What You'll Pay in Sales Tax When Buying a Car in Missouri

Missouri's car sales tax rate and how it applies to your purchase

Missouri charges 4.225% sales tax on vehicle purchases at the state level. However, your total sales tax will be higher because Missouri counties and cities add their own local sales taxes on top of the state rate. The combined rate you pay depends on where the vehicle is registered, not where you buy it.

When you buy a car in Missouri, the dealer collects sales tax based on the address where you'll register the vehicle. If you live in St. Louis city, you pay a different total rate than someone in rural Pike County. The state portion stays at 4.225%, but local additions range from 0.5% to 5.725%, making combined rates vary from 4.725% to 9.95% across the state.

You pay sales tax on the full purchase price of the vehicle, including any add-ons or dealer packages. Trade-in value does not reduce the taxable amount in Missouri — you pay tax on the new vehicle's price, then receive credit for your trade-in as a separate transaction.

Key Takeaways

• Missouri's state sales tax on cars is 4.225%, but your total rate includes county and city taxes that range from 0.5% to 5.725% depending on your registration address.
• The dealer uses your vehicle registration address to determine which local taxes explore, not the address where the dealership is located.
• Sales tax in Missouri is calculated on the full purchase price; trade-in value does not reduce the amount subject to tax.
• You can find your exact local sales tax rate by entering your zip code on the Missouri Department of Revenue website or asking the dealer before you finalize the purchase.

How to find your exact local sales tax rate

The Missouri Department of Revenue publishes a sales tax rate lookup tool on its website. You enter your zip code or city name, and the tool shows you the combined state and local rate for that location. This is the rate the dealer will charge you when you buy.

You can also call your county assessor's office or the city tax collector to ask what the current local rate is. Rates occasionally change when cities or counties adjust their local tax ordinances, so asking directly before you buy ensures you have the most current figure.

Some dealerships will also tell you the rate upfront if you ask. Since the rate depends on where you register the vehicle, not where the dealership is, make sure you give them your actual registration address — not the dealership's address — so they calculate correctly.

What happens if you buy from out of state

If you buy a car outside Missouri and bring it into the state to register it, you owe Missouri sales tax on that purchase. Missouri law requires you to pay sales tax based on the vehicle's purchase price when you register it, even if you bought it in another state where you paid a different rate or no sales tax at all.

When you register an out-of-state vehicle in Missouri, the Department of Revenue collects the tax as part of the registration process. You'll pay the combined state and local rate for your registration address. If you already paid sales tax in another state, Missouri may give you a credit for that amount, but you still owe the difference if Missouri's rate is higher.

Sales tax on used cars versus new cars

Missouri charges the same sales tax rate on used vehicles as it does on new ones — 4.225% state plus your local rate. The age or mileage of the car does not change the tax you owe; it is based on the purchase price you negotiate with the seller.

If you buy a used car from a private seller rather than a dealer, you still owe sales tax when you register the vehicle in Missouri. The tax is collected at the time of registration based on the purchase price shown on your bill of sale. Some people mistakenly believe private sales are tax-free in Missouri, but that is not the case.

Trade-in credits and how they affect your tax bill

When you trade in a vehicle as part of your purchase, Missouri does not allow you to subtract the trade-in value from the price before calculating sales tax. You pay tax on the full purchase price of the new vehicle, and the trade-in is handled as a separate credit toward what you owe the dealer.

For example, if you buy a car for $20,000 and trade in a vehicle worth $5,000, you pay sales tax on the full $20,000, not on $15,000. The $5,000 trade-in credit reduces the amount of money you hand over to the dealer, but it does not reduce your tax liability.

Calculating your total cost before you buy

To estimate what you will pay in sales tax, multiply the vehicle's purchase price by your combined sales tax rate. If you are buying a $25,000 car in a county with a 7.5% combined rate, your sales tax will be $1,875.

Add this amount to the purchase price, plus any documentation fees, registration fees, and dealer fees, to get your total out-of-pocket cost. Missouri's documentation fee is set by the state and is the same everywhere, but dealer fees and add-ons vary by location and dealership. Ask the dealer for an itemized quote that shows the sales tax separately so you can see exactly what you are paying for.

Frequently Asked Questions

What if I buy a car in one Missouri county but register it in another?

You pay sales tax based on where you register the vehicle, not where you buy it. If you purchase a car in Boone County but register it in Jackson County, you pay Jackson County's combined sales tax rate. Tell the dealer your actual registration address so they charge the correct rate.

Do I pay sales tax on a vehicle I inherit or receive as a gift?

Missouri does not charge sales tax on inherited vehicles. For gifts, the tax treatment depends on whether the transfer is truly a gift or a sale. If you receive a vehicle as a gift with no money changing hands, you typically do not owe sales tax, but you will owe registration and title fees when you register it in your name.

Can I avoid sales tax by registering my car in a different state?

No. If you live in Missouri and register your vehicle in Missouri, you owe Missouri sales tax regardless of where you buy the car. Registering a vehicle in another state when you live in Missouri is illegal and can result in penalties and back taxes owed to the state.

What is included in the purchase price for sales tax purposes?

Sales tax applies to the base price of the vehicle plus any add-ons, packages, or upgrades you purchase from the dealer. It does not explore to documentation fees, registration fees, or financing charges, though those are separate costs you will owe.