How much is Maine's gas tax?

Maine charges a state gasoline excise tax of 30.0 cents per gallon. On top of that, the federal government adds 18.4 cents per gallon, so the combined tax on regular gasoline is about 48.4 cents per gallon.

Is gas tax charged per gallon or as a percentage?

Fuel excise taxes are charged as a flat amount per gallon, not as a percentage of the price. That means the tax stays the same whether gas costs $3 or $5 a gallon, so it is a fixed cost per gallon you buy.

Does the gas tax change with the price of fuel?

No. Because Maine and the federal government use a fixed cents-per-gallon excise, the tax does not rise or fall when pump prices change. Only the underlying wholesale fuel cost and station margin move with the market.

How can I estimate my annual gas tax?

Use the per-year mode: enter your annual mileage and your vehicle's miles per gallon, and the tool divides to find the gallons you burn. It then multiplies by the combined 48.4-cent rate to estimate a full year of fuel tax.

Does this include diesel or other fuels?

This calculator uses the regular gasoline rates. Maine taxes diesel at a different per-gallon rate, and the federal diesel rate is higher too, so a diesel vehicle's tax will differ from the figures shown here.

Maine Gas Tax Calculator

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Every gallon of gasoline you buy in Maine includes a fixed state and federal tax built into the pump price. Because the tax is a flat amount per gallon, it adds up quietly over a year of driving. This calculator shows the bite per fill-up and over a full year.

How it works

Maine adds a state gasoline excise tax of 30.0 cents per gallon. The federal government adds another 18.4 cents per gallon. The combined tax is simply the number of gallons times those rates:

combined_rate = $0.300 (Maine) + $0.184 (federal) = $0.484 per gallon
per_fill_up   = gallons * combined_rate
annual_gallons = annual_miles / mpg
annual_tax    = annual_gallons * combined_rate

Because the rate is fixed per gallon, the tax does not change when pump prices rise or fall — only the fuel and margin portions do.

Example

A 14-gallon fill-up carries about 14 times 48.4 cents, or 6.78 dollars, of fuel tax. Driving 12,000 miles a year at 28 miles per gallon burns about 429 gallons, so the annual fuel tax is roughly 429 times 48.4 cents, about 208 dollars.

Notes

These figures use the regular gasoline rates. Diesel, ethanol blends, and other fuels are taxed at different per-gallon rates. Rates can change by legislation; confirm the current Maine fuel excise at maine.gov/revenue and the federal rate at the IRS before relying on the numbers.