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IFTA fuel tax rates and information for Colorado
| Diesel | $0.2050 per gallon |
| Gasoline | $0.2200 per gallon |
Rates effective as of 2025-10-01. Rates are subject to change quarterly.
Abbreviation
CO
Country
United States
Region
Mountain
Timezone
Mountain
When traveling through Colorado, you may also need to track miles in these neighboring jurisdictions:
Colorado is a member of the International Fuel Tax Agreement (IFTA). Motor carriers operating qualified vehicles in Colorado must report all miles traveled and fuel purchased in the state on their quarterly IFTA returns.
Fuel purchased in Colorado generates a tax credit at the rate of $0.2050/gallon for diesel. If you travel more miles in Colorado than the fuel you purchased would cover, you'll owe additional tax. If you purchased more fuel than you used, you'll receive a credit.
Use our free calculator to determine your tax liability for CO.