IFTA vs IRP: Fuel Tax vs Registration

Part of Authority, Registration & Taxes

IFTA and IRP get filed together, renewed in the same office, and often confused. The difference between them is simple. IFTA settles the fuel tax you owe each state for fuel burned there. IRP settles the registration fee you owe each state for running there. Both are agreements among the US states and Canadian provinces, not federal rules. Most interstate trucks need both.

Neither one is your USDOT number or your operating authority. Those are federal registrations, kept alive by the 24-month update. IFTA and IRP are state paperwork that runs beside them.

Settles fuel tax
IFTA, quarterly
Settles plate fees
IRP, yearly
Heavy truck crossing state lines
Both
Low-poly render of a blank sign gantry at a state line
A sign gantry at a state line. IFTA and IRP both exist because a truck crosses one.

IFTA and IRP side by side

CriterionIFTAIRP
What it settlesFuel use taxRegistration (licence-plate) fees
Money is divided byFuel burned in each jurisdiction, from miles and fleet MPGShare of fleet distance run in each jurisdiction
Qualifying vehicleTwo axles over 26,000 lb, 3+ axles, or a combination over 26,000 lbThe same three tests, applied to the power unit
Under the thresholdOutside the agreementMay register under the Plan by choice
Filing rhythmA return every quarterOne registration every 12 months
Credential on the truckLicence copy in the cab, 2 decals outsideApportioned plate and cab card
Credential runsCalendar year, to Dec 31The base jurisdiction's registration year
Records kept for4 years from the return3 years after the registration year
Needs fuel receiptsYes, for every tax-paid gallonNo
Instead of joiningFuel trip permitsTrip permits, state by state

Read down the first two rows and the rest follows. IFTA is a tax on fuel, so it needs fuel receipts and settles every quarter. IRP is a registration fee, so it settles once a year and puts a plate on the truck. Both run on the same mileage records.

One weight line, two slightly different tests

Both agreements draw the line in the same place: two axles and more than 26,000 lb gross or registered weight, or 3 or more axles at any weight, or a combination over 26,000 lb. Recreational vehicles are out of both. The wording around that line differs in three places that matter.

  • 01IRP registers the power unit. Trailers are not apportioned under the Plan except by an approved exception. IFTA counts the whole combination's weight but licenses the carrier, not a plate.
  • 02IRP lets a lighter truck in. A power unit at or under the line may still be registered under the Plan at the registrant's option. IFTA has no such door; a light truck simply pays fuel tax at the pump like a car.
  • 03Both offer a trip-by-trip route instead. IFTA allows fuel trip permits in lieu of a licence, and IRP members issue registration trip permits. For a truck that crosses a line twice a year that can be cheaper; for one that crosses weekly it rarely is.

IFTA: four returns a year

IFTA settles fuel tax between the states and provinces. You file one return per quarter in your base jurisdiction, and the return is due on the last day of the month after the quarter closes. If that day falls on a weekend or holiday, the next business day counts.

QuarterCoversReturn due
Q1Jan 1 - Mar 31Apr 30
Q2Apr 1 - Jun 30Jul 31
Q3Jul 1 - Sep 30Oct 31
Q4Oct 1 - Dec 31Jan 31

The credential is a licence for the carrier plus 2 decals per qualified truck, one on each exterior side of the cab. A copy of the licence, paper or an electronic image, rides in every truck. The licence runs to December 31; renewal decals can go on in the 2-month grace of January and February.

A late or missing return can draw a penalty of $50 or 10% of the delinquent tax, whichever is greater, plus interest. That applies to a zero quarter too. The arithmetic of a return is in the IFTA fuel tax guide.

IRP: one registration a year

IRP settles registration fees. Each member jurisdiction's fee for full registration of your fleet is multiplied by your share of distance there, and you pay the sum once per 12-month registration year to your base jurisdiction. The distance comes from a fixed window: the twelve months before July 1 of the year before the registration year starts. A March 2027 renewal is priced on miles run from July 1, 2025 to June 30, 2026.

What you get is a plate and a cab card. The cab card has to show:

  • Every member jurisdiction, with the weight or combined axles registered in each
  • Registration, issue or effective date
  • Expiration date (and the enforcement date if a grace period applies)
  • Model year, make and VIN
  • Plate number and equipment number
  • Registrant's name and address, and the fleet account number

The fee mechanics and the first-year estimate are covered in IRP apportioned plates.

Base jurisdiction and records

IFTA defines your base as the jurisdiction where the trucks are based for registration, where operational records are kept, and where the fleet runs some miles. In practice that ties it to your IRP base. IRP is stricter about the office: an established place of business in the base state means a building you own or lease for at least 12 months, with signage, posted hours, and permanent staff there at least 20 hours a week. A mail drop does not qualify.

The records are the good news. IFTA's Procedures Manual and the Plan list the same seven elements for a trip record kept by hand:

  • 01Beginning and ending dates of the trip
  • 02Origin and destination
  • 03Route of travel
  • 04Beginning and ending odometer, hubodometer or ECM reading
  • 05Total distance of the trip
  • 06Distance travelled in each jurisdiction
  • 07VIN or vehicle unit number

GPS records are accepted too. The Plan wants a position at least every 15 minutes while the engine runs. On top of the trip records, IFTA needs a receipt for every gallon you claim as tax-paid. Keep IFTA records 4 years from the later of the return's due date or filing date. Keep IRP records 3 years after the registration year closes. The simple rule is to keep everything for the longer period.

Setting up both without doing the work twice

  • Pick one base state that meets both tests: a real staffed office, records kept there, and trucks that run miles there.
  • Apply for IRP first. The plate and cab card are what the IFTA definition of a base keys on.
  • Set up one trip record per truck that captures all seven elements, or a GPS log that meets the 15-minute rule.
  • File fuel receipts by quarter and by purchase state from day one. IRP never asks for them, IFTA always does.
  • Put the four IFTA due dates and the IRP renewal month in the same calendar.
  • Before running a new state, check the cab card lists it. If it does not, add the jurisdiction to your registration or buy a trip permit first.

Want to see what a quarter costs before you file? The IFTA calculator runs the return from your miles and gallons. Plates, fuel-tax setup and the UCR fee all belong in a new carrier's startup budget.

Sources

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