Fuel Tax Calculator

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Fuel Tax Calculator (IFTA)

Miles Driven in State 1,000 miles
Gallons Purchased in State 150 gallons
State Tax Rate $0.25/gallon

Fuel Tax Calculation Results

$37.50
Miles Driven 1,000 miles
Gallons Purchased 150 gallons
State Tax Rate $0.25/gal
Tax Due to State $37.50
Fuel Efficiency
6.67 MPG
Miles per gallon for this trip

IFTA Tax Formulas & Notes

IFTA Fuel Tax Calculation Formula

Tax Due = Gallons Purchased × Tax Rate

Tax Due = Amount of fuel tax owed to the state

Gallons Purchased = Total gallons of fuel purchased in the state

Tax Rate = State’s fuel tax rate per gallon

IFTA Reporting: The International Fuel Tax Agreement requires quarterly reporting of miles traveled and fuel purchased in each jurisdiction.

Net Tax Calculation: Actual IFTA calculations compare fuel used (miles ÷ MPG) vs fuel purchased in each state. This simplified calculator uses purchased gallons for basic estimates.

Frequently Asked Questions

What is IFTA and who needs to file?

IFTA (International Fuel Tax Agreement) is an agreement among US states and Canadian provinces to simplify the reporting of fuel taxes by interstate carriers.

Who must file IFTA:

  • Commercial vehicles with 3 or more axles
  • Vehicles weighing 26,001+ pounds
  • Vehicles with a combined weight of 26,001+ pounds
  • Vehicles traveling in at least 2 IFTA jurisdictions

Quarterly returns are required even if no miles were traveled during the quarter.

How is actual IFTA tax calculated vs this calculator?

This calculator provides a simplified version for quick estimates. Actual IFTA calculations involve:

  • Fuel Used Calculation: (Total miles in jurisdiction ÷ Total MPG) × Tax rate
  • Fuel Purchased Tracking: Actual gallons purchased in each jurisdiction
  • Net Tax Due: Tax on fuel used minus tax already paid through purchases

Example: If you used 200 gallons in State A (based on mileage) but only purchased 150 gallons there, you would owe tax on the 50-gallon difference.

What records do I need for IFTA filing?

Proper record-keeping is essential for accurate IFTA filing:

  • Distance Records: Mileage by jurisdiction (odometer readings, trip sheets, GPS data)
  • Fuel Receipts: All fuel purchase receipts showing gallons, price, date, location
  • Vehicle Information: Unit numbers, vehicle identification numbers
  • Quarterly Summaries: Total miles and gallons by jurisdiction

Records must be maintained for 4 years and be available for audit at all times.

What are the penalties for late IFTA filing?

IFTA penalties can be significant and include:

  • Late Filing Fee: $50 or 10% of net tax due (whichever is greater)
  • Interest Charges: Prime rate plus 6% on overdue taxes
  • Audit Assessments: Additional taxes if discrepancies are found
  • License Suspension: Possible suspension of IFTA license for repeated violations

Important Dates: Returns are due on the last day of the month following each quarter (April 30, July 31, October 31, January 31).

How do state tax rates vary across the US?

State fuel tax rates vary significantly across the United States:

  • Highest Rates: Pennsylvania ($0.576/gal), California ($0.539/gal), Washington ($0.494/gal)
  • Lowest Rates: Alaska ($0.089/gal), Missouri ($0.173/gal), Mississippi ($0.184/gal)
  • National Average: Approximately $0.25-$0.30 per gallon

Rates change frequently as states adjust for infrastructure needs. Always verify current rates with state tax authorities before filing.

Some states also have additional local taxes, environmental fees, or inspection fees that increase the total tax burden.

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