A USDOT number identifies a motor carrier to FMCSA for safety oversight: inspections, crashes, audits and ratings are all tracked against it. An MC number is the docket number for operating authority, the separate permission a for-hire carrier needs to haul regulated freight for pay across state lines. Every interstate commercial motor vehicle operator needs a USDOT number; only for-hire carriers (and brokers) need an MC number as well.
The short comparison
| USDOT number | MC number (operating authority) | |
|---|---|---|
| What it is | FMCSA’s identifier for the company (390.19T(h)(1)) | Docket number for the authority granted under Part 365 |
| Purpose | Safety oversight | Permission to operate for-hire (economic registration) |
| Who needs it | Motor carriers operating CMVs in interstate commerce; intrastate hazmat carriers needing a safety permit | For-hire carriers of regulated commodities in interstate commerce; brokers; freight forwarders use an FF number |
| Federal fee | None listed in the Part 360 fee schedule | $300 per type of authority (360.3T(f)(1)) |
| Extra filings | MCS-150 update every 24 months | Liability insurance filing and BOC-3 process agents, kept current |
| On the truck | Required, preceded by "USDOT" (390.21T) | Not required by 390.21T |
The USDOT number
Who needs one
49 CFR 390.19T(a)(1): a motor carrier "conducting operations in interstate commerce must file a Motor Carrier Identification Report, Form MCS-150," and under 390.19T(h)(1) FMCSA then issues the USDOT number. 390.19T(a)(2) adds intrastate carriers that need a hazardous materials safety permit under Part 385, subpart E; they file Form MCS-150B. New applicants now do all of this through the online registration system (390.200T and 365.106T).
The trigger is a commercial motor vehicle as defined in 390.5T: a vehicle used in interstate commerce that
- has a GVWR, GCWR, gross vehicle weight or gross combination weight of 10,001 pounds or more, whichever is greater; or
- is designed or used to transport more than 8 passengers (including the driver) for compensation; or
- is designed or used to transport more than 15 passengers (including the driver), not for compensation; or
- carries hazardous materials in a quantity requiring placards.
That is a much lower line than the CDL threshold. A pickup and trailer rated at 10,001 pounds or more combined, used in business across state lines, needs a USDOT number even when the driver needs no CDL. Carriers that stay inside one state are governed by their state’s rules on this point; check your state’s motor carrier office.
Keeping it active
390.19T(b): the report must be filed before operations begin and updated every 24 months. If the next-to-last digit of the USDOT number is odd, the update is due in odd-numbered years; if even, in even-numbered years. Under 390.19T(b)(4) a carrier that misses the biennial update is subject to civil penalties "and deactivation of its USDOT Number." 390.19T(g) applies penalties to false or misleading information on the form.
Example. USDOT number 3456789: the next-to-last digit is 8, which is even, so the update is due in 2026, 2028 and so on.
Marking the vehicle
390.21T requires every self-propelled CMV to show:
- the carrier’s legal name or single trade name as listed on its MCS-150 ((b)(1));
- the number issued by FMCSA, "preceded by the letters USDOT" ((b)(2));
- if someone else’s name is on the truck, the operating carrier’s name and number preceded by "operated by" ((b)(3)).
Under 390.21T(c) the marking must appear on both sides, contrast sharply with the background, be readable in daylight from 50 feet while the vehicle is stationary, and be maintained that way. 390.21T(d) allows paint or a removable device such as a magnetic sign if it meets the same standard. There is a short-term rental exception in 390.21T(e) for rentals of 30 days or less, which allows the lessor’s name and USDOT number if the rental agreement carries the required details and is kept in the vehicle.
The MC number
The MC number is the docket number FMCSA assigns when it grants operating authority under Part 365. FMCSA’s own April 2026 notice calls these "the Motor Carrier (MC) and Freight Forwarder (FF) Docket Numbers." Under 385.301T(a), for-hire carriers must obtain operating authority before interstate operations, "unless providing transportation exempt from 49 CFR part 365 registration requirements."
So the dividing line is for-hire vs private:
- Private carrier (a company hauling its own products, such as a builder moving its own materials): USDOT number, no MC number.
- For-hire carrier of regulated freight: USDOT number and MC number.
- For-hire carrier of exempt commodities only: USDOT number; authority not required. 390.5T defines an exempt motor carrier as one engaged in transportation exempt from FMCSA economic regulation under 49 U.S.C. 13506, and adds that exempt carriers "are subject to the safety regulations."
- Property broker: broker authority (MC number) and a $75,000 surety bond or trust fund (387.307(a)).
The authority stays valid only while its filings stay on file. 387.301T(a)(1) says no certificate "shall be issued to such a carrier or remain in force" without the required insurance or bond on file, and 366.2T requires a current BOC-3. How to get the authority in the first place is covered step by step in how to get your own trucking authority, and process agents are listed in our BOC-3 agent directory.
