IFTA Tax Guide for Commercial Truckers

IFTA — the International Fuel Tax Agreement — requires carriers that run qualified motor vehicles in two or more member jurisdictions to hold one IFTA license, display two decals on each truck, and file a quarterly fuel tax return with their base jurisdiction. The return allocates fuel tax to each state and province by the miles driven there, credits the tax already paid at the pump, and produces one net payment or credit.

This guide covers who must file, registration, the calculation, recordkeeping, audits, and the taxes IFTA doesn't cover. The rules come from IFTA's Articles of Agreement and Procedures Manual, both revised August 26, 2026. To run your own numbers, use the IFTA fuel tax calculator.

Who must file IFTA?

A vehicle is a qualified motor vehicle under IFTA rule R245 if it is used, designed, or maintained to transport people or property and meets any one of these tests:

1. Two axles and a gross vehicle weight or registered gross vehicle weight over 26,000 lbs (11,797 kg);
2. Three or more axles, regardless of weight; or
3. Used in combination, when the combined weight exceeds 26,000 lbs.

Recreational vehicles — motor homes, pickups with campers, and buses used only for personal pleasure with no business use — are excluded.

You need an IFTA license if you operate a qualified vehicle in two or more member jurisdictions. A truck that never leaves its home state reports fuel tax to that state under its own rules instead. A carrier that crosses state lines only occasionally can buy a trip permit from each state instead of an IFTA license, but that's rarely cheaper for regular interstate work.

Member jurisdictions

IFTA has 58 members: the 48 contiguous U.S. states and 10 Canadian provinces. Alaska, Hawaii, the District of Columbia, and Canada's Yukon, Northwest Territories, and Nunavut are not members. Miles and fuel in those places still go into your fleet totals, but no IFTA tax is computed for them.

Registering: base jurisdiction, license, decals

Your base jurisdiction is the member state or province where your qualified vehicles are based for registration, where you keep or can make available your operational records, and where some of your vehicles' travel occurs. For most carriers it's the home state.

Apply through that state's IFTA office (often the revenue department or DMV). You'll receive:

• One license for the carrier, valid for the calendar year (January 1 – December 31). Keep a copy in each vehicle.
• Two decals per qualified vehicle, displayed on the exterior of both sides of the cab.

Decal fees are set by each base jurisdiction:

Renewals. New-year credentials can be displayed up to two months early, and members give renewing carriers a grace period through the end of February to switch decals. A 30-day temporary decal permit covers a newly added truck while permanent decals are on the way.

How the quarterly calculation works

1. Total all miles and all fuel for the fleet (by fuel type), including non-member areas and bulk fuel.
2. Fleet MPG = total miles ÷ total gallons.
3. Taxable gallons in each jurisdiction = jurisdiction miles ÷ fleet MPG.
4. Tax due = taxable gallons × that quarter's rate.
5. Tax-paid credit = gallons bought at retail in that jurisdiction × the same rate.
6. Net = tax due − tax-paid credit, then add all jurisdictions together.

Worked example: a Midwest lane

A carrier runs 25,000 miles in a quarter and buys 4,000 gallons of diesel, for a fleet MPG of 6.25. Rates are from the 3Q 2026 IFTA tax rate matrix.

The carrier pays $223.20 with the return. The lesson: total fuel tax ($2,503.20) is set by where you drove. Fueling in Indiana instead of Pennsylvania changes how much you prepay at the pump and how big the balance is on the return, not the total tax.

Surcharges

Kentucky ($0.105) and Virginia ($0.143) add a diesel surcharge on top of their regular rate. It's charged on taxable gallons through the IFTA return, with no credit for fuel bought in those states.

Rates change — use the right quarter's matrix

IFTA, Inc. publishes a rate matrix for every quarter. Over the four quarters ending in 3Q 2026, the diesel rate changed at least once in California, Florida, Georgia, Illinois, Indiana, Michigan, Mississippi, New York, Virginia, and Washington. Current examples (3Q 2026):

The 4Q 2026 matrix is posted but remains subject to change until December 4, 2026.

