Apportioned Plates (IRP) Explained: Who Needs Them & How to Get One
Apportioned plates let a single interstate truck operate legally in every state and Canadian province on one registration — with fees split by the miles you drive in each jurisdiction. This guide explains what apportioned plates are, who is required to have them, how to get them through the IRP, and how they connect to your IFTA mileage records.
Herman Armstrong
Founder, FleetCollect • Former fleet compliance manager with 8+ years experience in DOT regulations and driver qualification file management.
Apportioned plates are license plates that let one commercial vehicle operate in every member state and province on a single registration, instead of registering the truck separately in each one. Issued under the International Registration Plan (IRP), they split your registration fees across jurisdictions based on the share of miles you actually drive in each. If you run interstate above certain weight limits, they are not optional — they are how you register a truck to cross state lines legally.
In this guide, you will learn:
- What apportioned plates are and why they exist
- Exactly who is required to have them
- How the International Registration Plan splits your fees
- How to get apportioned plates through your base state
- The difference between IRP registration and IFTA fuel tax
- Why your mileage records power both — and how to keep them audit-ready
What Are Apportioned Plates?
Apportioned plates — also called IRP plates, prorate plates, or apportioned tags — are commercial vehicle registration plates issued under the International Registration Plan (IRP). The IRP is a registration agreement among the 48 contiguous U.S. states, the District of Columbia, and 10 Canadian provinces.
Before the IRP, a truck that crossed state lines had to be registered — and pay full registration fees — in every state it operated in. Apportioned registration replaced that with a single, proportional system. You register once in your base jurisdiction (your home state), report the jurisdictions you operate in, and pay one fee that each jurisdiction shares based on the percentage of your total distance driven there.
The Core Idea
One plate, one cab card, one registration fee — divided among every state and province you run in, according to the miles you actually drive in each.
Along with the plate itself, you receive a cab card that lists every jurisdiction your registration covers and your registered weight in each. The cab card must be carried in the vehicle and produced on request at inspections.
Who Needs Apportioned Plates?
You need apportioned plates when your vehicle is an apportionable vehicle — meaning it is used in interstate commerce (it crosses state or provincial lines) and meets at least one of these thresholds:
- Two axles and a gross vehicle weight or registered gross weight over 26,000 pounds, or
- Three or more axles, regardless of weight, or
- Used in a combination (tractor plus trailer) whose combined weight exceeds 26,000 pounds.
If any of those apply and you operate in two or more IRP jurisdictions, you are required to register under the IRP. If your truck stays under those limits, or you operate only within a single state, you generally do not need apportioned plates — standard state registration covers you.
⚠️ Common mistake
Running interstate on standard, non-apportioned plates when your truck is over the threshold can lead to fines, citations, and being turned around at a scale. If you cross state lines above 26,000 pounds or with three or more axles, you need apportioned registration — not regular plates plus "hope."
Key Takeaway: The test is simple — interstate operation plus weight or axle count over the IRP threshold means you need apportioned plates.
How the IRP Splits Your Fees
Apportionment is where the "fair share" math happens. Your base state totals up the registration fee owed to each jurisdiction like this:
- You report the distance you drove in each jurisdiction during the reporting period (typically July 1 through June 30 of the prior year), or estimated distance if you are brand new.
- The base state calculates the percentage of your total fleet distance driven in each jurisdiction.
- Each jurisdiction's full registration fee for your weight is multiplied by that percentage.
- Those apportioned amounts are added together into one invoice you pay to your base state, which then distributes the money to the others.
So if 60% of your miles are in Texas and 40% are in Oklahoma, you pay roughly 60% of the Texas fee and 40% of the Oklahoma fee — on a single bill. This is why accurate, per-jurisdiction mileage records matter so much: they directly determine what you owe.
How to Get Apportioned Plates
You apply through your base jurisdiction's IRP office (usually part of the state DMV or Department of Transportation). The general process:
- Establish your base jurisdiction. This is the state where you have an established place of business, where the vehicle is based, and where mileage is accrued — you must be able to prove it.
- Gather vehicle and carrier information. Your USDOT number, proof of business, vehicle details (VIN, weight, axles), and title or lease information.
- Report your jurisdictions and distance. List every jurisdiction you will operate in and your actual or estimated miles in each.
- Pay the apportioned fee your base state calculates.
- Receive your apportioned plate and cab card. Put the plate on the truck and keep the cab card in the cab.
Apportioned registration is renewed annually, and at each renewal you report your actual distance by jurisdiction for the reporting period so your fees are recalculated to match where you really ran.
Apportioned Plates vs. IFTA: Two Programs, One Set of Miles
Carriers often confuse IRP and IFTA because both are interstate, jurisdiction-based programs. Here is the clean distinction:
| IRP (Apportioned Plates) | IFTA | |
|---|---|---|
| Covers | Vehicle registration | Fuel tax |
| Filed | Annually (renewal) | Quarterly |
| Based on | Miles per jurisdiction | Miles + fuel per jurisdiction |
| Proof carried | Cab card + plate | IFTA license + decals |
The crucial point: both programs run on the same jurisdictional mileage. The distance records you keep for IFTA are the distance records you report for your IRP renewal. Keep one accurate set of per-state miles and you have fed both — and an IRP audit and an IFTA audit are both, at their core, a check of whether your mileage records hold up.
Track the miles once, use them for both
Apportioned plates and IFTA both come down to one thing: accurate, defensible miles in every state. FleetCollect's driver app records your state-by-state mileage automatically by GPS — the same data you need for your IRP renewal and your quarterly IFTA return:
- Automatic per-jurisdiction mileage as the truck drives — no trip sheets
- Audit-ready distance records for IRP renewals and IFTA filings
- One source of truth instead of two sets of paperwork
For more on keeping those miles clean, see our guide on how to track IFTA miles.
Frequently Asked Questions
Are apportioned plates the same as IFTA?
No. Apportioned plates (IRP) are about registering your vehicle to operate interstate. IFTA is about paying fuel tax. They are separate filings — annual versus quarterly — but both are calculated from your miles in each jurisdiction.
What is a cab card?
A cab card is the registration document issued with your apportioned plate. It lists every jurisdiction your registration covers and your registered weight in each. It must be kept in the vehicle and shown at inspections.
Can I add a state to my apportioned registration mid-year?
Yes. If you start operating in a jurisdiction you did not include, you can add it to your IRP account through your base state and pay the apportioned fee for it. For a single occasional trip, a temporary trip permit is usually the simpler option.
How long do I have to keep IRP mileage records?
IRP requires you to retain the distance records supporting your registration for audit — generally the current registration year plus the preceding years covered by the plan, and retention periods can be longer in some jurisdictions. Because IRP audits can go back several years, keep clean per-jurisdiction mileage records the same way you do for IFTA.
Disclaimer: This article provides general guidance on the International Registration Plan and apportioned registration. Weight thresholds, fees, base-jurisdiction rules, and record-retention periods vary by state and can change. Always verify current requirements with your base jurisdiction's IRP office and at irponline.org.