State gas taxes · EIA figures for July 2026
Montana gas tax
The 19th highest state gas tax of 51, and 0.0¢ below the state average. With the 18.4¢ federal tax, Montana drivers pay 52.15¢ a gallon in fuel tax, about 12% of this week's price.
What makes up the tax on a gallon
| State excise tax | 33.00¢ |
|---|---|
| Other state taxes and fees | 0.75¢ |
| Federal excise tax | 18.40¢ |
| Total per gallon | 52.15¢ |
| On a 15-gallon fill | $7.82 |
| Over a typical year (480 gallons) | $250 |
| Regular gas this week | $4.232 |
From the EIA’s notes for Montana: Petroleum Storage Tank Cleanup fee: $0.0075/gal on gasoline, diesel and fuel oil, aviation gasoline, and (non-military use) jet fuel.
Source: EIA federal and state motor fuel taxes, July 2026. The federal rate has not changed since 1993. County and city taxes are not included, so some drivers pay a little more.
Fuel tax in Montana and its neighbours
Across the line in North Dakota, state tax is 10.7¢ a gallon lower, which is $1.61 less tax on a 15-gallon fill.
| State | State tax | Versus MT | On a 15-gal tank |
|---|---|---|---|
| North Dakota | 23.0¢ | −10.7¢ | −$1.61 |
| Wyoming | 24.0¢ | −9.8¢ | −$1.46 |
| South Dakota | 30.0¢ | −3.8¢ | −$0.56 |
| Idaho | 33.0¢ | −0.8¢ | −$0.11 |
| Montana | 33.8¢ | — | — |
Where Montana sits in the ranking
| 17. West Virginia | 35.70¢ |
|---|---|
| 18. Georgia | 34.05¢ |
| 19. Montana | 33.75¢ |
| 20. Idaho | 33.00¢ |
| 21. Wisconsin | 32.90¢ |
Ranked by total state tax per gallon, highest first. See all 51 ranked.
What this means for your driving
Tax is a fixed number of cents on every gallon, so the less fuel you burn, the less of it you pay. A car that gets 30 mpg pays $209 a year in fuel tax over 12,000 miles in Montana; a pickup at 19 mpg pays $329.
Work out a trip or a year of driving with the Montana fuel cost calculator, or see Montana gas prices this week.
Montana gas tax questions
- What is the gas tax in Montana?
- Montana charges 33.75¢ per gallon of gasoline in state tax: 33.00¢ of excise tax plus 0.75¢ in other per-gallon taxes and fees, according to the EIA's table updated July 2026. Add the 18.4¢ federal tax and drivers pay 52.15¢ a gallon in fuel tax.
- How does Montana's gas tax compare with other states?
- It is the 19th highest of 51 (the 50 states and D.C.), and 0.0¢ a gallon below the average state tax of 33.8¢.
- How much gas tax does a Montana driver pay in a year?
- About $250 in state and federal fuel tax for a typical year of 480 gallons (roughly 12,000 miles at 25 mpg), of which $162 goes to the state. A 15-gallon fill carries $7.82 of tax.
- Is gas tax included in the price at the pump?
- Yes. Federal and state per-gallon fuel taxes are built into the price posted on the sign; they are not added at the register. That is why tax differences between neighbouring states show up directly in pump prices.
- Which neighbouring state has a lower gas tax than Montana?
- North Dakota has the lowest state gas tax of Montana's neighbours, at 23.03¢ a gallon. That is 10.7¢ less, or $1.61 on a 15-gallon fill.