IFTA Frequently Asked Questions

IFTA stands for the International Fuel Tax Agreement. It is a cooperative agreement between 48 US states and 10 Canadian provinces that standardizes and simplifies fuel tax reporting for commercial motor carriers that operate across multiple jurisdictions.

Before IFTA was established in the 1980s, truckers had to obtain a fuel tax permit from every state they entered and file a separate return with each state — a major paperwork burden. IFTA replaced that system with a single quarterly return filed with the carrier's home "base state," which then distributes the appropriate tax revenue to each jurisdiction based on where miles were actually driven.

You must register for IFTA if your commercial motor vehicle meets ALL of these conditions:

• Operates in two or more IFTA jurisdictions (US states or Canadian provinces)
• AND meets at least one of the following vehicle criteria:
  • Has a gross vehicle weight or registered gross vehicle weight exceeding 26,000 lbs
  • Has three or more axles regardless of weight
  • Is used in combination with a trailer that causes the combined weight to exceed 26,000 lbs

IFTA does not apply to: recreational vehicles, vehicles operated solely within one state, government-owned vehicles, vehicles operated on trip permits, or licensed bus operations in some jurisdictions.

IFTA has 48 US member states and 10 Canadian provinces. The following are not IFTA members:

• Alaska — not contiguous
• Hawaii — island state
• Washington DC — not a state
• Yukon, Northwest Territories, Nunavut — Canadian territories (not provinces)
• Mexico — not part of IFTA

If you operate in non-IFTA jurisdictions, you may need to obtain separate fuel permits for those areas.

Your base state (also called base jurisdiction) is the IFTA member state where you register your IFTA license. To qualify as your base state, it must be the state where:

• Your qualified vehicles are registered (registered vehicle)s
• Your operational records are maintained or accessible
• Some travel occurs (your vehicles must actually operate in this jurisdiction)

You file all your IFTA quarterly returns with your base state, and your base state handles distributing tax payments to all other jurisdictions on your behalf. This is the whole benefit of IFTA — one license, one filing, regardless of how many states you drive through.

IFTA returns are filed four times per year. The deadlines for 2026 are:

• Q1 2026 (January–March): Due April 30, 2026
• Q2 2026 (April–June): Due July 31, 2026
• Q3 2026 (July–September): Due October 31, 2026
• Q4 2026 (October–December): Due January 31, 2027

If the deadline falls on a weekend or holiday, it typically moves to the next business day — but always check with your base state for confirmation.

Yes. As long as you hold an active IFTA license, you are required to file a return every quarter — even if your vehicle did not move. This is called a "zero-activity return" or "zero-mileage return."

Failing to file a zero-activity return will result in the same penalty as any other missed filing: $50 or 10% of tax due, whichever is greater. The only way to avoid this requirement is to formally cancel your IFTA license before the quarter begins.

The standard IFTA penalty is $50 OR 10% of your net tax liability — whichever amount is greater. In addition, interest accrues monthly on any unpaid tax balance.

Some states impose additional state-specific penalties on top of the IFTA standard. For example, some states charge a penalty for late payment separate from the late filing penalty. Always check your base state's IFTA program requirements.

The best strategy: file on time even if you can't pay the full amount. The late filing penalty is separate from late payment interest, and filing late makes both worse.

IFTA returns are filed directly with your base state's IFTA program — not with IFTA, Inc. or any federal agency. Most states now offer online filing through their Department of Transportation or Department of Motor Vehicles portal.

To file, you will need:

• Your IFTA license number and account information
• Total miles driven in each jurisdiction for the quarter
• Total gallons of fuel purchased in each jurisdiction
• The fuel type (diesel or gasoline)

Use our free IFTA calculator to prepare your numbers before logging into your state portal. The calculator gives you a complete breakdown by state, including tax owed or credits earned, ready to transfer to your official return.

IFTA uses an official 4-step calculation method:

• Step 1 — Fleet MPG: Total miles driven (all states) ÷ Total gallons purchased (all states) = your fleet's average fuel efficiency for the quarter.
• Step 2 — Gallons consumed per state: State miles ÷ Fleet MPG = how many gallons IFTA says you "used" in that state. This is a calculated figure, not your actual fueling in that state.
• Step 3 — Net taxable gallons: Gallons consumed (calculated) − Gallons actually purchased in that state = net taxable gallons. If positive, you owe tax. If negative, you earned a credit.
• Step 4 — Tax due or credit: Net taxable gallons × state tax rate = tax owed or credit earned per state.

All state results are totaled. If you owe more than you have in credits, you pay the net balance to your base state. If your credits exceed your debts, you receive a net refund or can apply it to the next quarter.

You receive a credit in a state when you purchased more fuel there than you consumed there (based on the calculated gallons consumed figure). This means you pre-paid more fuel tax at the pump than you actually owed based on the miles you drove in that state.

This is the fundamental mechanic of IFTA: fuel taxes follow the miles, not the fuel pump. You owe tax to the states where you drove, regardless of where you physically bought the fuel. If you fuel up in Texas (low tax: $0.20/gal) before crossing into Pennsylvania (high tax: $0.74/gal), you'll owe additional tax to Pennsylvania even though you didn't buy any fuel there.

