Missouri Auto Loan Calculator (with Missouri Sales Tax & Fees)

Missouri's vehicle tax is not collected by the dealer at the point of sale the way it is in most states. It is a titling tax you pay at a license office when you register the car, and RSMo 144.440 and 144.070 source it to the buyer's address of registration. Drive from Kansas City to a dealership in a low-tax county to save on tax and you will save nothing: the rate that applies is the rate where the plate goes.

That matters more in Missouri than it would elsewhere because the local share is large. The state rate is 4.225%, but county use tax runs up to about 2.75% and municipal up to about 2.5%, so combined rates across the state range from the 4.225% floor to roughly 10%. The local portion is often bigger than the state portion. Two people buying the same car from the same dealer on the same day routinely pay tax bills that differ by more than $1,000 purely because of where they live.

This calculator does not ship a built-in rate for St. Louis, Kansas City, Springfield, Columbia, or anywhere else. The only correct source for a Missouri automotive rate is the Department of Revenue's quarterly Motor Vehicle Sales Tax Rate Chart, and that document could not be retrieved for verification. General sales tax rates published by commercial rate aggregators are not the same numbers and must not be substituted, because a jurisdiction's automotive rate and its general retail rate frequently differ. Look your rate up on the DOR chart, or ask the license office, then enter it above. Leaving the field at zero gives you the statewide floor, which is still useful for comparing loan offers.

Missouri also has a trade-in rule that no neighboring state matches, covered below.

The APR columns below are national averages, not Missouri figures. No primary source publishes average auto loan APR by state: Experian's report has no geographic cut, the CFPB publishes state origination volume but no rates, and the New York Fed publishes state delinquency only. The payment column is the part that is specific to Missouri, because it runs this calculator's own Missouri tax and fee rules at each tier's rate.

Payment assumptions: $35,000 vehicle price, $0 trade-in, $5,000 cash down, $522 dealer documentation fee, 60-month term, new-vehicle APR applied to the Missouri delivered price including tax and statutory fees. At the 6.39% overall new-car average the same purchase costs $624.65 a month.

The score bands are VantageScore 4.0, not FICO. The same borrower can land in a different tier under each model, so a FICO score pulled from a card issuer will not always match the band here. Source: Experian, State of the Automotive Finance Market, Q1 2026, slide 45.

Each row changes one input and leaves the rest at the baseline below. The dollar effects are this calculator's own output for Missouri, not a rule of thumb.

Baseline: $35,000 vehicle price, $0 trade-in, $5,000 cash down, $522 documentation fee, 60 months at 7.25% APR, giving a $637.60 payment and $6,247.05 of total interest.

Missouri's 4.225% state rate is collected at titling and sourced to your address of registration rather than the dealer's location. Four steps.

1. Net taxable base. RSMo 144.025 gives a full, uncapped credit for the trade-in allowance. Manufacturer rebates reduce the base as well.

The administrative fee is held outside this base. See the note below.

2. Titling tax. The state rate and your local rate are applied to the same base and reported separately, so you can see which government is getting what.

3. Title fee. A fixed $8.50, outside the tax base.

4. Amount financed and amortization. The trade-in works twice: it lowered the base in step one and it reduces what you borrow here.

That balance amortizes as a fixed-rate installment loan:

where $P$ is the financed amount, $i$ is the monthly rate (APR divided by 12), and $n$ is the term in months. Each period's interest is the outstanding balance times $i$, the remainder reduces principal, and the schedule reconciles to zero at maturity.

A note on the administrative fee. RSMo 301.558 authorizes a dealer administrative fee and rule 12 CSR 10-26.231 caps it, adjusting the cap annually for inflation. The verified ladder runs $500 in 2021, $523.50 in 2022, $565.38 in 2023, $587.43 in 2024, and $604.47 in 2025. The 2026 figure was not obtainable, so treat $604.47 as a floor for the current cap rather than the cap itself. Whether that fee is inside the taxable base is not settled in verifiable guidance, so this calculator adds it to your delivered price but keeps it out of the base. If your license office does tax it, add your combined rate times the fee: on a $522 fee at the 4.225% state rate that is $22.05.

This is the Missouri rule most buyers do not know about, and it is worth real money.

RSMo 144.025 does not only credit a vehicle traded in at the dealership. If you sell your old vehicle privately within 180 days before or after buying the new one, the sale price of the old vehicle reduces the taxable base on the new one. You present the notice of sale or a bill of sale at the license office and claim the credit there.

The practical consequence is that Missouri removes the usual reason to take a lowball trade-in offer. In most states, selling privately means giving up the tax credit, so a private buyer has to beat the dealer's offer by the trade-in credit's value before you come out ahead. In Missouri you can sell privately for the higher price and keep the tax credit, as long as you stay inside the 180-day window and keep the paperwork.

The window runs in both directions, so you can sell first and buy later, but 180 days is a hard limit and the credit is based on the documented sale price.

