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IFTA fuel tax rates and information for Connecticut
| Diesel | $0.4615 per gallon |
| Gasoline | $0.2500 per gallon |
Rates effective as of 2025-10-01. Rates are subject to change quarterly.
Abbreviation
CT
Country
United States
Region
Northeast
Timezone
Eastern
When traveling through Connecticut, you may also need to track miles in these neighboring jurisdictions:
Connecticut is a member of the International Fuel Tax Agreement (IFTA). Motor carriers operating qualified vehicles in Connecticut must report all miles traveled and fuel purchased in the state on their quarterly IFTA returns.
Fuel purchased in Connecticut generates a tax credit at the rate of $0.4615/gallon for diesel. If you travel more miles in Connecticut 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 CT.