By Evan Reid, Founder of Haul Handbook · Updated Jul 19, 2026
Kentucky IRP administration
Which trucks need apportioned plates
Apportioned registration is for interstate trucks. Kentucky requires it for a vehicle over the combined or registered gross weight line, or one with three or more axles regardless of weight, when it operates outside Kentucky. A truck that stays inside the state registers through the regular commercial channel instead. Kentucky is your base jurisdiction when your business sits physically in Kentucky, proven with documentation of a Kentucky physical address.
How fees work and what the cab card does
Apportioned fees are not flat. They vary by vehicle weight, type, year, kind of operation, and the mileage your fleet ran across jurisdictions the year before, so two carriers with identical trucks can pay different totals. Kentucky publishes a worked example for a fully loaded plate to set expectations, shown here from the source. Each apportioned truck also carries a cab card that lists the jurisdictions it may run in, and it stays in the truck during operation.
Renewal and records
Apportioned registrations renew once a year through the Motor Carrier Portal, with the same apportioned certificates, lease agreement, and stamped federal Form 2290 you filed to open the account. Keep clean mileage records by jurisdiction, because IRP fees are built on the distance you report and base states audit apportioned fleets.
What pairs with IRP
The same interstate operation that needs apportioned plates almost always needs an IFTA license through Kentucky, and heavy power units owe the federal Form 2290 heavy vehicle use tax before plates renew. To compare how other states run IRP, see the national IRP registration table.
Frequently asked questions
Where do I register for IRP in Kentucky?
- Through the Division of Motor Carriers on the Motor Carrier Portal. Kentucky is your base jurisdiction when your business is physically located in the state, which you document at application.
Which trucks need apportioned plates in Kentucky?
- Interstate trucks over the combined or registered gross weight line, or with three or more axles regardless of weight. A truck that never leaves Kentucky uses regular commercial registration instead.
How are Kentucky IRP fees calculated?
- By apportionment. Your fee depends on vehicle weight, type, year, operation, and the share of last year's miles run in each jurisdiction, so identical trucks can cost different amounts. Kentucky publishes a worked example for a fully loaded plate, shown on this page.
What is a cab card?
- The apportioned registration document for each truck. It lists the jurisdictions the vehicle may operate in and the carrier responsible for its safety, and it stays in the vehicle during operation.
Haul Handbook publishes educational information about trucking registration and compliance requirements. This is not legal, financial, or tax advice. Rules, fees, and deadlines change; confirm with the agency before you file or pay.