Why there are two numbers
The two numbers come from two different jobs FMCSA does. Safety oversight covers every motor carrier running CMVs in interstate commerce, for-hire or not, so every one of them gets a USDOT number and carries it on the truck. Economic registration is narrower: FMCSA registers for-hire motor carriers of regulated commodities and of passengers under 49 U.S.C. 13902(a), freight forwarders under 13903 and property brokers under 13904, as its April 2026 Motus notice sets out. Those registrations are the "operating authority," and each has had its own docket number (MC, FF or MX).
Which do you need? Common cases
| Situation | USDOT | MC | Why |
|---|---|---|---|
| Owner-operator with own authority hauling general freight between states | Yes | Yes | Interstate for-hire, regulated freight (385.301T(a)) |
| Owner-operator leased on to a carrier | Runs under the carrier’s | Runs under the carrier’s | The carrier is the motor carrier; the lease follows Part 376 |
| Landscaping company taking its own 14,000 lb truck and trailer into a neighboring state for jobs | Yes | No | Private carrier with a CMV of 10,001 lb or more in interstate commerce |
| Hotshot pickup and trailer, 10,001 lb or more combined, hauling for customers across state lines | Yes | Yes | For-hire interstate with a CMV under 390.5T |
| Freight broker with no trucks | Registered with FMCSA | Broker authority | 49 U.S.C. 13904; $75,000 bond (387.307) |
| Carrier hauling placarded hazmat only within one state, needing a hazmat safety permit | Yes (Form MCS-150B) | No | 390.19T(a)(2) |
Being a private carrier does not mean lighter safety rules. 390.3T(a)(1) applies the safety regulations "to all employers, employees, and commercial motor vehicles that transport property or passengers in interstate commerce," for-hire or not. The private carrier simply skips the economic registration and its insurance filing.
Other fees on the Part 360 schedule
| Transaction | Fee | 360.3T(f) item |
|---|---|---|
| Application for operating authority (each type) | $300 | (1) |
| Name change of a carrier, broker or forwarder | $14 | (7) |
| Merger, transfer or lease of operating rights | $300 | (8) |
| Emergency temporary authority application | $100 | (6) |
| Petition for reinstatement of revoked authority | $80 | (52) |
The Motus notice lists name changes, address changes and reinstatements among the transactions registrants will complete in the new system.
Is the MC number being eliminated?
FMCSA has said for years that it wants a single identifier, and it is replacing its registration system with one called Motus. The status as of FMCSA’s Federal Register notice of 29 April 2026 (91 FR 23144) is:
- FMCSA "will continue to identify all regulated entities by a USDOT Number as the unique identifier."
- New USDOT number suffixes showing each type of registration held are "only visible in the system for ease of use at this time" and will not change formal agency documents. Suffixes are not required for marking vehicles.
- After stakeholder feedback, "the Phase II release of Motus will not include the implementation of safety registration, the elimination of MC/FF numbers, or changes to the Form BOC-3 filing process." FMCSA says it will take "a measured approach to implement these changes in later releases."
- FMCSA said it anticipated proposing a rule in spring 2026 to require Motus for all registrants and eliminate the old paper forms.
In plain terms: as of that notice, MC numbers remain in use and nothing requires carriers to stop using them. We found no later Federal Register document through 27 September 2026 that eliminates them. Any change should come through a published rule or notice, so check FMCSA’s registration pages and the Federal Register before relying on claims of a date.
Inactive, revoked and reinstated numbers
- USDOT number deactivated for a missed biennial update (390.19T(b)(4)): file the update to restore it.
- Authority revoked for missing insurance or BOC-3: the filings have to be put back on file and reinstatement requested. A petition for reinstatement of revoked authority carries an $80 fee (360.3T(f)(52)).
- New entrant registration revoked after a failed or refused safety audit: 385.329T allows re-application no sooner than 30 days after revocation, and a for-hire carrier whose authority was also revoked must re-apply for authority under Part 365. See the new entrant safety audit page.
- Voluntary suspension or revocation: FMCSA’s Motus notice lists requests to voluntarily suspend or revoke authority, or record a USDOT number as out of business, among the transactions carriers will complete in the new system.
Looking up a number
FMCSA publishes carrier registration and safety records online (the SAFER Company Snapshot), and its Motus notice says the public will be able to "search an entity’s registration record" in the new system. Look up your own record after each filing to confirm that the USDOT number, the authority, the insurance filing and the BOC-3 all show as you expect; brokers and shippers look at the same record before they give you freight.
Common mistakes
- Assuming a USDOT number alone lets you haul for-hire. It does not; authority is a separate grant.
- Assuming you do not need a USDOT number because you do not need a CDL. The CMV line for USDOT purposes is 10,001 pounds, not 26,001.
- Putting a trade name on the truck that is not on the MCS-150. 390.21T(b)(1) ties the marking to the name on file.
- Operating under a leased-on carrier’s number after the lease has ended. Once you run on your own, the USDOT number (and authority, if for-hire) must be yours, and the truck’s marking must change to match.
- Letting a broker or shipper tell you an MC number is "active" without checking the insurance and BOC-3 filings behind it. Authority is only as good as the filings that keep it in force.
- Forgetting the biennial update because nothing changed. The update is due on the 24-month schedule regardless.