What is the Missouri gas tax rate?

Missouri's motor-fuel excise tax is 27 cents per gallon as of 2025 after a phased increase, applied to gasoline at the pump. Missouri also offers a refund program for tax paid on the increase, but most drivers pay the full posted rate.

Is the federal gas tax included?

Yes. The federal gasoline excise tax of 18.4 cents per gallon applies in every state, including Missouri. This calculator adds it to the Missouri state rate so you see the full per-gallon tax burden.

How much gas tax do I pay per year?

It depends on how far you drive and your fuel economy. A driver covering 12,000 miles at 25 MPG burns about 480 gallons, paying roughly $130 in Missouri state tax and $88 in federal tax per year — about $218 total.

Does gas tax apply to diesel too?

Missouri taxes diesel at the same 27-cent state rate, but the federal diesel excise is higher at 24.4 cents per gallon. This tool uses the gasoline federal rate; diesel drivers should adjust the federal figure upward.

Can I get any of the Missouri fuel tax refunded?

Missouri allows non-commercial drivers to claim a refund of the per-gallon tax increase enacted in 2021 by keeping receipts and filing with the Department of Revenue. It requires recordkeeping, so many casual drivers do not bother.

Missouri Gas Tax Calculator

Email me this result

Get this tool's output sent to your inbox, plus one useful tool a week. No spam, unsubscribe any time.

Every gallon of gasoline you buy in Missouri carries two layers of excise tax: the Missouri state motor-fuel tax and the federal gas tax. These are flat per-gallon amounts baked into the pump price, so they scale with how much you drive. This calculator shows how much of your fuel spend is pure tax — per fill-up or per year.

How it works

Excise tax is charged per gallon, not as a percentage of price, so it stays the same whether gas is cheap or expensive:

Missouri state rate = $0.27 per gallon
federal rate        = $0.184 per gallon
combined rate       = $0.454 per gallon

per fill-up tax     = tank gallons × combined rate
annual gallons      = annual miles ÷ MPG
annual tax          = annual gallons × combined rate

Example

A 14-gallon tank fill-up:

state  = 14 × 0.27  = $3.78
federal= 14 × 0.184 = $2.58
total  = $6.36 in tax per fill-up

Driving 12,000 miles a year at 25 MPG burns 480 gallons, for about $217.92 in combined fuel tax annually.

Tips and notes

The per-gallon structure means a fuel-efficient car pays far less gas tax over a year than a thirsty one driven the same distance — better MPG directly lowers your tax. Diesel drivers pay a higher federal rate (24.4 cents), so adjust upward if you run diesel. Missouri also lets non-commercial drivers reclaim part of the 2021 tax increase by saving receipts and filing a refund claim.