Due dates

Quarterly returns are due the last day of the month after the quarter ends, and you must file even if you had no operations. When the due date falls on a weekend or legal holiday, it moves to the next business day:

Carriers with fewer than 5,000 miles (8,000 km) outside the base jurisdiction can ask for annual filing, due January 31.

Penalties and interest

• Penalty: the greater of $50 or 10% of delinquent tax, for late filing, failure to file, or underpayment (R1220).
• Interest: for U.S. carriers, the IRS underpayment rate plus 2 percentage points, reset each January 1 and accrued monthly. The 2026 rate is 9% a year, or 0.75% a month (IFTA interest rate page).
• Revocation: repeated failures to file or pay can lead your base jurisdiction to revoke the license, which means trip permits in every state until you're reinstated.

Example. A return showing $1,800 of net tax is filed and paid three months late. Penalty = greater of $50 or 10% × $1,800 = $180. Interest = $1,800 × 0.75% × 3 months = $40.50. Total cost of the delay: $220.50.

Records you must keep

Keep records for four years from the return's due date or filing date, whichever is later. Distance records for each trip must show:

• Trip start and end dates
• Origin and destination, and the route
• Beginning and ending odometer, hubodometer, or ECM readings
• Total trip distance and distance in each jurisdiction
• Vehicle unit number or VIN

Fuel records must show the date, seller's name and address, gallons, fuel type, price, and the vehicle unit number, so each purchase can be tied to a truck. Bulk-tank fuel needs withdrawal records by vehicle. Electronic logging and GPS data are acceptable if they capture the required elements; a GPS file that only shows state-line crossings without odometer or ECM readings may not be enough.

Audits

Base jurisdictions audit an average of 3% of their IFTA accounts per year, and one audit covers all member jurisdictions. When records are inadequate, auditors can, for the vehicles involved, reduce your MPG by 20% or assign 4.00 MPG. On 25,000 miles, 4.00 MPG means 6,250 taxable gallons instead of 4,000 — and every one of the extra 2,250 gallons is taxed somewhere with no matching tax-paid credit.

Taxes IFTA does not cover

• Oregon weight-mile tax. Oregon taxes heavy trucks on declared weight and miles rather than through a diesel rate; you file a separate Oregon mileage tax report in addition to IFTA.
• Kentucky KYU. Trucks with a combined license weight over 59,999 lbs pay $0.0285 per mile in Kentucky (Kentucky Transportation Cabinet).
• New Mexico Weight Distance Tax. Applies to vehicles over 26,000 lbs on New Mexico highways (New Mexico Taxation and Revenue).
• New York Highway Use Tax. A separate New York permit and return for heavy vehicles.
• Federal diesel excise tax of 24.4 cents per gallon, included in pump prices (IRS Publication 510).
• Heavy Highway Vehicle Use Tax (Form 2290) for vehicles with a taxable gross weight of 55,000 lbs or more. The July 1, 2026 – June 30, 2027 period was due August 31, 2026 for trucks in use in July, and the full-period tax for an 80,000-lb truck is $550 (Form 2290 instructions).

IFTA and your income taxes

For an owner-operator, fuel — including the fuel taxes paid at the pump and on the IFTA return — is a deductible business expense on Schedule C, and IFTA license and decal fees are deductible too. A tractor unit used over the road is 3-year MACRS property, and one acquired after January 19, 2025 can generally be written off in full with 100% bonus depreciation; the MACRS depreciation guide explains the options. Because nobody withholds income tax from a settlement check, owner-operators also need to make quarterly estimated tax payments on their net profit.

A quarter-end checklist

1. Reconcile trip records to total miles by truck.
2. Reconcile fuel receipts and fuel card statements to total gallons by truck and fuel type.
3. Check fleet MPG against prior quarters; investigate big swings.
4. Download the matrix for the quarter you're filing.
5. Compute tax due, credits, and surcharges — the IFTA fuel tax calculator handles the per-jurisdiction math.
6. File and pay by the due date, and save the return with the supporting records for four years.