IFTA Fuel Tax Calculator
Estimate your quarterly IFTA fuel tax liability.
IFTA tax owed = (miles per state × state tax rate ÷ MPG) − fuel taxes already paid in that state. National blended IFTA rate is about $0.32/gal in 2026.
How it works
- 1Log miles per state
Every IFTA-licensed carrier must log miles driven in each jurisdiction, usually via ELD GPS.
- 2Calculate gallons consumed per state
State miles ÷ fleet MPG = taxable gallons in that state.
- 3Apply state tax rate, subtract pump tax
If you fueled more in low-tax states than you drove, you get a refund.
Example: 25,000 quarterly miles at 6.5 MPG
| Gallons consumed | 3,846 |
| Tax due at $0.32/gal | $1,231 |
| Pump tax already paid | $1,100 |
| Net IFTA due | $131 |
Takeaway: Fueling in low-tax states (MO, OK, TX) while running high-tax states (PA, IL, IN) lowers your net IFTA bill.
Key takeaways
- Quarterly due dates: Apr 30, Jul 31, Oct 31, Jan 31.
- Late returns: $50 minimum penalty plus interest.
- Fueling strategy can save 8–12% of annual IFTA liability.
Expert tips from Bonafide dispatchers
- 1
Run an ELD with built-in IFTA reporting — manual logs trigger 60% of audits.
- 2
Buy fuel in the state where you'll burn it whenever possible.
- 3
Keep all retail receipts for 4 years — IFTA audits look back that far.
Frequently asked questions
What is IFTA?+
The International Fuel Tax Agreement consolidates fuel tax reporting for carriers operating in multiple U.S. states and Canadian provinces. One quarterly return, one payment.
When is IFTA due?+
Quarterly: April 30, July 31, October 31, and January 31. Late returns trigger a $50 minimum penalty plus interest.
Do I need IFTA for a single state?+
No. IFTA only applies if you cross state lines in a qualified motor vehicle (>26,000 lbs GVW or 3+ axles).
Last reviewed June 15, 2026 by the Bonafide Trucking Solutions dispatch team.