Every dollar of your UCR fee is determined by one number: how many commercial motor vehicles you owned or operated. Count too high and you overpay — sometimes by an entire bracket. Count too low and you become exactly the kind of bracket retreat the states are required to audit. The counting rules are statutory, set by 49 USC §14504a with the vehicle definition borrowed from 49 USC §31101, and they are more carrier-friendly than most filers realize.
The UCR Definition of a Commercial Motor Vehicle
For registration years after 2009, 49 USC §14504a(a)(1) defines a commercial motor vehicle for UCR as a self-propelled vehicle described in section 31101. Per the UCR Plan's published definition, that is a self-propelled vehicle used on the highways in commerce principally to transport passengers or cargo, if the vehicle:
- has a gross vehicle weight rating or gross vehicle weight of at least 10,001 pounds, whichever is greater — or, when connected to trailing equipment, a gross combination weight rating or weight of at least 10,001 pounds; or
- carries placarded amounts of hazardous materials, regardless of weight; or
- is designed to carry more than 10 passengers, including the driver.
Two practical notes. First, the line is 10,001 pounds — the CMV threshold of §31101 — not the 26,001-pound CDL line. Plenty of vehicles that need no CDL still count for UCR. Second, the combination clause catches light power units: a 9,000-pound pickup is out by itself, but the same pickup pulling a 5,000-pound equipment trailer in interstate commerce is a 14,000-pound combination and counts.
Trailers Never Count
Because the UCR definition covers self-propelledvehicles only, towed units are out: trailers, dollies, and converter gear never enter the count. A carrier running 8 tractors and 12 trailers counts 8 vehicles and files in Bracket 3 (6–20), not Bracket 4. Counting trailers is one of the most common — and most expensive — UCR mistakes, because it routinely pushes small fleets over a bracket boundary they were never near.
Leased Vehicles: Who Counts the Truck
Section 14504a(f)(2) settles the lease question: a CMV is “owned or operated” by the registrant if it is registered in the registrant's name or controlled by the registrant under a long-term leaseduring the registration year. So a leased-on owner-operator's truck running under a carrier's authority via a 49 CFR Part 376 lease counts in that carrier's fleet. The owner-operator counts it personally only if they hold their own active authority and run under it. The full leased-on analysis — including what happens when an owner-operator keeps a dormant MC number — is in the UCR for leased-on owner-operators guide.
Two Legal Counting Bases: MCS-150 or the June 30 Actual
Section 14504a(f)(3) gives every motor carrier, motor private carrier, and freight forwarder a choice of counting basis:
- The MCS-150 number— the count of CMVs the entity indicated it operates on its most recently filed MCS-150; or
- The actual count— the total CMVs owned or operated for the 12-month period ending on June 30 of the year immediately before the registration year. For the 2026 registration year, that is July 1, 2024 through June 30, 2025.
Use whichever reflects reality. A stale MCS-150 that still shows trucks you sold two years ago is a legal basis but an expensive one; the June-30 actual count is usually the cheaper choice for a fleet that downsized. Just keep the documentation — bills of sale, lease terminations, registration records — because filing a lower bracket than your MCS-150 implies is precisely what lands a carrier on the audit lists.
The Intrastate Exclusion
The same subsection lets motor carriers and motor private carriers elect not to count vehicles used exclusively in the intrastate transportation of property, waste, or recyclable material. Exclusivity is the operative word: one interstate load during the period puts the truck back in the count, and the exclusion does not extend to passenger operations. A mixed fleet — say 19 interstate trucks plus 2 that never leave the state — legitimately files at 19. Keep dispatch and trip records proving the two never crossed a state line, because the exclusion is a bracket reduction and auditors verify bracket reductions.
Matching the Count to the 2026 Brackets
With the count settled, the bracket is mechanical. The federal fees below are the 2026 schedule published by the UCR Plan:
| Bracket | Vehicles owned or operated | Federal fee per entity |
|---|---|---|
| B1 | 0–2 | $46 |
| B2 | 3–5 | $138 |
| B3 | 6–20 | $276 |
| B4 | 21–100 | $963 |
| B5 | 101–1,000 | $4,592 |
| B6 | 1,001+ | $44,836 |
Two statutory shortcuts sit outside the table. Brokers and leasing companiespay the smallest bracket fee regardless of equipment, per §14504a(f)(1)(A)(ii). Freight forwarders that operate their own trucks use their fleet count like a carrier. For the bracket boundaries and what they mean in dollars, see the UCR tier by fleet size guide and the 2026 fee bracket reference.
Not sure which bracket you land in?
We validate your fleet count against your MCS-150 before submitting — so you never overpay a bracket or trip an audit flag.
File UCR NowBottom line:Count self-propelled power units at 10,001 pounds and up — owned or long-term leased — and nothing else. Trailers never count. Use your MCS-150 or the June-30 twelve-month actual, exclude exclusively-intrastate property vehicles if you can prove it, and keep the records. The count is the fee; get it right once and every year after is mechanical.