How much is Maryland's gas tax?

For the period beginning July 1, 2024, Maryland's gasoline excise tax is 47.1 cents per gallon and its diesel tax is 47.75 cents per gallon. The rate is indexed to inflation and adjusts every July 1, so it changes annually.

Does this include the federal gas tax?

Yes. The tool adds the federal excise tax of 18.4 cents per gallon for gasoline (24.4 cents for diesel) to the Maryland rate, giving a combined gasoline tax of about 65.5 cents per gallon that you pay at the pump.

How is the per-mile cost found?

In annual mode the tool divides your yearly mileage by your vehicle's MPG to find gallons burned, applies the combined tax rate, and then divides the total tax by miles. A 28-MPG car driven 12,000 miles burns about 429 gallons.

Why does Maryland's gas tax change every year?

Maryland indexes its motor fuel tax to inflation, so the Comptroller recalculates the per-gallon rate each July 1 based on the Consumer Price Index. This keeps real revenue stable but means the cents-per-gallon figure drifts upward over time.

Is sales tax charged on gasoline too?

No. Maryland's fuel tax is a per-gallon excise, and motor fuel is generally exempt from the state's general sales tax. The figures here are excise only, which is the tax actually built into the pump price.

Maryland Gas Tax Calculator

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Every gallon you pump in Maryland carries both a state and a federal excise tax baked into the price. This calculator separates those two layers and converts them into a cost per fill-up or — using your mileage and fuel economy — a cost per mile driven, so you can see exactly how much of your fuel spend is tax.

How it works

The tax is a flat amount per gallon, so the only question is how many gallons:

gallons (fill-up) = gallons you entered
gallons (annual)  = annual miles ÷ MPG
Maryland excise   = gallons × $0.471 (gas) or $0.4775 (diesel)
federal excise    = gallons × $0.184 (gas) or $0.244 (diesel)
total tax         = Maryland + federal
per mile          = total tax ÷ annual miles   (annual mode)

Because the tax is per gallon, a more efficient car pays less total fuel tax for the same distance — fuel economy directly lowers your tax-per-mile.

Example and notes

A 28-MPG car driven 12,000 miles a year burns roughly 429 gallons. At the combined 65.5 cents-per-gallon gasoline rate that’s about $281 in fuel tax for the year, or just over 2.3 cents per mile. Maryland’s rate resets each July 1 with inflation, so update the figure annually. These are excise taxes only and exclude any general sales tax; verify current rates with the Maryland Comptroller.