IRP vs IFTA: apportioned plates and fuel tax are two different things

The International Registration Plan is a registration reciprocity agreement among U.S. states and Canadian provinces. Its "fundamental principle," per IRP Plan § 105, is "to promote and encourage the fullest possible use of the highway system by authorizing apportioned registration of Fleets of Apportionable Vehicles and the recognition by each Member Jurisdiction of the registration of Vehicles apportioned by other Member Jurisdictions." § 110 states the mechanism in one sentence: "It is the purpose of the Plan to implement the concept of one registration Plate for one Vehicle."

Federal law backs it. 49 U.S.C. 31704 provides that a state not participating in the Plan "may not establish, maintain, or enforce a commercial motor vehicle registration law, regulation, or agreement that limits the operation in that State of a commercial motor vehicle that is not registered under the laws of the State, if the vehicle is registered under the laws of a State participating in the Plan."

What you get. Under § 600(a), "Upon the registration of an Apportionable Vehicle under the Plan, the Base Jurisdiction shall issue a Cab Card and a Plate for the Vehicle, and these shall be the sole registration Credentials issued for the Vehicle. The Plate shall be identified by having the word 'apportioned,' 'APP,' or 'PRP' and the name of the Base Jurisdiction." The cab card rides in the vehicle, on paper or as an electronic image (§ 600(b)), and its face lists every member jurisdiction and "the weight (in pounds or kilograms) or number of combined Axles for which it is registered in each one" (§ 610). A vehicle so registered "shall be deemed fully registered for any type of movement or operation in all Member Jurisdictions" (§ 510).

What you pay. The Plan does not set the fee; your base jurisdiction and every other member jurisdiction do, and the Plan splits them. § 400: "The Apportionable Fees for a Fleet in a Member Jurisdiction shall be calculated by multiplying the Apportionment Percentage calculated for the Member Jurisdiction by the total Apportionable Fees required under the law of the Member Jurisdiction for full registration of the Vehicles in the Fleet for the Registration Year." The Apportionment Percentage is "the ratio of the distance traveled in the Member Jurisdiction by a Fleet during the Reporting Period to the distance traveled in all Member Jurisdictions by the Fleet during the Reporting Period" (Article II), and the Reporting Period is the July-through-June year before the registration year begins. Run 25 percent of your miles in a state and you owe that state 25 percent of its full registration fee. Paying your base jurisdiction "discharges the Registrant's responsibility for payment of Apportionable Fees to individual Member Jurisdictions" (§ 130); the base jurisdiction may add its own credential and application fees (§ 410(b)).

Trailers are not apportioned. § 515(a): "A Trailer, Semi-Trailer, or Auxiliary Axle properly registered in any Jurisdiction shall be granted full and free Reciprocity." IRP, Inc.'s own registration FAQ answers the question directly: "No, the Plan does not require the apportionment of trailers."

How we verified this: we read the International Registration Plan with Official Commentary, the edition amended January 1, 2024, published by IRP, Inc. and retrieved from its document server on 2026-09-14, together with IRP, Inc.'s Registration FAQ (dated June 12, 2024) and Cost of Registration FAQ. The IFTA Articles of Agreement were read in the edition marked "Effective Date: January 2026," published by IFTA, Inc. and dated March 11, 2026, retrieved from iftach.org on 2026-09-14.

The International Fuel Tax Agreement exists so that a carrier running in several jurisdictions files fuel tax in one place. IFTA Articles of Agreement R150: "It is the purpose of this Agreement to establish and maintain the concept of one fuel use license and administering base jurisdiction for each licensee and to provide that a licensee's base jurisdiction will have the primary responsibility for administering this Agreement." 49 U.S.C. 31705(a) lets a state enforce a fuel use tax reporting requirement "only if the requirement conforms with the International Fuel Tax Agreement."

Who must license. R305: "Any person based in a member jurisdiction operating a qualified motor vehicle(s) in two or more member jurisdictions is required to license under this Agreement, except as indicated in IFTA Articles of Agreement Sections R310 and R500." R310 is the trip-permit alternative: "In lieu of motor fuel tax licensing under this Agreement, persons may elect to satisfy motor fuels use tax obligations on a trip-by-trip basis." If you should have licensed and did not, R305 authorizes a jurisdiction "to assess and collect any and all fuel taxes due from such person for all member jurisdictions."

