Both numbers are issued by the Federal Motor Carrier Safety Administration, both stay with the carrier for life, and both are filed during the same FMCSA registration application (through the Motus system since May 14, 2026). They are not interchangeable. The USDOT is mandatory for almost every commercial vehicle that crosses a state line; the MC number is a layer on top required only when the carrier transports regulated commodities or passengers for compensation.
Most for-hire interstate trucking companies need both. Private carriers, intrastate-only carriers, and many specialized exempt operations need only the USDOT. The USDOT vs MC authority guide walks through the full applicability matrix.
How do USDOT Number and MC Number compare?
| Attribute | USDOT Number | MC Number |
|---|---|---|
| Issuing rule | 49 CFR Part 390 (USDOT registration) | 49 USC §13902 + 49 CFR Part 365 (operating authority) |
| What it identifies | The motor carrier as a safety-regulated entity | A specific authority type - common, contract, broker, or freight forwarder |
| Cost | Free | $300 per authority type, paid through Pay.gov |
| Activation requirements | Issued upon application submission for vehicles meeting GVWR thresholds | Requires BOC-3 + BMC-91 insurance on file before FMCSA grants the authority |
| Activation timeline | Issued through FMCSA registration in Motus | FMCSA controls the timing; granted after the 10-day protest period once BOC-3 + insurance are on file (due within 20 days of the Register notice) |
| Recurring obligations | MCS-150 biennial update under 49 CFR §390.19T | Continuous insurance + valid BOC-3; no recurring filing of its own |
| Required for intrastate-only carriers? | Federally optional; many states require it for in-state CDL operations | No - interstate for-hire only |
| Required for private carriers (own goods)? | Yes if interstate and over GVWR threshold | No - private carriers do not need MC |
When should you choose USDOT Number or MC Number?
When to choose USDOT Number
Anyone operating a commercial vehicle on US roads above the GVWR thresholds
Required for interstate carriers, hazmat-placardable shipments at any weight, and 9+ passenger commercial vehicles for hire. Intrastate carriers in 38 states plus Puerto Rico, including California and Texas, also need a USDOT under state law. Use the USDOT cost calculator to estimate your first-year fees.
When to choose MC Number
For-hire interstate carriers, brokers, and freight forwarders
Required when the operation is paid to transport regulated freight or passengers across state lines. Private fleets that haul their own goods do not need MC. Brokers and freight forwarders need MC even though they never touch the cargo. See the DOT number cost guide for the full breakdown.
What's the next step in your filing?
Filing for new authority? Use the USDOT cost calculator to model the year-one numbers, then pair with the DOT number cost & process guide for timing.
Frequently asked questions
Do I get my USDOT and MC at the same time?
Yes. FMCSA issues both from a single application (filed through the Motus registration system since May 14, 2026). The USDOT is issued right away; FMCSA controls when the MC authority is granted: after the 10-day protest period, once your BOC-3 and BMC-91 insurance are on file.
Can I haul freight with only a USDOT?
Only if you are intrastate, hauling exempt commodities, or running a private fleet hauling your own goods. Interstate for-hire carriers must have an active MC number under 49 USC §13902.
What about MX and FF numbers?
MX is the Mexico-domiciled carrier counterpart to USDOT. FF is a freight-forwarder authority docket. Both follow the same FMCSA application process but answer different statutory questions.
Is the MC number visible on my truck?
Federal regulation 49 CFR §390.21 requires the legal name and USDOT number on both sides of the power unit. The MC number is not required on the truck but most fleets paint it next to the USDOT for identification.
Can my MC be revoked while my USDOT stays?
Yes - and this happens frequently. Insurance lapses or an unsatisfactory safety rating can lead FMCSA to revoke the MC authority while the USDOT identifier remains tied to your safety record. A missed MCS-150 update is different: it can deactivate the USDOT number (49 CFR 390.19T(b)(4)).
Authoritative citations
Related guides
USDOT vs MC Authority
When each identifier applies and how the two work together for interstate carriers.
Read the USDOT vs MC Authority guideMC vs DOT Number Explained
Plain-English comparison of FMCSA’s two carrier identifiers and when each applies.
Read the MC vs DOT Number Explained guideDOT Number Cost & Process
What a USDOT number actually costs, plus the timeline from application to ACTIVE.
Read the DOT Number Cost & Process guide