New Hampshire IFTA Tax Rate — 2026

How New Hampshire IFTA tax is calculated

For every gallon of diesel your truck "burned" inside New Hampshire during the quarter, you owe $0.2220 in IFTA tax. The number of taxable gallons isn't the gallons you bought there — it's the miles you drove inside New Hampshire divided by your fleet's average miles-per-gallon for the whole quarter.

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

Common New Hampshire IFTA filing questions

• Do I file IFTA in New Hampshire if my home base is here? If your IFTA base jurisdiction is New Hampshire, you file your quarterly return with the New Hampshire Department of Revenue (or equivalent). Your filing covers every IFTA jurisdiction you ran in, not just New Hampshire.
• What if I only drove a few miles through New Hampshire? 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) New Hampshire's share whether you bought fuel here or not.
• What if New Hampshire fuel is cheaper than the IFTA tax? The IFTA rate above is what you owe per gallon "consumed" in New Hampshire. The pump price already includes New Hampshire'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 New Hampshire, you'll owe the full New Hampshire rate on those gallons at filing time.

New Hampshire IFTA filing deadlines

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

• 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.