International Registration Plan (IRP)
The interstate compact that lets commercial vehicles register once and operate across multiple states with an apportioned plate.
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The International Registration Plan (IRP) is a cooperative agreement among U.S. states, the District of Columbia, and Canadian provinces that provides for proportional registration of commercial vehicles operating in multiple jurisdictions. Instead of obtaining separate vehicle registrations in every state a truck operates in, a carrier can obtain a single apportioned plate through their base state that covers all IRP member jurisdictions.
Under the IRP, registration fees are distributed among the jurisdictions where the carrier operates, based on the percentage of total miles traveled in each jurisdiction during the preceding year. A carrier that operates 60% of its miles in Texas and 40% in surrounding states pays 60% of Texas registration fees and 40% of the surrounding states’ fees — all through a single apportioned registration.
IRP applies to power units used in interstate commerce that have two axles and a gross vehicle weight (or registered gross vehicle weight) exceeding 26,000 lbs, or have three or more axles regardless of weight. Carriers must maintain accurate mileage records by jurisdiction to support their IRP renewals, and new entrants use estimated mileage for their first registration year.
Key Provisions
- Allows commercial vehicles to operate in all IRP member jurisdictions under a single apportioned plate.
- Registration fees apportioned based on percentage of total fleet miles in each jurisdiction.
- Applies to power units with 2 axles over 26,000 lbs GVW or 3 or more axles regardless of weight.
- Carriers maintain mileage records by jurisdiction to support annual IRP renewals.
- New entrant carriers use estimated mileage for the first registration year.
Why It Matters to Truck Owners
Every interstate commercial carrier with qualifying vehicles needs IRP registration — it’s the apportioned plate on every long-haul truck. Operating without a current IRP registration in a member jurisdiction is a violation enforceable at weigh stations and ports of entry. When buying a commercial truck, confirm the vehicle’s IRP registration is current and whether any back fees or penalties are owed, as these can transfer with the vehicle.
Frequently Asked Questions
What is an apportioned plate?
An apportioned plate (IRP plate) is a commercial vehicle registration credential issued by the carrier’s base state that is valid for operation in all IRP member jurisdictions. The plate indicates that the vehicle’s registration fees have been apportioned among the jurisdictions where the carrier operates based on fleet mileage.
How are IRP fees calculated?
IRP fees are calculated by determining what percentage of the carrier’s total fleet miles were driven in each member jurisdiction during the preceding year, then applying that percentage to each jurisdiction’s registration fee rate. The total fee is paid to the base jurisdiction, which distributes it to the other states and provinces.
Is IRP registration the same as USDOT number registration?
No — these are different requirements. USDOT number registration is a federal FMCSA requirement for safety oversight. IRP is a state-level registration program for vehicle registration fees. Interstate commercial carriers typically need both: a USDOT number from FMCSA and IRP registration from their base state.
Official source: IRP, Inc. — official site
Related Federal Trucking Laws
- Part 367 — Standards for Registration with States (UCR)
- Part 365 — Rules Governing Applications for Operating Authority
- International Fuel Tax Agreement (IFTA)
This page is provided for informational purposes only and is not legal advice. Always verify current requirements at irponline.org or with a qualified transportation attorney.
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