MCS-150
MCS-150 is the motor carrier identification report. It is also the form name most people still reach for when their biennial update is due — and the section of the regulation that governs that update names a different one.
The update rule names Form MCSA-1, not MCS-150
49 CFR 390.201(d)(3)(i) reads: “Persons assigned a USDOT Number must file an updated Form MCSA-1, the URS online application, every 24 months”.
Across the whole of 390.201 — the section that establishes who must register and on what schedule — Form MCSA-1 is named fourteen times and MCS-150 is not named at all.
49 CFR 390.201(d)(3)(i)
Where each form appears
MCS-150 has not vanished from the regulation. It appears in a different place, doing a different job.
| Section | What it governs | MCSA-1 | MCS-150 |
|---|---|---|---|
| 390.201 | USDOT registration, the general rule | 14 | 0 |
| 390.19 | Mexico-domiciled carriers | 0 | 7 |
| 390.21 | Marking of vehicles | 1 | 1 |
Counts of how many times each form is named in the section text, taken from the Electronic Code of Federal Regulations.
390.19 — where MCS-150 is named seven times — applies to Mexico-domiciled carriers seeking authority to operate beyond the border commercial zones. That is a narrower rule than its title suggests, and it is worth knowing if you arrived here from a search that assumed MCS-150 was the general form.
390.21, the vehicle marking rule, names both: the marking must show the legal name or single trade name “as listed on the Form MCSA-1, the URS online application, or the motor carrier identification report (Form MCS-150) … in accordance with § 390.201 or § 390.19, as appropriate”. The regulation carries both because both routes exist.
When the update is due
Whichever form you file, the timing comes from your USDOT number rather than from your registration date. The last digit sets the month — a number ending in 3 files by the last day of March — and the next-to-last digit sets the year, odd digits in odd-numbered years.
The full schedule and the marking requirements are in the USDOT number guide.
What this page does not tell you
It describes what the regulation names. It does not describe what FMCSA’s systems currently accept, whether a particular form is still processed, or what happens if you file the wrong one. Those are questions about a live system, and the answer belongs to FMCSA rather than to a page that has read the rule.
Before filing anything, check with FMCSA directly. A missed biennial update has consequences, and no summary — including this one — is worth relying on over the agency that operates the system.
Source: 49 CFR 390.19, 390.21 and 390.201, retrieved from the Electronic Code of Federal Regulations at ecfr.gov. A reference, not legal advice.
Related: look up a USDOT record or read which FMCSR part covers what.