Glossary · Operating Authority & Compliance
MCS-150.
Biennial update form filed with FMCSA to refresh a carrier's operational data and keep DOT/MC authority active.
What it is
The MCS-150 — formally the "Motor Carrier Identification Report" — is the FMCSA form every USDOT-registered carrier files to update operational data. It captures fleet size, mileage, hazmat status, and contact information, and it is the data source FMCSA uses to populate the SAFER public lookup and CSA scoring inputs.
The filing is required biennially. The schedule is set by the second-to-last digit of the carrier's USDOT number, with the last digit determining the month — every carrier has a fixed update window built off its DOT#. The filing itself is free and is submitted online through FMCSA SAFER or via Login.gov. Carriers can also file ad-hoc updates whenever operational data changes — a new fleet size, a new hazmat designation, a new contact address.
Failure to file by the deadline triggers DOT deactivation, which voids operating authority and stops the carrier from legally hauling freight.
Why it matters for trucking finance
Lenders and factors pull DOT data via FMCSA SAFER as the first step of underwriting. An outdated MCS-150 means a stale DOT record, which lender systems flag as "not actively operating" — declining the application before it reaches a human reviewer.
An MCS-150 lapse triggers DOT deactivation, which voids operating authority and stops factoring instantly — every advance is gated on an active MC#. Insurance carriers also flag stale MCS-150 records during renewal pulls, which can push primary liability premiums up or trigger non-renewal. Track the biennial deadline the same way you track UCR and IRP renewals.
Related terms
- DOT Number (USDOT) — USDOT-issued registration number identifying any vehicle subject to federal safety oversight, including private and for-hire carriers.
- CSA Score (CSA) — FMCSA Compliance, Safety, Accountability program scoring system that rates carrier safety performance using roadside inspection and crash data.
- MC Number (MC#) — Federal operating authority number issued by FMCSA that identifies for-hire interstate motor carriers and brokers.
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