IRP, Prorate, Apportioned Plate — Why Three Names for the Same Thing

Half the new-client calls we get start with someone apologising: "I'm not sure if I need IRP or Prorate — what's the difference?" The honest answer: there isn't one. They're the same program.

One program, three nicknames The International Registration Plan (IRP) is the official name of the cooperative agreement between 10 Canadian provinces and 48 US states. But carriers rarely call it that:

- **In Alberta, BC and Saskatchewan**, it's almost always called **Prorate** (because the registration office is the "Prorate Services Section"). - **In Ontario, Quebec and the Maritimes**, people usually say **IRP**. - **In the US**, you'll hear **Apportioned plate** or **Apportioned registration**.

All three refer to the exact same plate, the exact same paperwork, and the exact same fee structure.

Why "Prorate"? The word "prorate" describes how the fees are calculated. Your annual registration fee gets *prorated* across every jurisdiction you drive in, based on how many kilometres you actually log there. Drive 60% of your km in Alberta and 40% in Saskatchewan, and your fees split roughly the same way. That's the whole idea — one plate, one invoice, fairly divided.

Why "Apportioned"? Same concept, different word. "Apportioned" means divided proportionally. The US states stuck with the older legal term; western Canada chose the friendlier one.

What about IFTA? IFTA is a **different** program — same idea (one report, fees split across jurisdictions), but for **fuel tax** instead of plate registration. Most carriers who need IRP / Prorate also need IFTA. They're separate programs and they're filed separately.

The bottom line If someone in your shop talks about "renewing the Prorate", another driver mentions "the IRP cab card", and your US broker asks about the "Apportioned plate" — they're all talking about the same piece of paper. Don't let the vocabulary slow you down.

Need help with yours? Whichever name you call it, we handle it.