International Registration Plan (IRP): Apportioned Plates Explained

Before IRP, a trucker running through ten states would have had to register — and pay full registration fees — in all ten. The International Registration Plan fixed that. It is a cooperative agreement among the 48 contiguous U.S. states, the District of Columbia, and the Canadian provinces that lets a carrier register once in a single 'base jurisdiction' and receive an apportioned plate that is recognized everywhere in the plan.

The word 'apportioned' is the key idea: instead of paying every state in full, you pay each jurisdiction a portion of its registration fee based on the share of your total miles that you actually drove there. One plate, one cab card, and your fees are divided fairly among the places you run. QuickTruckTax helps you understand these rules and organize the mileage and vehicle information you'll need so your application or renewal is accurate — we do not register your vehicle or submit anything to a state on your behalf.

Your apportioned fee is built jurisdiction by jurisdiction. For each member state or province you operated in, the calculation roughly works like this: take the miles you drove in that jurisdiction, divide by your total fleet miles everywhere, and multiply that percentage by that jurisdiction's full annual registration fee for your vehicle's weight. Add up every jurisdiction's share and that's your total IRP bill.

For example, if 30% of your total miles were in Texas, you pay roughly 30% of what Texas would charge for full registration of that truck. Drive more miles in a high-fee state and your bill goes up; drive fewer and it goes down. Because actual mileage drives the math, your trip records are the single most important thing to get right.

New carriers with no mileage history yet are usually assigned 'estimated' or average per-jurisdiction distances by their base state for the first registration year, then switch to actual reported miles at renewal. Fee amounts vary widely by jurisdiction and vehicle weight — always verify the current fees on your base state's official IRP site rather than relying on a single quoted number.

When your IRP registration is approved, your base jurisdiction issues a cab card along with your apportioned plate. The cab card is the official document that lists your account, the vehicle, its registered weights, and the jurisdictions in which it is apportioned. It is your proof that the truck is legally registered to run interstate.

Keep a current cab card in the vehicle at all times — enforcement officers will ask for it at scales and inspections. If you add a jurisdiction, change a vehicle's weight, or add or delete a unit mid-year, your base state issues an updated or supplemental cab card. Treat the cab card like the truck's passport: if it isn't current and in the cab, you can be cited or put out of service even if your plate looks fine.

IRP is built on self-reported mileage, so jurisdictions audit carriers to make sure the numbers are honest. To survive an audit, you need source records that show total distance traveled and the distance in each jurisdiction — typically individual trip records, driver logs, fuel and toll receipts, GPS or ELD mileage data, and dispatch records. Most jurisdictions expect you to retain these records for several years.

The most common reason carriers get hurt in an IRP audit is incomplete records: gaps in trip sheets, missing state-line crossings, or relying on rough estimates instead of actual miles. QuickTruckTax can help you understand exactly which records IRP expects and help you organize and validate your mileage data before you file your renewal, so the application you prepare matches what your records can support. We provide general guidance only — confirm record-keeping requirements with your base jurisdiction.

IRP and IFTA are often confused because they both cover interstate trucks and both rely on mileage by jurisdiction — but they are different programs. IRP is about vehicle registration: it determines where your truck is plated and how registration fees are split. IFTA, the International Fuel Tax Agreement, is about fuel taxes: it determines how the fuel tax you owe is divided among the jurisdictions you drove in.

Many of the same records — miles per jurisdiction, trip sheets, fuel receipts — feed both programs, which is why carriers often manage them together. If you need apportioned plates under IRP, you very likely also need an IFTA license. See our IFTA guide for how fuel-tax reporting works, and keep one clean set of mileage records that supports both.