IFTA Calculator
No surprises at quarter end.
IFTA splits your fuel tax among states based on miles driven in each. Enter your quarter totals, then the miles, gallons bought, and tax rate for one state. Repeat for each state you ran.
Net tax due
$65.33
Fleet MPG
6.52
Taxable gallons
1,226.7
Tax owed / tax paid
$245.33 / $180.00
How to Use It
- Total your quarter's miles and fuel gallons across all jurisdictions.
- Enter the miles driven and gallons purchased in one state.
- Enter that state's current IFTA diesel rate from iftach.org.
- Repeat for every state and add up the results for your return.
The Formula
MPG = Total miles ÷ Total gallons | Taxable gal = State miles ÷ MPG | Net = (Taxable − Purchased) × Rate
Frequently Asked Questions
How is IFTA calculated?
Your fleet MPG is calculated for the quarter. Miles in each state ÷ MPG gives taxable gallons. You owe that state's rate on taxable gallons, minus tax already paid at the pump there.
When is IFTA due?
Quarterly: April 30, July 31, October 31, and January 31.
Where do I find IFTA tax rates?
Current rates are published each quarter by the IFTA clearinghouse at iftach.org. This calculator is an estimate — always file using official rates.
Let Our Desk Run the Numbers for You
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Results are estimates for planning only and are not tax, legal, or financial advice.