Track down exactly what you owe across state lines with the Fuel Tax Calculator — enter your Base Jurisdiction, Fuel Type, Tax Quarter, and then add each state's Miles Traveled and Fuel Purchased to calculate your Total IFTA Tax Owed, along with your Average MPG, Weighted Average Tax Rate, and combined trip totals.
Total IFTA Tax Owed
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Total Miles Traveled
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Total Fuel Purchased
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Average MPG
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Weighted Average Tax Rate
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You'll need your base jurisdiction, fuel type, tax quarter, and for each state: miles traveled and gallons of fuel purchased. Make sure to have accurate records of your trips and fuel purchases.
Base Jurisdiction is the state where your motor carrier business is registered and where you file your IFTA returns. This is typically where your business is headquartered or where you maintain your principal place of business.
Commercial motor vehicle operators with vehicles that have a gross vehicle weight of 26,001+ pounds or have 3+ axles (regardless of weight), and travel interstate must file IFTA returns if they're based in IFTA member jurisdictions.
An IFTA qualified vehicle is a motor vehicle used or intended for commercial purposes with either two axles and a gross vehicle weight exceeding 26,000 pounds, or three or more axles regardless of weight.
IFTA returns are filed quarterly. Q1 is due April 30, Q2 is due July 31, Q3 is due October 31, and Q4 is due January 31 of the following year.
Each state sets its own fuel tax rate per gallon. Diesel and gasoline typically have different rates. The calculator uses current state tax rates to compute your total tax liability.
This calculator supports up to two states for simplicity. For more complex multi-state trips, consider using specialized trucking software or adding states one calculation at a time.
If you purchased more fuel in a state than you consumed (based on miles traveled), you may receive a credit on that portion. The net calculation across all states determines your total tax owed or refund due.