What you get. R605: "The base jurisdiction shall issue a license and two decals per vehicle. The license and decals shall qualify the licensee to operate in all member jurisdictions without further licensing or identification requirements in regard to motor fuel use taxes." The license "is valid for the current calendar year ending December 31" and "the decals shall be issued annually" (R610). A copy of the license goes in each vehicle (R620), and the decals "must be placed on the exterior portion of both sides of the cab" (R625). The base jurisdiction "may collect its statutorily authorized fees for issuance of the license and decals" (R355); the Agreement fixes no amount, so we print none.

What you file. R930.100: "The tax return shall be for the previous calendar quarter. Tax returns are required even if no operations were conducted or no taxable fuel was used during the tax reporting period." R960.100 sets the deadline: "The tax return and full payment of taxes shall be due on the last day of the month following the close of the reporting period for which the tax return is due. ... If the last day of the month falls on a Saturday, Sunday, or legal holiday, the next business day shall be considered the due date." Applying that rule to the four calendar quarters:

Filing with your base jurisdiction "discharges the responsibility of the licensee for filing of tax returns and payment of individual taxes to all member jurisdictions" (R920). The tax itself is computed at each jurisdiction's rate for the quarter; those rates change quarterly and the current matrix is on our IFTA tax rates page.

The thresholds look identical and mostly are. The wording around them is not, and the differences decide who is in and who is out.

IRP, Article II, "Apportionable Vehicle": "any Power Unit that is used or intended for use in two or more Member Jurisdictions and that is used for the transportation of persons for hire or designed, used, or maintained primarily for the transportation of property, and: (i) has two Axles and a gross Vehicle weight or registered gross Vehicle weight in excess of 26,000 pounds (11,793.401 kilograms), or (ii) has three or more Axles, regardless of weight, or (iii) is used in combination, when the gross Vehicle weight of such combination exceeds 26,000 pounds (11,793.401 kilograms). A Recreational Vehicle, a Vehicle displaying Restricted Plates or a government-owned Vehicle, is not an Apportionable Vehicle; except that a Power Unit, or the Power Unit in a Combination of Vehicles having a gross Vehicle weight of 26,000 pounds (11,793.401 kilograms), or less, nevertheless may be registered under the Plan at the option of the Registrant."

IFTA, R245, "Qualified Motor Vehicle": "a motor vehicle used, designed, or maintained for transportation of persons or property and: .100 Having two axles and a gross vehicle weight or registered gross vehicle weight exceeding 26,000 pounds or 11,797 kilograms; or .200 Having three or more axles regardless of weight; or .300 Is used in combination, when the weight of such combination exceeds 26,000 pounds or 11,797 kilograms gross vehicle or registered gross vehicle weight. Qualified Motor Vehicle does not include recreational vehicles."

Two consequences follow. First, each definition says "in excess of" or "exceeding," so a truck registered at 26,000 pounds exactly is under both lines and one registered at 26,001 is over both. Second, the combination test catches the setup that trips people: a two-axle truck rated under 26,000 pounds pulling a trailer that takes the combination over. IFTA's commentary on R245 records the adopted answer that the first two tests "refer only to the power unit" and the third "refers to the combination." A hotshot rig that is a pickup when empty becomes a qualified motor vehicle the moment the gooseneck goes on and the combined weight crosses 26,000.

The recreational-vehicle carve-out is narrower than its name. IFTA's R249: "vehicles such as motor homes, pickup trucks with attached campers, and buses when used exclusively for personal pleasure by an individual. In order to qualify as a recreational vehicle, the vehicle shall not be used in connection with any business endeavor." IRP's Article II definition is to the same effect. A motor home that hauls anything for money is not an RV under either document.

Each agreement picks a home jurisdiction for you, by its own test.

IRP § 305(a): "An Applicant may elect as its Base Jurisdiction any Member Jurisdiction (i) where the Applicant has an Established Place of Business, (ii) where the Fleet the Applicant seeks to register under the Plan accrues distance, and (iii) where Records of the Fleet are maintained or can be made available." An "Established Place of Business" is "a physical structure located within the Base Jurisdiction that is owned or leased by the Applicant or Registrant" and "staffed during regular business hours" by the applicant's own permanent employees (Article II). An applicant with no such structure anywhere may instead base where it can "demonstrate Residence" by meeting at least three of nine listed factors (§ 305(b)–(c)).

