Every motor carrier with a USDOT number should understand the MCS-150 biennial update schedule.
The deadline is based on the final two digits of the company’s USDOT number. However, recent filings, changes in operations, and registration status can affect what action is actually needed.
In 2026, another important factor applies: FMCSA temporarily suspended enforcement of certain biennial updates during its transition to Motus.
This guide explains how to calculate the normal deadline, determine whether a previous filing counts, and maintain accurate company information.
What Is an MCS-150 Biennial Update?
The MCS-150 is the Motor Carrier Identification Report used to maintain information associated with a company’s USDOT registration.
It includes the legal business name, addresses, contact information, operating classification, cargo types, power units, drivers, and mileage.
FMCSA uses this information for registration administration and safety oversight.
The update does not renew operating authority or replace other compliance requirements.
How Often Must You Update the MCS-150?
Under the normal federal rule, entities subject to the biennial update requirement must update their registration information every two years.
The update is required even when the information has not changed.
The normal filing deadline is determined by the USDOT number.
Separate updates may be necessary when the business changes its information.
How Do You Calculate Your MCS-150 Deadline?
The last digit of the USDOT number identifies the filing month.
| Last USDOT digit | Filing month |
| 1 | January |
| 2 | February |
| 3 | March |
| 4 | April |
| 5 | May |
| 6 | June |
| 7 | July |
| 8 | August |
| 9 | September |
| 0 | October |
The second-to-last digit identifies the filing year.
An odd second-to-last digit means odd-numbered years. An even digit means even-numbered years.
The normal deadline is the last day of the assigned month.
Example: USDOT Number Ending in 26
The final digit is 6, so the filing month is June.
The second-to-last digit is 2, which is even.
The normal biennial schedule therefore falls in June of even-numbered years, including June 2026 and June 2028.
The June 2026 deadline is covered by FMCSA’s temporary enforcement suspension announced in September 2026.
Example: USDOT Number Ending in 57
The final digit is 7, so the filing month is July.
The second-to-last digit is 5, which is odd.
The normal filing schedule falls in July of odd-numbered years.
For this example, the scheduled years include 2025 and 2027.
Does a Previous MCS-150 Filing Count?
FMCSA considers a qualifying MCS-150 or MCS-150C update completed within the 12 months immediately preceding the scheduled due date to satisfy that biennial update.
For example, a carrier with an October 2026 due date that completed a qualifying update in February 2026 may already have satisfied that scheduled update.
The company should verify the accepted filing date and its record.
A recent filing does not permanently change the assigned biennial month or year.
Do You Need to File if Nothing Changed?
Under the normal rule, yes.
The biennial requirement is separate from whether the business has changed its address, fleet size, or operations.
However, FMCSA’s temporary 2026 enforcement suspension must be considered for covered due dates.
A carrier should distinguish the underlying filing obligation from current enforcement activity.
What If Your Company Information Changes?
FMCSA states that registration information must be updated within 30 days of a change.
Examples include changes to the business address, telephone number, email address, reported power units, or operating information.
Some legal-name, ownership, or entity changes may require additional documentation or a different registration action.
The company should use the appropriate official process.
What Changed in September 2026?
FMCSA temporarily suspended enforcement of biennial updates and related USDOT-number inactivation for registrants whose updates were due on or after June 1, 2026.
The agency announced the relief while supporting the transition to Motus.
Affected registrants receive additional time and will not have their USDOT numbers inactivated solely for failing to complete the covered biennial update during the suspension.
FMCSA has said it will provide further guidance.
Does the Suspension Cancel the Filing Requirement?
No.
The underlying biennial update rule remains in place.
The suspension concerns specified enforcement actions and deadlines.
It does not excuse inaccurate registration information or unrelated compliance violations.
What If Your Deadline Was Before June 2026?
Do not assume the temporary suspension applies retroactively.
A carrier with an earlier missed deadline should verify its actual USDOT status and filing history.
If the number is inactive, determine the reason and follow FMCSA’s appropriate reactivation instructions.
What Happens If You Miss a Required Update?
Under the normal enforcement framework, missing a required biennial update can result in USDOT-number inactivation and potential civil penalties.
However, FMCSA’s current suspension protects the specified updates due on or after June 1, 2026 from related inactivation during the relief period.
A missed deadline should not automatically be described as an inactive registration.
Always check the actual record.
How Do You Verify Your USDOT Status?
Use official FMCSA registration search resources.
Confirm the USDOT number, legal entity, status, and available company information.
Compare the public record with internal business documents.
If something is incorrect, identify the appropriate update procedure.
How Do You Submit an MCS-150 Update?
FMCSA provides official filing instructions for the MCS-150 series.
Current registration guidance identifies online account options and support-ticket submissions, depending on the type of transaction.
The appropriate form may be MCS-150, MCS-150B, or MCS-150C.
There is no federal government processing fee for a routine biennial update.
Does Motus Change the Requirement?
FMCSA launched Motus on May 19, 2026.
Motus modernizes registration administration and company-account management.
It does not permanently eliminate the underlying biennial update requirement.
Use current FMCSA guidance for available filing methods during the transition.
Can MCS-150 Information Affect Safety Data?
Yes.
FMCSA uses reported power units and vehicle miles traveled in certain safety measurement calculations.
An inaccurate fleet count or mileage figure can affect how the company’s available data is interpreted.
However, updating registration information does not automatically erase valid inspections, crashes, or violations.
Does MCS-150 Replace Operating Authority?
No.
A USDOT number identifies the regulated business.
Certain interstate for-hire carriers also need separate operating authority.
A biennial update does not activate revoked authority or satisfy insurance filing requirements.
Does MCS-150 Renew UCR?
No.
Unified Carrier Registration is a separate annual requirement for covered interstate transportation entities.
The 2027 UCR registration season opened October 1, 2026.
A completed MCS-150 update does not pay UCR.
Frequently Asked Questions
How can I tell when my MCS-150 is due?
Use the final two digits of your USDOT number to identify the normal month and odd- or even-numbered year.
Does a filing from last year count?
A qualifying filing within the 12 months before the scheduled due date can satisfy that update.
Must I file if my information has not changed?
Yes, under the normal biennial rule, subject to current enforcement relief.
Are USDOT numbers being deactivated for missed 2026 updates?
FMCSA temporarily suspended related inactivation for updates due on or after June 1, 2026.
Is a routine MCS-150 update free?
FMCSA charges no government processing fee for a routine biennial update.
Does MCS-150 satisfy all DOT compliance requirements?
No. Driver, vehicle, authority, insurance, and other obligations remain separate.
Understand Your Filing Schedule and Current FMCSA Guidance
The MCS-150 deadline follows a predictable schedule, but prior filings, company changes, and temporary agency relief can affect the appropriate next step.
MCS-150 Biennial Update Filing Services – Fmcsa.com provides private compliance education and assistance for motor carriers and other regulated transportation businesses.
Visit MCS-150 Biennial Update Filing Services – Fmcsa.com or call (800) 454-2522 for help understanding MCS-150 requirements and related federal compliance obligations.
MCS-150 Biennial Update Filing Services – Fmcsa.com is a private compliance resource and is not the Federal Motor Carrier Safety Administration or an official government website. Private assistance is optional.
