Missouri charges 4.225% state sales tax on all vehicle purchases, plus local sales taxes that range from 0.5% to 2.5% depending on your county

Your total sales tax bill on a car in Missouri is the state rate plus your local rate combined. The state portion is always 4.225%, but the local portion varies by where you live. A car that costs $20,000 in one county might have a different total tax than the same car in another county, even though the state rate stays the same.

The tax applies to the full purchase price of the vehicle, not a reduced amount. If you trade in an old car, Missouri does not subtract the trade-in value from the taxable price — you pay tax on the entire new vehicle price. Some states do allow a trade-in credit; Missouri does not.

You pay this tax at the time of purchase, usually to the dealer or directly to your county assessor's office if you buy from a private seller. The dealer collects it and sends it to the state and local tax authorities.

Key Takeaways

  • Missouri's state sales tax on vehicles is 4.225%, and you must add your local county rate on top of that.
  • Local rates range from 0.5% to 2.5% depending on which county you live in, making your total tax rate between 4.725% and 6.725%.
  • The tax is calculated on the full purchase price, and trade-in vehicles do not reduce the amount you are taxed on.
  • You pay the tax at the time of purchase, either to the dealer or directly to your county assessor if buying from a private party.

Finding your local sales tax rate by county

Your county's local sales tax rate is set by your county government and does not change based on the dealer you use or the time of year. You can find your exact rate by entering your county name on the Missouri Department of Revenue website, or by calling your county assessor's office directly.

The counties with the lowest local rates are Gasconade, Maries, Osage, and Pulaski counties, each at 0.5%. The highest local rates are in Boone, Cole, Franklin, Jasper, and Platte counties, each at 2.5%. Most counties fall somewhere in between.

If you live near a county line, do not assume your county's rate based on a nearby city name. Tax rates follow county boundaries, not city boundaries. Verify your rate before you buy so you know the exact total you will owe.

How the tax is calculated on your purchase price

The calculation is straightforward: multiply your vehicle's purchase price by your combined state and local tax rate. If you are buying a $25,000 car in Boone County (which has a 2.5% local rate), your calculation is $25,000 × 0.06725 (4.225% + 2.5%) = $1,681.25 in sales tax.

The purchase price includes any add-ons the dealer installs before sale, such as floor mats, paint protection, or window tinting. If you add these items after purchase, they are taxed separately at that time. Financing charges and loan interest are not taxed.

If you buy a used car from a dealer, the same tax rate applies to the dealer's selling price. If you buy from a private seller, you still owe the tax, but you pay it to your county assessor when you register the vehicle, not to the seller.

Tax on private party vehicle sales

When you buy a car from another individual rather than a dealer, you do not pay sales tax at the time of the sale. Instead, you pay it when you register the vehicle with your county assessor's office. Bring your bill of sale, proof of purchase price, and identification to complete the registration and pay the tax.

The assessor's office calculates the tax based on the purchase price you report on the bill of sale. If you and the seller agree on a price of $15,000, that is the amount the tax is calculated on. The assessor does not appraise the vehicle or adjust the price for tax purposes.

You must register the vehicle within 30 days of purchase. If you delay registration, you may face penalties. Bring proof of insurance and a valid driver's license along with your bill of sale when you go to register.

Trade-in vehicles and sales tax

Missouri does not allow you to subtract a trade-in value from the purchase price before calculating sales tax. If you trade in a $5,000 car and buy a $20,000 car, you pay sales tax on the full $20,000, not on the $15,000 difference.

Some states offer a trade-in credit that reduces your taxable amount. Missouri is not one of them. This is an important difference if you are moving to Missouri from another state or comparing the cost of buying in different states.

The dealer handles the trade-in as a separate transaction from the new vehicle purchase. The trade-in reduces what you owe the dealer out of pocket, but it does not reduce the sales tax calculation.

Special cases and exemptions

Most vehicle purchases are taxed at the standard rate, but a few situations have different rules. If you buy a vehicle for business use and hold a Missouri resale certificate, you may not owe sales tax on the purchase. Contact your county assessor to determine whether your business qualifies.

Vehicles purchased by certain nonprofits or government agencies may be exempt from sales tax. If you are buying on behalf of an organization, ask your county assessor whether an exemption applies before you complete the purchase.

If you buy a vehicle out of state and bring it to Missouri, you owe Missouri sales tax when you register it, even though you paid tax in another state. Missouri does not give a credit for taxes paid elsewhere. The tax is due based on the purchase price and your Missouri county rate.

What happens if you do not pay sales tax

If you buy from a dealer, the dealer is required to collect and remit the tax. You cannot avoid it. If you buy from a private seller and do not register the vehicle in Missouri, you are not legally required to pay Missouri sales tax, but you cannot legally drive the vehicle on public roads without registration.

If you register a vehicle without paying the sales tax owed, the assessor's office will calculate and bill you for it. Failure to pay can result in penalties and interest charges added to your bill. The longer you delay, the more you owe.

If you are unsure whether you owe tax on a particular purchase, contact your county assessor's office before registration. It is faster and cheaper to pay the correct amount upfront than to deal with penalties later.

Frequently Asked Questions

Do I pay sales tax on a vehicle I buy out of state and register in Missouri?

Yes. When you register an out-of-state vehicle in Missouri, you owe Missouri sales tax based on the purchase price and your county's tax rate. Missouri does not give a credit for sales tax you paid in another state. You pay the full Missouri tax when you register.

Can I avoid sales tax by buying a vehicle in a county with a lower tax rate?

No. The tax rate that applies is the rate in the county where you register the vehicle, not where you buy it. If you live in a high-tax county and buy a car in a low-tax county, you still pay your home county's rate when you register it.

What if the dealer and I disagree on the purchase price for tax purposes?

The dealer's invoice or bill of sale is the document used to calculate tax. If you believe the price is incorrect, resolve it with the dealer before you sign. Once the vehicle is registered, the assessor uses the documented purchase price to calculate what you owe.

Is sales tax on a vehicle deductible on my federal income tax?

Sales tax on a personal vehicle is not deductible on your federal return. If you buy a vehicle for business use, you may be able to deduct the vehicle's cost through depreciation or a Section 179 deduction, but the sales tax itself is not separately deductible. Consult a tax professional about your specific situation.

Do I owe sales tax if I inherit a vehicle from someone in Missouri?

No. Inherited vehicles are not subject to Missouri sales tax. When you register an inherited vehicle, bring the will or probate documents showing you are the legal heir. The assessor will not charge sales tax on the transfer.