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United States · MT
Montana
IFTA fuel tax rates, jurisdiction details, and neighboring states for Montana.
Current tax rates
Diesel
$0.2975/gal
Gasoline
$0.3300/gal
Effective 2026-04-01. Per gallon, USD.
Jurisdiction
Code
MT
Country
United States
Region
Mountain
Timezone
Mountain
Neighboring jurisdictions
Trips through Montana commonly cross into these. Check their rates if you log miles there too.
IFTA in Montana
Montana is a member of the International Fuel Tax Agreement. Carriers operating qualified vehicles in Montana report all miles traveled and fuel purchased in the state on their quarterly IFTA returns.
Fuel purchased in Montana generates a tax credit at the rate of $0.2975/gal/gal for diesel. If you put more miles on the road in Montana than the fuel you purchased there would cover, you owe additional tax. If you purchased more fuel than you used, you receive a credit.
Calculate MT