Missouri's car sales tax rate and what it covers
Missouri charges 4.225% state sales tax on vehicle purchases. This is the base rate that applies statewide. However, your total sales tax will be higher because Missouri allows counties and cities to add their own local sales taxes on top of the state rate.
The tax applies to the purchase price of the vehicle itself. If you buy a car for $20,000, you pay 4.225% of that $20,000 to the state. Local taxes then stack on top. The total you owe depends on where the sale takes place — specifically, which county and city the dealer or private seller is located in.
Sales tax is collected at the point of sale. If you buy from a dealer, they collect it and send it to the state and local tax authorities. If you buy from a private party, you typically pay the tax when you register the vehicle with the Missouri Department of Revenue.
Key Takeaways
- Missouri's state sales tax on cars is 4.225%, but your actual rate will be higher because counties and cities add local taxes ranging from 0.5% to 5.975% on top.
- Your total sales tax rate depends on the location where you complete the purchase, not where you live or where you'll register the car.
- A $20,000 car purchase in Kansas City could cost $1,100 in total sales tax, while the same car in a different county could cost $900 or more.
- When you buy from a private party, you pay sales tax to the state when you register the vehicle, not at the time of purchase.
- Trade-in value reduces the taxable amount — you only pay sales tax on the net price after subtracting what the dealer gives you for your old vehicle.
How local taxes change your total rate
Missouri divides sales tax into state and local portions. The state takes 4.225%. On top of that, your county adds a tax, and your city may add another. These local rates vary widely across the state.
In Kansas City (Jackson County), the combined local rate is 5.975%, bringing your total to 10.2%. In St. Louis City, the combined local rate is 8.612%, bringing your total to 12.837%. In rural areas with lower local rates, you might pay only 5.725% total. The difference between the lowest and highest rate in Missouri is more than 7 percentage points, which on a $25,000 car means a difference of roughly $1,750 in tax owed.
The rate that applies is the one in effect where the transaction happens. If a dealer is located in one county and you live in another, you use the dealer's location rate. This matters if you're buying near a county line — crossing into a lower-tax county can reduce what you owe.
Trade-ins and how they reduce your tax bill
If you trade in a vehicle as part of the purchase, Missouri allows you to subtract the trade-in value from the purchase price before calculating sales tax. This is called a trade-in credit.
For example: you buy a car for $25,000 and trade in your old car for $5,000. You only pay sales tax on $20,000 (the net amount). At a 10% combined rate, you save $500 in tax by trading in rather than selling privately. The dealer handles this calculation at the point of sale.
The trade-in must be a vehicle. You cannot reduce the taxable amount by trading in other property or by claiming a personal discount. The dealer will document the trade-in value on your bill of sale, and that reduced amount is what gets taxed.
Private party sales and when you pay the tax
When you buy a car from a private individual rather than a dealer, you do not pay sales tax at the time of purchase. Instead, you pay it when you register the vehicle with the Missouri Department of Revenue.
You will need the bill of sale showing the purchase price. The Department of Revenue uses that price to calculate the tax owed. You pay the tax as part of the registration fee when you submit your paperwork and title transfer. If the seller does not provide a bill of sale or the price seems artificially low, the Department of Revenue may assess tax based on the vehicle's market value instead.
This means private party buyers should budget for sales tax as part of the registration cost, not as part of the purchase negotiation. The tax is due before the vehicle is registered and legal to drive on Missouri roads.
Special cases: used cars, leases, and out-of-state purchases
Used cars are taxed at the same rate as new cars — there is no separate used vehicle tax in Missouri. A $10,000 used car and a $10,000 new car both face the same sales tax percentage.
If you lease a vehicle, sales tax applies to the capitalized cost of the lease (roughly the vehicle's value), not to your monthly payments. The tax is usually rolled into your first lease payment or paid upfront.
If you buy a car out of state and bring it to Missouri, you owe Missouri sales tax when you register it, unless you paid sales tax in the other state at a rate equal to or higher than Missouri's rate. You will need proof of the out-of-state tax paid. This prevents double taxation but requires documentation.
How to find your specific county and city rate
To know your exact sales tax rate, you need to identify the county and city where the purchase will happen. The Missouri Department of Revenue publishes a complete list of all county and city rates on its website. You can search by county name or zip code.
If you are buying from a dealer, ask them what rate they will charge. They are required to disclose this before you sign paperwork. If you are buying from a private party, contact the Department of Revenue or use their online rate finder to determine what you will owe at registration.
Rates can change, though not frequently. If you are planning a purchase, check the current rate within a few days of the transaction to ensure your budget is accurate.
Frequently Asked Questions
Do I pay sales tax on a car I buy in another state and register in Missouri?
Yes, you owe Missouri sales tax when you register the vehicle, unless you already paid sales tax in the other state at a rate equal to or higher than Missouri's combined rate. You will need a receipt or documentation showing what you paid. If the other state's rate was lower, you owe the difference to Missouri.
What if I buy a car online from a dealer in another state?
You owe sales tax based on where the vehicle is delivered or where you take possession. If it is delivered to you in Missouri, you owe Missouri tax. If you pick it up out of state, you owe tax in that state, then owe Missouri tax when you register it (minus any credit for tax already paid).
Can I avoid sales tax by buying in a lower-tax county?
Only if the sale actually takes place in that county. Buying from a dealer located in a lower-tax area will use that area's rate. However, if you live in a higher-tax area and the dealer is in your area, you cannot claim the lower rate just because you prefer it. The location of the transaction controls the rate.
Is sales tax the only tax I pay on a car purchase in Missouri?
Sales tax is the main tax. You also pay a registration fee and a title fee when you register the vehicle, but these are separate from sales tax. Some counties charge an additional vehicle tax or property tax on registered vehicles, which is paid annually, not at purchase.
What happens if the dealer and I disagree on the purchase price for tax purposes?
The bill of sale or purchase agreement is the official record. If you believe the dealer has inflated the price to increase the tax, you can file a complaint with the Missouri Attorney General's office. For private sales, the Department of Revenue can review the stated price if it seems unreasonably low compared to the vehicle's market value.