax is calculated on your purchase
The calculation is straightforward: take the sale price of the vehicle, subtract any trade-in value, then multiply by your local sales tax rate. If you buy a $25,000 car and trade in a vehicle worth $8,000, you pay tax on $17,000. At a 7% combined rate, your sales tax would be $1,190.
Some dealers show the sales tax separately on the bill of sale or purchase agreement. Others roll it into the total amount financed. Either way, you are paying the same amount. If you are financing the car, the sales tax is typically added to the loan amount, which means you also pay interest on it over the life of the loan.
If you buy a car from a private seller rather than a dealer, you still owe sales tax. You pay it when you register the vehicle with the Missouri Department of Revenue. Bring proof of the purchase price (the bill of sale) and your payment method to the DMV office.
Trade-in value and how it reduces your tax
Missouri allows you to subtract the value of a trade-in vehicle from the purchase price before calculating sales tax. This is called the trade-in allowance. If the dealer offers you $8,000 for your old car and the new car costs $25,000, you pay tax only on $17,000, not the full $25,000.
The trade-in must be a vehicle you own outright or have permission to trade (meaning the loan is paid off or the lender agrees). The dealer will handle the paperwork and apply the trade-in value to reduce your taxable purchase price. Make sure the trade-in amount is clearly listed on your bill of sale or purchase agreement so there is no confusion later.
If you do not have a trade-in, you pay tax on the full purchase price. This is why trading in an older vehicle can save you money — you reduce the amount subject to tax.
Sales tax on used cars versus new cars
Missouri charges the same sales tax rate on both new and used vehicles. The rate does not change based on whether the car is brand new or five years old. What matters is the purchase price: a $15,000 used car and a $15,000 new car are taxed at the same rate in your location.
However, used cars often cost less than new ones, so your total tax bill will be lower simply because the purchase price is lower. A $10,000 used car at 7% tax costs $700 in sales tax, while a $25,000 new car at the same rate costs $1,750.
Private sales of used cars are also subject to Missouri sales tax. You cannot avoid the tax by buying from an individual instead of a dealer. You will pay it when you register the vehicle at the DMV.
What happens if you buy a car out of state
If you buy a car in another state and bring it to Missouri, you may owe Missouri sales tax when you register it. Missouri taxes vehicles based on where they are registered, not where they are purchased. If you buy a car in Kansas and register it in Missouri, you pay Missouri's sales tax rate for your location.
Some states have lower sales tax rates than Missouri, but you cannot avoid Missouri tax by registering out of state. The state requires proof of tax payment from the original purchase or a tax payment to Missouri before issuing registration. If the out-of-state tax was lower than Missouri's rate, you may owe the difference.
If you are moving to Missouri and bringing a vehicle you already own and have registered elsewhere, contact the Missouri Department of Revenue to understand what you owe. Rules vary depending on how long you owned the vehicle and where it was previously registered.
Frequently Asked Questions
Do I have to pay sales tax if I buy a car with cash?
Yes. Sales tax applies whether you pay cash, finance the car, or use any other payment method. The tax is based on the purchase price, not how you pay for it. You owe the same amount whether you hand over cash or sign a loan agreement.
Can I deduct sales tax on my federal income tax return?
No. The federal government eliminated the sales tax deduction for most taxpayers in 2017. You cannot deduct car sales tax on your federal return. Some states offer their own deductions or credits, but Missouri does not have a state income tax, so there is no state return to file.
What if the dealer and I disagree on the sales tax amount?
Ask the dealer to show you the calculation on the bill of sale or purchase agreement. The rate should match your local combined rate (state plus county plus city). If it does not, contact the Missouri Department of Revenue or your local tax assessor's office to verify the correct rate. You can also ask the dealer to recalculate before you sign.
Is sales tax the same as registration fees?
No. Sales tax and registration fees are separate charges. Sales tax goes to the state and local governments. Registration fees go to the Missouri Department of Revenue to issue your license plates and title. You pay both when you buy and register a car, but they are calculated differently and go to different places.
Do I pay sales tax on a vehicle I lease instead of buy?
Yes, but it works differently. When you lease a car, the leasing company pays the sales tax on the full value of the vehicle, and that cost is built into your monthly lease payment. You do not pay sales tax separately at signing, but you are paying for it as part of the lease agreement.