Who this is for: motor carriers, owner-operators, small fleets, dispatch assistants
MCS-150 Biennial Update — FMCSA Registration Requirement
All FMCSA-registered carriers must file an MCS-150 update every 24 months, even if no information has changed. Missing the due date causes FMCSA to deactivate the USDOT number. Operating on a deactivated USDOT number is a federal violation. Filing is free through FMCSA's Unified Registration System.
What Is the MCS-150 Biennial Update?
The MCS-150 is the Motor Carrier Identification Report — the form used to register with FMCSA and provide information about your carrier operation. Federal regulations require all registered motor carriers to update their MCS-150 information every 24 months (biennial update). The update must be submitted even if none of the carrier's information has changed.
When Is the Update Due?
The due date for the biennial update is determined by the carrier's USDOT number. FMCSA staggers due dates based on the last two digits of the USDOT number or the legal business name. Carriers can check their specific due date on the FMCSA registration portal. Updates may be filed up to 6 months before the due date without resetting the 24-month clock. Filing must occur within the due-date month to avoid deactivation.
Consequences of Missing the Update
If a carrier fails to submit the biennial update by the due date, FMCSA will deactivate the carrier's USDOT number. Operating on a deactivated USDOT number is a federal violation and can result in: roadside out-of-service orders, civil penalties, loss of operating authority, and difficulty obtaining insurance or contracts. Reactivation requires filing the overdue MCS-150 update, but operating during the deactivated period is still a violation.
How to File the Update
The biennial update is filed online through FMCSA's Unified Registration System (URS) at the FMCSA registration portal. The update requires current information about: legal business name and address, contact information, type of operation (private/for-hire, commodity type), number of drivers, number of vehicles, and hazmat activity. There is no fee to file the biennial update.
Inactivating a USDOT Number
If you have stopped operating CMVs under your USDOT number, you may choose to inactivate it voluntarily through the MCS-150 process rather than letting it lapse. Voluntary inactivation is cleaner from a regulatory standpoint than having a number forcibly deactivated by FMCSA. If you resume operations, you can reactivate an inactivated number by filing a new MCS-150.
Keeping the update on your compliance calendar
FMCSA sends reminder notices before the biennial due date, but don't rely on those as your primary reminder. Add the biennial due date to your compliance calendar and flag it 60 days in advance. The USDOT number is the foundation of your regulatory identity with FMCSA — brokers, shippers, and insurance companies look it up routinely. An inactive number creates problems that reach further than just a roadside stop: it can affect load acceptance, insurance verification, and operating authority status before you even know the number went inactive.
Frequently Asked Questions
How do I find my biennial update due date?
Log in to the FMCSA Unified Registration System (URS) with your USDOT number. Your registration record shows the current due date for the MCS-150 biennial update. FMCSA also sends reminder notices, but carriers should track their own deadlines rather than relying on reminders.
Does my operating authority (MC number) also require a biennial update?
The biennial update applies to the USDOT registration (MCS-150). Operating authority is maintained separately, but an inactive or deactivated USDOT number will affect operating authority as well. Carriers with active MC numbers must also keep their USDOT registration current.
What information do I need to have ready before filing?
Have ready: your USDOT number and PIN (or access to your online account), current fleet size (number of power units and trailers), driver count, type of operation, cargo type, and any hazardous materials activity. If your business information has changed (name, address, ownership), be prepared to update those fields.