Montana Gas Tax
What Montana and the federal government charge per gallon of gasoline, from U.S. Energy Information Administration data as of July 2026.
What makes up Montana’s 52.1¢
| Montana state excise tax | 33.0¢ |
| Other Montana taxes & fees sales/use taxes, inspection and environmental fees | 0.8¢ |
| Total Montana state tax | 33.8¢ |
| Federal excise + LUST fee 18.3¢ excise + 0.1¢ LUST, unchanged since 1993 | 18.4¢ |
| Combined state + federal | 52.1¢ |
Petroleum Storage Tank Cleanup fee : $0.0075/gal on gasoline, diesel and fuel oil, aviation gasoline, and (non-military use) jet fuel.
How much of a gallon in Montana is tax
Montana gasoline currently averages $4.66 a gallon. Against that, the 52.1¢ of combined state and federal tax is about 11.2% of what a driver pays — with local taxes, where they apply, on top.
Tax rate from EIA as of July 2026; pump price is the current EIA weekly average. The two are published on different schedules, so the share moves as prices move even when the tax does not.
Montana vs. the other 50 states
Montana’s state gas tax of 33.8¢ is 0.0¢ below the 33.8¢ average across 50 states and D.C. — the 19th-highest, or equivalently the 33rd-lowest.
Montana gas tax, answered
- What is the gas tax in Montana?
- Montana charges 33.8¢ per gallon in state gasoline taxes — 33.0¢ of state excise tax plus 0.8¢ in other state taxes and fees. Adding the 18.4¢ federal tax brings the total to 52.1¢ per gallon, according to U.S. Energy Information Administration data as of July 2026. These are state and federal taxes only and exclude county and local taxes.
- How does Montana's gas tax compare to other states?
- Montana's state gasoline tax of 33.8¢ per gallon ranks 19th-highest of the 50 states and D.C. that EIA lists, against an average of 33.8¢. The highest is California at 73.6¢ and the lowest is Alaska at 8.9¢.
- What is the federal gas tax in Montana?
- The federal gasoline tax is 18.4¢ per gallon in Montana, the same as in every other state — 18.3¢ of excise tax plus a 0.1¢ Leaking Underground Storage Tank fee. It has been unchanged since 1993.
- How much of the price of gas in Montana is tax?
- With Montana gasoline averaging $4.66 per gallon, the 52.1¢ of combined state and federal tax is about 11.2% of the pump price. Local taxes, where they apply, are on top of that.
- Does Montana charge local gas taxes too?
- Yes — EIA flags Montana as a state where local option taxes are allowed, so some counties and cities add their own tax on top of the 33.8¢ state rate. EIA's table covers state taxes of general application and excludes county and local taxes, so a driver in some Montana cities pays more than the figure shown here.
Related to Montana gas tax
Tax rates from the U.S. Energy Information Administration, “Federal and state motor fuels taxes”, edition July 2026 (revised August 2026) (as of July 2026), published on EIA’s Petroleum Marketing Monthly page and reissued each January and July. EIA lists taxes “of general application … exclusive of county and local taxes”; rates are for gasoline.