How much is the gas tax in Mississippi?

Mississippi levies a per-gallon state excise tax on gasoline, historically one of the lowest in the nation. On top of that, the federal government charges 18.4 cents per gallon, so your combined per-gallon tax is the sum of both rates this tool shows.

Is Mississippi's gas tax going up?

Mississippi has long had a low fixed per-gallon rate, but recent legislation phases in increases to fund road work. Because the exact rate changes over the phase-in, this calculator lets you edit the state rate so you can match the current figure.

Does the gas tax depend on the price of gas?

No. Both the Mississippi and federal gas taxes are flat per-gallon excise taxes, not a percentage of price. You pay the same cents-per-gallon whether gas is cheap or expensive, so a price spike does not change the tax portion.

How do I find my gas tax per mile?

Divide the combined per-gallon tax by your miles per gallon. A more efficient car spreads the same per-gallon tax over more miles, so its tax per mile is lower. This calculator computes that figure automatically from your MPG.

Does this include sales tax on fuel?

This tool models the per-gallon excise taxes (state plus federal), which are the main fuel taxes in Mississippi. It does not add general sales tax, as motor fuel is handled through the excise system rather than ordinary sales tax in most cases.

Mississippi Gas Tax Calculator

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Mississippi charges a flat per-gallon excise tax on gasoline, and the federal government adds 18.4 cents per gallon on top. Because these are cents-per-gallon taxes (not a percentage of price), your total depends on how many gallons you buy. This tool turns your mileage and fuel economy into a per-fill-up, monthly, and annual tax figure.

How it works

Gallons used come from your mileage and MPG, and the tax is the combined per-gallon rate times gallons:

gallons/year   = annual miles / MPG
combined rate  = state cents + federal cents (per gallon)
annual tax     = gallons/year x combined rate
tax per mile   = combined rate / MPG
tax per fillup = tank size x combined rate

Both rates are flat excise taxes, so a higher pump price does not increase the tax portion — only buying more gallons does. A more fuel-efficient car lowers your tax per mile because the same per-gallon tax is spread over more miles.

Example and notes

Driving 12,000 miles a year at 25 MPG uses 12,000 / 25 = 480 gallons. With a combined rate near 37 cents per gallon, the annual tax is about 480 x 0.37 = 177.60 dollars, and the tax per mile is 0.37 / 25 = 0.0148 dollars (about 1.5 cents). Mississippi’s state rate is being adjusted by recent legislation, so edit the state-rate field to match the current per-gallon figure for the most accurate result.