Smart drivers use this to their advantage by strategically fueling in low-tax states before entering high-tax states.

Fleet MPG (miles per gallon) is the single fuel efficiency figure that IFTA uses for all your state-level calculations in a given quarter. It is calculated as: Total miles driven across ALL states ÷ Total gallons purchased across ALL states.

This single fleet MPG is then used to determine how many gallons you "consumed" in each individual state. Because IFTA doesn't track actual consumption per state, your fleet MPG is applied uniformly to all states.

Fleet MPG matters because it determines how much fuel IFTA says you used in each state. A higher MPG means fewer gallons consumed per state, which affects whether you owe tax or earn credits. For typical commercial diesel trucks, fleet MPG usually falls between 5.0 and 8.0 MPG.

Four IFTA jurisdictions impose a fuel tax surcharge on top of their base IFTA rate:

• Kentucky (KY): 2.0¢/gallon surcharge
• Virginia (VA): 6.5¢/gallon surcharge
• New York (NY): 0.95¢/gallon surcharge
• New Mexico (NM): 1.0¢/gallon surcharge

Surcharges are critically different from the regular IFTA tax: they are calculated on total taxable gallons consumed (not net taxable gallons), and they never generate credits. This means even if you purchased far more fuel in Virginia than you consumed there, you still owe the full 6.5¢/gal surcharge on all gallons consumed in Virginia.

Oregon is the only IFTA jurisdiction with a $0.00 diesel IFTA rate. Oregon uses a weight-mile tax system instead of a per-gallon fuel tax. Under this system, you pay based on the weight of your vehicle and how many miles you drive in Oregon — not on gallons of fuel purchased.

You still include Oregon miles on your IFTA quarterly return (with a $0.00 IFTA rate), but you must file and pay the Oregon weight-mile tax separately with the Oregon Department of Transportation (ODOT). Oregon gasoline does have an IFTA rate of $0.40/gal, so gasoline-powered vehicles are treated differently.

Kentucky: In addition to the IFTA fuel tax surcharge of 2.0¢/gal, Kentucky also requires a KYU (Kentucky Unified Carrier Registration) weight-distance tax for trucks weighing 59,999 lbs or more. The KYU tax is filed separately with the Kentucky Transportation Cabinet and is based on miles driven in Kentucky multiplied by a per-mile rate based on vehicle weight.

New York: In addition to the IFTA fuel tax surcharge of 0.95¢/gal, New York requires a Highway Use Tax (HUT) for trucks with a gross weight over 18,000 lbs. The HUT is filed separately with the New York State Department of Taxation and Finance. New York also has a separate truck mileage tax for certain types of trucks.

IFTA requires you to keep all supporting records for a minimum of 4 years from the return due date or filing date, whichever is later. Records you must keep include:

• Fuel receipts showing date, location, number of gallons, and purchase price
• Mileage records by state — GPS logs, trip sheets, or odometer readings at state line crossings
• Copies of all IFTA quarterly returns filed
• Your IFTA license and decals

Any IFTA member jurisdiction can audit your records within that 4-year window. Keep your records organized and easily accessible.

Common IFTA audit triggers include:

• Unusual MPG figures — very high or very low fleet MPG compared to typical commercial trucks (typically 5–8 MPG for diesel)
• Large credits — consistently claiming large credits from certain states
• Manual mileage estimates — using rounded or estimated figures instead of GPS or trip sheets
• Missing states — routes that logistically require passing through states that don't appear in your return
• Inconsistencies between fuel purchases shown on receipts and gallons reported on IFTA returns
• Late or amended returns

The best defense against an audit is accurate GPS mileage tracking and keeping all original fuel receipts. Electronic records are generally acceptable.

Yes. GPS-based mileage tracking is widely accepted by IFTA jurisdictions and is actually preferred over manual methods because it is more accurate and harder to dispute during an audit. Electronic logging devices (ELDs) that are already required for many commercial carriers can often generate state-by-state mileage reports suitable for IFTA.

Whatever method you use — GPS, paper trip sheets, or odometer readings at state crossings — the records must show the date, route, beginning and ending odometer readings, and miles driven per state. Make sure your GPS system stores historical data for at least 4 years.

Yes — our calculator includes all 10 IFTA Canadian provinces: Ontario, Quebec, British Columbia, Alberta, Manitoba, Saskatchewan, Nova Scotia, New Brunswick, Newfoundland, and Prince Edward Island.

Important notes for Canadian cross-border operations:

• Canadian rates are quoted in Canadian dollars per litre in official IFTA documentation, but appear in our calculator converted to US dollars per gallon for consistency
• Distance in Canada is measured in kilometres — convert to miles before entering into the calculator (1 km = 0.621371 miles)
• Currency conversion affects the accuracy of cross-border calculations — consult a tax professional for official cross-border IFTA filings

The three Canadian territories — Yukon, Northwest Territories, and Nunavut — are not IFTA members. If you operate in these territories, you will need to obtain separate fuel tax permits for those jurisdictions.

All 10 Canadian provinces (Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, Quebec, and Saskatchewan) are full IFTA members.