Montana Gas Tax
Montana’s state taxes and fees on gasoline total 33.8¢ a gallon, the 19th-highest of 51; with the 18.4¢ federal tax, drivers pay 52.2¢ a gallon in combined tax. Rates are from U.S. Energy Information Administration data as of July 2026.
What makes up Montana’s 52.2¢
| 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 | 52.2¢ |
Petroleum Storage Tank Cleanup fee : $0.0075/gal on gasoline, diesel and fuel oil, aviation gasoline, and (non-military use) jet fuel.
A 2017 increase phased in through 2023
Montana taxes gasoline at 33.0¢ a gallon, collected from distributors. The rate was 27 cents until House Bill 473, signed in May 2017, raised it in stages: to 31.5 cents on July 1, 2017, with further small steps each July until it reached 33 cents in 2023. The law set a fixed schedule; the rate is not indexed and has stayed at 33 cents since the last step.
The only other state charge is a petroleum storage tank cleanup fee of 0.75 cents a gallon, which also applies to diesel, heating oil, and aviation fuels. Montana has no general sales tax, so no sales tax is added at the pump. The EIA flags Montana as allowing local option fuel taxes, which counties can adopt on top of the state rate and which are not included in the state total.
At 33.8¢ in the EIA’s July 2026 (revised August 2026) table, Montana’s total is the 19th-highest of the 50 states and D.C. The 51-jurisdiction average is 33.8¢. Montana’s pump prices are on the Montana gas prices page.
Sources: current rates and rankings are from the EIA motor fuel tax table in our database; other facts are from the sources listed here.
Montana Beside Its Bordering States
In the EIA's July 2026 table, all 4 of Montana's bordering states list a lower state total than Montana's 33.8¢. Montana is 0.8¢ (EIA table, July 2026) above Idaho, which lists 33.0¢. It is 3.8¢ (EIA table, July 2026) above South Dakota at 30.0¢, 9.8¢ above Wyoming at 24.0¢, and 10.7¢ above North Dakota at 23.0¢. Those 4 neighbor figures come from the edition dated July 2026 and revised August 2026.
Idaho, at 33.0¢ (EIA table, July 2026), is the bordering state with the highest state total, and North Dakota, at 23.0¢, is the bordering state with the lowest. Across the 50 states and D.C. in the EIA's July 2026 table, totals run from 9.0¢ in Alaska to 73.6¢ in California. Montana's 33.8¢ (EIA table, July 2026) has 18 jurisdictions above it and 32 below it.
Montana's 33.8¢ (EIA table, July 2026) splits into 33.0¢ of excise tax and 0.8¢ of other state taxes and fees, which makes excise 98% of the state total. The 18.4¢ (EIA table, July 2026) federal tax and the 33.8¢ state total form the combined figure, and the state's portion of it is 65%. Local option taxes on gasoline apply in parts of Montana, and none of them is counted in the 33.8¢ (EIA table, July 2026) total.
How much of a gallon in Montana is tax
Montana gasoline is estimated at $4.63 a gallon. Against that, the 52.2¢ of combined state and federal tax is about 11.3% of what a driver pays — with local taxes, where they apply, on top.
Tax rate from EIA as of July 2026; pump price is this week’s US Gas Gauge estimate from EIA regional prices (EIA publishes no weekly average for Montana).
Montana vs. the other 50 states
Montana’s state gas tax of 33.8¢ is level with the 33.8¢ average across 50 states and D.C. — it is the 19th-highest.
Neighboring states' gas tax
| State | State tax | vs. Montana |
|---|---|---|
| Idaho gas tax | 33.0¢ | −0.8¢ |
| South Dakota gas tax | 30.0¢ | −3.8¢ |
| Wyoming gas tax | 24.0¢ | −9.8¢ |
| North Dakota gas tax | 23.0¢ | −10.7¢ |
Montana gas tax, answered
- What is the gas tax in Montana?
- 33.8¢ a gallon in state taxes and fees; with the 18.4¢ federal tax, 52.2¢ (EIA, July 2026).
- How does Montana's gas tax compare to other states?
- The 19th-highest of the 50 states and D.C.; the average is 33.8¢.
- 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.
- Does Montana charge local gas taxes too?
- Yes: EIA flags Montana as allowing local option taxes, which are not in the figures here.
Related to Montana gas tax
EIA, “Federal and state motor fuels taxes” (July 2026 (revised August 2026)); how these figures are built.
More Montana data
Use this data
Download: Gas tax by state, federal + state rates (CSV).
Column definitions, coverage and every file: gas price data. Free to reuse under CC BY 4.0 with credit.
Cite as: US Gas Gauge, “Montana Gas Tax,” usgasgauge.com/gas-tax/montana. Source data: U.S. Energy Information Administration.