Maine Gas Tax Calculator

Maine's state gasoline tax is 31.4¢ per gallon (all fees included; excise-only is 30.0¢) and the diesel tax is 31.9¢ per gallon (excise-only: 31.2¢). Combined with the federal 18.4¢/gal gasoline excise and 0.1¢/gal LUST fee, drivers in Maine pay a total of 49.9¢ per gallon of gasoline in state and federal taxes.

On a 15-gallon fill-up with gasoline in Maine, you pay approximately $4.71 in state taxes (all fees) plus $2.77 in federal tax — a combined total of $7.49 in taxes per fill-up. Use the calculator above to adjust for your tank size.

Maine's gasoline excise tax is 30.0¢/gal — this is the pure statutory per-gallon tax set by the state legislature. The combined rate of 31.4¢/gal includes the excise plus additional state-level fees such as environmental surcharges, petroleum storage tank fees, or sales tax components. The combined rate is what drivers effectively pay per gallon.

The federal gasoline excise tax is 18.4 cents per gallon and has been unchanged since October 1, 1993. The federal diesel excise tax is 24.4 cents per gallon. An additional 0.1 cent per gallon Leaking Underground Storage Tank (LUST) fee also applies to both fuels, bringing the combined federal rate to 18.5 c/gal (gasoline) and 24.5 c/gal (diesel). These taxes fund the Highway Trust Fund for interstate highway maintenance and mass transit.

The excise rate is the pure statutory per-gallon excise tax set by the state legislature. The combined rate is the total state-level tax burden per gallon as compiled by the EIA, including the excise tax plus environmental fees, petroleum storage tank fees, inspection fees, and in some states an applicable sales tax on fuel. For most states the difference is small (under 2 c/gal), but states like California, Indiana, Illinois, Vermont, and Washington D.C. show significant gaps because they layer sales taxes or large surcharges on top of the excise.

California has the highest combined state gas tax at 70.9 cents per gallon as of January 1, 2026, per the EIA. This includes the excise tax plus the 2.25% sales tax on gasoline. California also has the highest combined diesel tax at 87.3 c/gal. Illinois (66.4 c/gal gasoline) and Washington (59.04 c/gal) rank second and third.