UCR Tier Explained by Fleet Size: The 2027 Tier Table

UCR is a six-tier program. The tier you fall into is determined by one number: the count of commercial motor vehicles your entity operated in interstate commerce during the prior 12 months. Statutory authority sits in 49 USC §14504a, with the regulatory mechanics at 49 CFR Part 367. FMCSA sets the dollar amounts for each tier through rulemaking published in the Federal Register, and they stay in place until a later rulemaking changes them; the bracket structure itself does not change.

This guide walks the full 2027 tier table, explains exactly how the count is calculated, and covers the boundary cases that catch carriers off guard at audit.

The 2027 UCR Tier Table

The federal portion of the UCR fee is set on a graduated curve. Tier 1 is the flat-rate floor; each successive tier scales up. Below is the 2027 bracket structure:

• Tier 1 — 0 to 2 vehicles. The entry-level tier. Captures single-truck owner-operators, and every freight broker, freight forwarder, and leasing company that does not operate vehicles directly. This is also the tier most newly authorized carriers file at in their first registration year. Fast Trucking Compliance Tier 1 is $90 one-time ($55 UCR government fee + $35 service fee).
• Tier 2 — 3 to 5 vehicles. Small fleets — carriers who have added one or two drivers beyond a single owner-operator setup. Most regional “starter” carriers spend at least one or two registration years here.
• Tier 3 — 6 to 20 vehicles. Mid-sized regional fleets and dedicated-route carriers. The federal portion of the fee jumps appreciably between Tier 2 and Tier 3, which is the first place tier-management becomes a real budgeting question.
• Tier 4 — 21 to 100 vehicles. Established regional operations. The bracket spans five times the vehicle count of Tier 3 but the fee scales sublinearly — carriers in the 50–75 truck range often find Tier 4 surprisingly affordable per truck.
• Tier 5 — 101 to 1,000 vehicles. Large national or multi-region carriers, dedicated-contract fleets, and major LTL operations. Bracket spans an order of magnitude.
• Tier 6 — 1,001 or more vehicles. The top tier, populated almost entirely by publicly traded national carriers and the largest household- goods movers. The annual UCR fee here is a rounding error in fleet-budget terms, but the registration is still mandatory.

Specific dollar figures set by FMCSA rulemaking for the 2027 registration year should always be verified against the most recent Federal Register notice. The bracket structure is statutory; the dollar amounts are administrative.

How the Vehicle Count Is Computed

The most common audit finding is a tier mismatch driven by miscounting. The statute is precise: count the commercial motor vehicles operated in interstate commerce during the prior 12 months by the registrant. Three details matter.

First, the relevant period is the prior 12 months — not the fleet you operate today. A carrier that ran 25 trucks during 2026 and downsized to 18 by January 2027 still files at Tier 4 for the 2027 registration year. The snapshot at the moment of filing does not control.

Second, the count is over the entity's entire interstate operation. Trucks that were on the road for any portion of the lookback window count, even if they were sold mid-year. A carrier that operated 22 trucks for the first quarter and 18 for the rest of the year files at Tier 4 (the count peaked at 22, above the Tier 3 ceiling of 20).

Third, the count includes leased-in vehicles. If you are the registrant and an owner-operator was leased on under your authority, that truck counts in your total. The owner-operator's separate UCR (if they have one) is a different registration question and does not subtract from yours.

Boundary Cases

Carriers near a tier boundary are where mistakes — and tier-shopping attempts — happen. A few patterns worth flagging:

• The 21-truck jump. The largest dollar-per-truck delta in the schedule sits at the Tier 3 / Tier 4 boundary. A 20-truck carrier and a 21-truck carrier face very different bills. If trucks were sold or parked during the lookback window, document the dates so the count is defensible at audit.
• Brokers with a small fleet. A brokerage that also holds carrier authority and operates a handful of trucks is filed at the tier matching the fleet count, not at Tier 1. The broker side does not exempt the carrier side.
• Mid-year acquisitions. If your entity acquired another carrier mid-year and inherited their fleet, the inherited trucks count from the date they came under your authority forward. They do not get charged retroactively for the prior operator's pre-acquisition operations.

Anti-Fragmentation

Fragmenting a single business into multiple legal entities to dodge a higher tier is a known pattern, and the UCR Plan has anti-fragmentation guidance specifically targeting it. A 30-truck carrier that splits into three 10-truck LLCs has not cleverly downgraded to three Tier 3 filings — it has created a 49 USC §14504a violation. Plan auditors look at common ownership, common dispatch, and shared insurance to identify fragmented entities, and the resulting penalty plus assessed back-fees is meaningfully more than the tier delta would have been.

Documenting the Count for Audit

Most carriers never get audited on UCR, but the few that do are usually flagged by a tier inconsistency between UCR and another federal data source — most often the MCS-150 fleet count or the IRP apportioned-fleet roster. Keep a simple spreadsheet for each registration year: VINs operated, dates active, lease status, and any dispositions (sold, totaled, returned to lessor). When the UCR Plan asks for a tier justification, an organized fleet ledger answers the question without a scramble.

Cross-checks worth running annually before filing: pull your current MCS-150 on-record vehicle count, your IRP fleet roster, and your insurance schedule. If any of those three has a meaningfully different count than the figure you are about to put on UCR, reconcile the difference now. The UCR Plan's audit triage process pulls the same federal records on a delta-check basis, and a carrier that filed UCR at Tier 2 while running 8 trucks on its IRP fleet will eventually receive a friendly letter.

How the Tiers Compare to Other FMCSA Programs

UCR's six-tier structure is unusual among federal trucking registrations. Several adjacent programs use much flatter fee curves:

• BOC-3 is a one-time, flat-fee designation under 49 CFR Part 366. No tiering — a single-truck owner-operator and a 5,000-truck national pay the same federal filing fee.
• MCS-150 is a free biennial update with no fees at all, regardless of fleet size.
• USDOT registration itself is also free, although mid-year changes (legal name, address) trigger Form MCS-150 amendments.

The six-tier UCR curve exists because UCR is fundamentally a state cost-recovery program, not a federal license fee. Larger fleets generate more state-level enforcement activity, so they pay proportionally more — the legislative compromise that built the UCR program in the first place under SAFETEA-LU was explicitly that small carriers would not subsidize the inspection costs of large ones.

Tier Movement Year Over Year

Carriers are not locked into a tier. Each year's registration is a fresh count, and the tier reflects whatever the prior 12 months looked like. A carrier that grew from 8 to 14 trucks during 2026 stays in Tier 3 for 2027 (since both endpoints fall within 6–20). A carrier that grew from 18 to 28 trucks during 2026 moves up to Tier 4 for 2027 (the count is the peak, which crossed the 21-truck threshold).

Downward movement works the same way. A carrier that downsized from 35 to 18 trucks during 2026 stays at Tier 4 for 2027, because the prior-12-month count peaked at 35. The downgrade does not show up until the 2028 registration, after a full 12-month period of operating at the lower count.

For more on the underlying fee structure and what the federal portion funds, see the UCR tiers and fees guide. For the tier rules around brokers and forwarders specifically, see the UCR for brokers and forwarders guide.

Bottom line: Six tiers, defined by the prior-12-month CMV count under 49 USC §14504a. Count includes leased-in equipment, captures any vehicle on-fleet during the window, and applies to the legal entity holding authority. Document the count, file at the honest tier, and the audit risk drops to nearly zero.