Missouri's 4.225% state rate is one of the lowest in the country and one of the least informative, because the titling tax is sourced to your address of registration and the local layer on top of it varies widely. The state figure comes first.

• Vehicle price: $35,000
• Trade-in allowance: $0
• Cash down: $5,000
• Dealer administrative fee: $522
• Local rate: 0% (state floor)
• Term: 60 months at 7.25% APR

Step 1 -- The taxable base. Purchase price less the trade-in allowance, with the administrative fee excluded: $35,000 - $0 = $35,000.00

Step 2 -- State titling tax at 4.225%. $35,000.00 x 4.225% = $1,478.75

Step 3 -- The title fee, outside the base. $8.50

Step 4 -- Total delivered price. $35,000 + $522.00 administrative fee + $1,478.75 + $8.50 = $37,009.25

Step 5 -- Amount financed. $37,009.25 - $0 trade-in - $5,000 cash down = $32,009.25

Step 6 -- The monthly payment. $32,009.25 at 7.25% over 60 months = $637.60

Step 7 -- Month 1. $32,009.25 x (7.25% / 12) = $193.39 interest, $444.21 principal, balance $31,565.04

Step 8 -- Month 2. $31,565.04 x (7.25% / 12) = $190.71 interest, $446.89 principal, balance $31,118.15. Cumulative interest: $384.10

Step 9 -- The running total. Interest through month 12 is $2,139.94, balance $26,497.99. Over 60 months, $6,247.05

Now see what your address does. Entering a 3% local rate, chosen here purely to illustrate the mechanism and not claimed for any particular Missouri jurisdiction, the tax becomes $1,478.75 state plus $1,050.00 local, for $2,528.75 total, and the payment rises to $658.52. A jurisdiction at the high end of Missouri's range would push that further still. Look up your own number before you treat any figure as final.

Add a $10,000 trade-in at the state rate alone and the base falls to $25,000, tax to $1,056.25, and the payment to $429.99. That trade-in saved $422.50 in tax. At the same illustrative 3% local rate the identical trade-in saves $722.50, because the credit is worth your whole combined rate rather than just the state share. The higher your local rate, the more a trade-in or a documented 180-day private sale is worth to you.

• Annual personal property tax. Missouri counties assess vehicles at 33 and 1/3 percent of market value and apply the local levy. You cannot renew your registration without a paid personal property tax receipt, so it is not optional. Levies vary by county and this calculator does not model it.
• Registration fees. Missouri bands registration by taxable horsepower rather than value or weight, and most passenger cars fall in the 24 to 35 horsepower band. Published processing fee amounts conflict between sources, so no figure is included. Budget roughly $30 to $60 a year including processing.
• Your actual local rate, which you must supply. Nothing in this calculator knows it.
• Whether the administrative fee is taxed, as described above.
• The 2026 administrative fee cap, which had not been published in a retrievable form and will exceed the 2025 figure of $604.47.
• Negative equity, GAP insurance, and extended warranties, unless you fold them into the vehicle price yourself.

• Using the dealer's local rate. The tax follows your registration address. A dealership in a low-rate county cannot save a buyer who lives in a high-rate city anything.
• Using a general sales tax rate as an automotive rate. They are different numbers in many Missouri jurisdictions. The DOR Motor Vehicle Sales Tax Rate Chart is the only source that gives you the right one.
• Missing the 180-day window. If you sold your old car more than 180 days before the purchase, or wait more than 180 days after, the credit is gone. It is a strict deadline and it is easy to blow through while shopping.
• Forgetting the personal property tax receipt. You will be turned away at the license office without it, and the tax on a newer vehicle is not small.
• Judging a loan by the monthly payment. Stretching this $32,009.25 balance from 60 to 72 months drops the payment to $549.58 and raises total finance charges from $6,247.05 to $7,560.16.

• Consumer Financial Protection Bureau, Truth in Lending Act (Regulation Z, 12 CFR § 1026.22) disclosure requirements for installment credit. ecfr.gov/current/title-12/chapter-X/part-1026

Also consulted: RSMo 144.020 (state sales tax rate of 4.225%); RSMo 144.440 and RSMo 144.070 (motor vehicle titling tax, sourced to the owner's address of registration); RSMo 144.025 (trade-in credit and the 180-day private replacement-vehicle credit); RSMo 301.558 and 12 CSR 10-26.231 (dealer administrative fee authorization and inflation-adjusted cap; $604.47 confirmed for 2025); Missouri Department of Revenue, Motor Vehicle Sales Tax Rate Chart (quarterly, the authoritative source for per-jurisdiction automotive rates); Missouri Department of Revenue, motor vehicle title and registration fee schedules; Experian, State of the Automotive Finance Market, Q1 2026, slide 45 (average new and used auto loan APR by VantageScore 4.0 credit tier; national, no state level cut published).

The DOR Motor Vehicle Sales Tax Rate Chart refuses automated retrieval, so no per-metro rate is published on this page. Any local rate you see quoted elsewhere for a Missouri city should be checked against that chart before you rely on it, because general retail rates and automotive rates are not interchangeable.