IRP
International Registration Plan — a reciprocal vehicle registration agreement among U.S. states and Canadian provinces that allows commercial vehicles to register in their base jurisdiction and pay proportional registration fees for all member jurisdictions based on miles traveled in each.
Why this glossary page exists
This page is built to do more than define a term in one line. It explains what IRP means, why buyers keep seeing it while researching software, where it affects category and vendor evaluation, and which related topics are worth opening next.
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Compare ELD Compliance software →How IRP Proportional Registration Works
Under IRP, a carrier registers their fleet with their base jurisdiction (the state or province where the vehicles are based, where operational records are maintained, and where the carrier has a physical presence). The base jurisdiction collects total registration fees and distributes them to all other jurisdictions in proportion to the miles operated in each. This means a carrier operating 30% of their miles in Texas, 25% in Oklahoma, and 45% in Kansas pays 30% of the Texas registration fee, 25% of Oklahoma's, and 45% of Kansas's — all in one payment to their home state.
IRP Registration Requirements and Credentials
Vehicles required to register under IRP are those used in interstate commerce with two or more axles and a GVW or GVWR over 26,000 lbs, or three or more axles regardless of weight. Vehicles registered under IRP receive an apportioned license plate and a cab card (the IRP registration document) that lists all member jurisdictions the vehicle is authorized to travel in. Law enforcement in any member jurisdiction accepts the cab card as proof of registration. The cab card must be kept in the vehicle at all times — a missing cab card can result in the same citation as operating unregistered.
Operational Example: Estimating IRP Fees
Scenario
A carrier based in Missouri with 5 Class 8 tractors operates primarily in Missouri (40%), Tennessee (25%), Arkansas (20%), and Illinois (15%). Missouri's annual registration fee for a 80,000 lb GVW vehicle is approximately $1,840. Tennessee's equivalent fee is approximately $1,620; Arkansas is $1,440; Illinois is $2,280. The IRP calculation: Missouri portion = 40% × $1,840 = $736; Tennessee portion = 25% × $1,620 = $405; Arkansas portion = 20% × $1,440 = $288; Illinois portion = 15% × $2,280 = $342. Total IRP registration per vehicle: $1,771/year. For 5 vehicles: $8,855/year. The alternative — registering fully in Missouri and buying trip permits for each out-of-state trip — would cost significantly more for a carrier making 3+ interstate trips per week.
IRP Mileage Reporting and Audit Compliance
- Maintain a mileage log for each vehicle showing date, trip origin and destination, miles by jurisdiction, and total miles — this is the source document for your annual IRP renewal
- New carriers with no prior mileage history use an 'estimated mileage' for the first registration year — jurisdictions typically assign a default of 20% per jurisdiction if you operate in 5+ states
- Retain mileage records for 3 years after the registration year they support — IRP audits look back 3 years
- When adding a new vehicle mid-year, the vehicle is registered for the remaining months only and fees are prorated accordingly
- Verify that your telematics system captures state-line crossings accurately — GPS accuracy in border areas affects the reliability of auto-generated IRP mileage reports