MCS-150 vs MCS-150B
MCS-150 is the standard FMCSA biennial registration update for general motor carriers, brokers, and freight forwarders under 49 CFR §390.19. MCS-150B is the hazardous-materials variant that adds shipper, principal-route, and security-plan disclosures required for carriers needing the §385.403 hazmat safety permit. Most carriers file MCS-150; only hazmat permit holders file MCS-150B.
Side-by-side comparison
| Dimension | MCS-150 | MCS-150B |
|---|---|---|
| Who files | All motor carriers, brokers, freight forwarders | Hazmat carriers needing §385.403 safety permit |
| Trigger | Holding a USDOT | Hauling hazmat in §385.403 quantities |
| Additional fields | Standard FMCSA carrier data | + shipper, principal route, security-plan attestation |
| Cycle | Biennial (24 months by USDOT digit) | Biennial (same digit-driven cycle) |
| Filing portal | FMCSA L&I | FMCSA L&I (same portal, different form) |
| FMCSA fee | $0 | $0 (hazmat permit fee is separate) |
When to file MCS-150
MCS-150 covers the vast majority of motor carriers. If your carrier does not transport hazardous materials in §385.403 permit-triggering quantities, MCS-150 is the right form. The biennial filing keeps the USDOT active and SAFER status current; without it, the USDOT goes Inactive and operating authority is functionally voided.
When to file MCS-150B
MCS-150B is required for carriers needing the §385.403 hazmat safety permit. The permit triggers when the carrier transports any of the seven hazmat categories listed in §385.403 — explosives, certain radioactive materials, large bulk hazmat shipments, etc. The 150B adds disclosures FMCSA needs to assess hazmat-specific safety risk.
Even hazmat carriers below the §385.403 threshold file regular MCS-150. The B variant is specifically about the hazmat safety permit overlay, not about hauling any hazmat at all.
Frequently asked questions
Which form do most carriers file?
MCS-150. The standard biennial update applies to general motor carriers and brokers. MCS-150B is only required for carriers transporting hazardous materials in quantities triggering 49 CFR §385.403 hazmat safety permit requirements.
Can I file MCS-150B online?
Yes — FMCSA accepts MCS-150B through the same L&I online portal as MCS-150. The hazmat form has additional fields (shipper info, principal routes, security-plan attestation), but the submission flow is the same.
Does the biennial schedule differ?
No — the same USDOT-digit-driven biennial cycle applies to both MCS-150 and MCS-150B. The 2nd-to-last digit sets the month and the last digit sets the year (odd vs even).
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