Missouri car-buying rules
These are the rules the Before the Lot planner uses for Missouri, with the source and date for each. They describe the rules and the planner's estimate; they are not legal or tax advice, and the dealer's quote and your state's documents are what count.
Dealer doc fee in Missouri
Cap: $620.79.
- How the figure changes: yearly (CPI), published in the Missouri Register after January 14.
- Law: RSMo 301.558; 12 CSR 10-26.231.
Called an 'administrative fee'. Earlier caps: $565.38 (2023), $587.43 (2024), $604.47 (2025). Optional, but must be the same for every retail customer, itemized, and carry the notice 'AN ADMINISTRATIVE FEE IS NOT AN OFFICIAL FEE'. RSMo 301.558.4 is written as a safe harbor: a fee at or below the amount isn't the unauthorized practice of law.
Sales tax in Missouri
- Tax: State and local sales tax on motor vehicles.
- State rate used: 4.225%.
- Local add-ons: Up to 6.25% on top of the state rate.
- Dollar cap on the tax: none in the data.
Plus city/county sales tax for your home address, paid at the license office when you title. Trade-in deducted.
Your local rate
Local tax on a car goes by where the buyer lives. Find your exact rate: Missouri official lookup (Motor Vehicle, Trailer, ATV and Watercraft Tax Calculator).
Trade-in tax credit
Yes. Missouri takes the trade-in value off the taxed price.
Does a maker's rebate lower the taxed price?
Yes. Requires a bill of sale showing the rebate.
Cancellation and return rights
No Missouri-specific right to cancel or return a dealership purchase is in the planner's data.
There is no federal cooling-off period for buying a car at a dealership; the FTC's door-to-door Cooling-Off Rule excludes dealers with a permanent place of business (16 CFR 429.3(a)). The FTC CARS Rule was vacated by the Fifth Circuit in January 2025 and formally withdrawn effective Feb 12, 2026 (91 FR 6507). No other state with a general used-car cooling-off right was found; NCLC calls California's the first in the nation.
Worked out-the-door example: a $35,000 vehicle
Built with the planner's own out-the-door formula: the tax is the state base rate times the vehicle price plus the doc fee, with no trade-in, rounded to the cent. Local taxes are not included.
| Line | Amount |
|---|---|
| Vehicle price (example) | $35,000 |
| Doc fee (the Missouri cap) | $620.79 |
| Sales tax at 4.225% on $35,620.79 | $1,504.98 |
| Title and registration (the planner's default estimate) | $250 |
| Out-the-door total | $37,375.77 |
Title and registration fees differ by state and vehicle; $250 is a placeholder, not a Missouri figure.
Plan a purchase in Missouri
Plan a purchase in Missouri opens the free planner with Missouri already chosen. Nothing is sent to a server; the choice rides in the link's fragment.
These rules feed two steps of the method: set your numbers and let dealers compete. To read a dealer's quote line by line, see reading an out-the-door quote. All states.