Indiana IFTA Tax Rate — 2026

How Indiana IFTA tax is calculated

For every gallon of diesel your truck "burned" inside Indiana during the quarter, you owe $0.6300 in IFTA tax. The number of taxable gallons isn't the gallons you bought there — it's the miles you drove inside Indiana divided by your fleet's average miles-per-gallon for the whole quarter.

Your IFTA return then nets that against the Indiana fuel-tax you already paid at the pump on gallons purchased inside the state. If you ran more Indiana miles than you bought Indiana fuel, you owe the difference. If you bought more Indiana fuel than you ran Indiana miles, you get a refund or credit.

Indiana-specific notes

Indiana's published IFTA rate already includes the state's surcharge. When iftach.org publishes a separate surcharge column for Indiana, MyCarrierVault folds it into the base rate so the number you see here is the total per-gallon you owe.

Common Indiana IFTA filing questions

• Do I file IFTA in Indiana if my home base is here? If your IFTA base jurisdiction is Indiana, you file your quarterly return with the Indiana Department of Revenue (or equivalent). Your filing covers every IFTA jurisdiction you ran in, not just Indiana.
• What if I only drove a few miles through Indiana? Every IFTA mile counts, even if you only crossed the state. Track them on your trip sheet or ELD report — you'll owe (or get refunded) Indiana's share whether you bought fuel here or not.
• What if Indiana fuel is cheaper than the IFTA tax? The IFTA rate above is what you owe per gallon "consumed" in Indiana. The pump price already includes Indiana's state fuel tax — that's what gets credited on your return. If you bought all your fuel in a low-tax state and drove all your miles in Indiana, you'll owe the full Indiana rate on those gallons at filing time.

Indiana IFTA filing deadlines

IFTA returns are due quarterly across all 48 contiguous U.S. states, including Indiana:

• Q1 (Jan–Mar): due April 30
• Q2 (Apr–Jun): due July 31
• Q3 (Jul–Sep): due October 31
• Q4 (Oct–Dec): due January 31

Late filings collect penalties even if you owe nothing — some states charge $50 minimum per late return. File on time even if your net due is $0.