Home › Guides › IRP Apportioned Plates Explained
If you run across state lines, one license plate can cover every state you drive in. Here is how the International Registration Plan works, in plain English, without the jargon.
An apportioned plate is a single license plate that legally registers your truck in more than one state or province at the same time. It comes out of the International Registration Plan (IRP), a cooperative agreement among the 48 contiguous U.S. states, the District of Columbia, and 10 Canadian provinces.
Without it, a truck that crosses state lines would, in theory, need to be registered in every state it enters. IRP replaces that with one plate and one cab card — a document that lists all the jurisdictions you are registered to run in and the weight you are registered at. You keep the cab card in the cab.
Not every vehicle needs one. IRP generally applies to power units used to carry people or property across state lines that either have two axles and a gross vehicle weight over 26,000 pounds, have three or more axles regardless of weight, or are used in a combination that exceeds 26,000 pounds. Lighter vehicles and purely in-state operations usually fall outside it, but your base state sets the details, so confirm with them.
You do not apply to every state separately. You apply once, through your base jurisdiction — normally the state where your business is established, where your trucks are based and accrue mileage, and where you keep your operational records.
Your base state issues the plate and the cab card, collects the fees, and then settles up with the other jurisdictions on your behalf. That is the whole point of the system: one point of contact instead of fifty.
For a new registrant with no travel history yet, the base state uses an average per-mile chart or estimated distances to set your first year's fees. After that, you report the actual miles you ran.
This is the part that surprises people. You do not pay full registration in every state. You pay each state a share based on the percentage of your total miles that you actually drove there.
The math is straightforward in principle. You report the distance your fleet traveled in each jurisdiction during the reporting period. Your base state works out what full registration would cost in each of those jurisdictions, then charges you that state's percentage of it based on your mileage share. Run 60% of your miles in your home state and 5% in a neighboring one, and your fee reflects roughly that split. Add all the shares together and that is your apportioned bill.
Because of this, accurate mileage records are not optional. Keep your trip records and Individual Vehicle Distance Records; they are what your renewal and any audit are built on. The actual fee amounts vary by state and by your vehicle's weight, and they change over time, so we are not going to quote a number here — your base state's IRP office or online portal will show your figures.
IRP registration renews once a year, on your base state's schedule — not on a single national date. Your renewal window and expiration month are set by the state that issued your plate.
Each renewal is built on the miles you reported for a set reporting period (many jurisdictions use the year running July 1 through June 30 before the registration year). Miss the window and you risk running on an expired plate, which can mean citations, fines, or being placed out of service. The safest habit is to know your own renewal month and treat it as a fixed annual deadline, the same way you treat any other filing.
People mix these up constantly because they look similar and often apply to the same trucks. They are two separate programs.
IRP is about registration — the plate and cab card that let your truck legally operate across state lines. IFTA, the International Fuel Tax Agreement, is about fuel tax — making sure each state gets the fuel-use tax for the miles you drove there, regardless of where you actually bought the diesel.
They share a lot of DNA: both run through a base jurisdiction, both cover roughly the same class of heavy interstate vehicles, and both depend on your mileage records. But the filings are different and the deadlines are different. IRP renews once a year on your base state's schedule; IFTA returns are filed quarterly. You typically need both if you run interstate, and keeping one current does nothing for the other.
Apportioned plates are one deadline in a stack that a small carrier has to keep straight. The others include your biennial MCS-150 update with FMCSA, your annual Form 2290 Heavy Highway Vehicle Use Tax with the IRS, Unified Carrier Registration (UCR), and your quarterly IFTA returns.
The MCS-150 one trips up a lot of owner-operators because the timing is buried in your USDOT number. Under the federal rule (49 CFR 390.19T), you must update it every 24 months. The month comes from the last digit of your USDOT number (1 = January through 9 = September, 0 = October), and the year from the second-to-last digit — odd means odd years, even means even years. If you would rather not do that in your head, our free MCS-150 due-date calculator on the site works it out from your number.
IRP itself does not have a hidden formula like that; it is simply your base state's renewal month. The hard part is remembering all of these on time, which is exactly the gap a reminder service is meant to close.
An IRP apportioned plate lets one truck run legally across many states, with fees split by the share of miles you drive in each — registered and renewed once a year through your base state. It is separate from IFTA (fuel tax) and separate again from your MCS-150, Form 2290, and UCR deadlines. This is general information, not legal or tax advice, and DOTDeadline is not affiliated with or endorsed by FMCSA or the IRS — confirm your specific fees, dates, and requirements with your base state's IRP office and the official agency.
Enter your USDOT number once and see your MCS-150 due date free — then keep every federal deadline in one place.
Check my date →DOTDeadline is an independent reminder tool. It is NOT affiliated with, endorsed by, or connected to the FMCSA, the U.S. DOT, the IRS, or any government agency. General information only — not legal, tax, or compliance advice. Always confirm with the official agency.