IFTA R212: "Base Jurisdiction means the member jurisdiction where qualified motor vehicles are based for vehicle registration purposes and .100 Where the operational control and operational records of the licensee's qualified motor vehicles are maintained or can be made available; and .200 Where some travel is accrued by qualified motor vehicles within the fleet."

The tests overlap but are not the same test, and IRP, Inc.'s registration FAQ answers the obvious question: "Do my IRP and IFTA base jurisdictions need to be the same? No, the base jurisdiction does not need to be the same. However, the requirements to obtain IRP and IFTA are different." For a small carrier with one office they will almost always coincide; the point is that qualifying for one does not qualify you for the other.

Unified Carrier Registration is neither of these. It is an annual fee under 49 U.S.C. 14504a with its own base-state rule: under § 14504a(a)(2)(A), the base-State is the state "in which the motor carrier, motor private carrier, broker, freight forwarder, or leasing company to which the agreement applies maintains its principal place of business." The fee is set by the number of commercial motor vehicles in the fleet under 49 CFR 367.50, not by distance, and it does not use the 26,000-pound line at all. Use the UCR calculator for your fleet's exact amount.

So a new interstate carrier with one tractor-trailer faces three separate annual obligations: apportioned registration (IRP), a fuel tax license with quarterly returns (IFTA), and a UCR fee. None replaces the USDOT number or operating authority; IRP § 510 notes that the operator of an apportioned vehicle "may be required to obtain interJurisdictional or intraJurisdictional authority to operate in or through a particular Jurisdiction."

• This is not legal advice, and CarrierStat is not affiliated with IRP, Inc., IFTA, Inc., FMCSA, or any state agency. Confirm your obligations with your base jurisdiction before registering or filing.
• We print no fee amounts for IRP plates or IFTA licenses. The Plan and the Agreement each leave those to the base jurisdiction (IRP § 410(b), § 600(d); IFTA R355). No primary source fixes a number, so we do not estimate one.
• The IRP Plan edition we read is dated January 1, 2024, the most recent we could retrieve from IRP, Inc.'s own document server; its website blocks automated retrieval. If a later edition has changed any provision quoted here, the current text controls.
• State weight-distance taxes and intrastate registration are outside both agreements and are not covered here.

International Registration Plan with Official Commentary, adopted September 1973, amended January 1, 2024. Article II definitions ("Apportionable Fee," "Apportionable Vehicle," "Apportioned Vehicle," "Apportionment Percentage," "Base Jurisdiction," "Cab Card," "Credentials," "Established Place of Business," "Recreational Vehicle," "Registration Year," "Reporting Period," "Restricted Plate," "Total Distance," "Trip Permit"), and §§ 105, 110, 130, 135, 300, 305, 400, 410, 500, 510, 515, 525, 600, and 610. Retrieved 2026-09-14 from IRP, Inc.'s document server at cdn.ymaws.com/www.irponline.org; the Plan's landing page is irponline.org/page/The_Plan.

IRP, Inc., FAQs – Registration (June 12, 2024) and FAQs – Cost of Registration. Used for the trailer answer, the base-jurisdiction answer, and the description of the fee calculation. Retrieved 2026-09-14 from IRP, Inc..

IFTA Articles of Agreement, effective date January 2026, document dated March 11, 2026. Sections R150, R212, R245, R249, R305, R310, R325, R355, R605, R610, R620, R625, R655, R810, R920, R930, R960, R970, R1210, and R1220. Retrieved 2026-09-14 from IFTA, Inc. at iftach.org.

49 U.S.C. 31704 and 31705 — statutory basis for the International Registration Plan and the International Fuel Tax Agreement. Retrieved 2026-09-14 from law.cornell.edu.

49 U.S.C. 14504a(a)(2) — the Unified Carrier Registration base-State definition. Retrieved 2026-09-14 from law.cornell.edu. The UCR fee schedule at 49 CFR 367.50 is documented on our UCR calculator.

IFTA fuel tax rates — the current quarter's gasoline and diesel rate for every member jurisdiction, from IFTA, Inc.'s published matrix.

UCR 2026 fee calculator — the separate annual fee, by fleet size, from the § 367.50 table.

Authority startup costs — the federal fees that are fixed in regulation, and why IRP and IFTA fees are not among them.

Carrier authority & insurance lookup — the full census and insurance record for a USDOT or MC number.

Carrier data by state — active registrations, authority, fleet mix, and MCS-150 currency for every state.