What Is an MCS-150 and When Do You Need to Update It?

Your USDOT number does not expire, but it can become inactive if required updates are not filed.

One of the most common reasons is failing to submit a required MCS-150 update. An inactive USDOT number can prevent you from operating legally.

This guide explains what the MCS-150 is, when you need to file it, and which changes require an update outside the regular biennial schedule.

What Is the MCS-150?

The MCS-150 is the form used to keep your carrier information up to date with the FMCSA. You file it when you first register. Then you update it on a set schedule. And whenever something about your operation changes.

The form captures:

1. Business name and physical address
2. Number of vehicles and drivers
3. Types of cargo you haul
4. Miles traveled
5. Operation type (for-hire, private, exempt)

FMCSA uses that data to maintain your carrier record, calculate your CSA safety scores, and flag carriers for audits and enforcement.

Inaccurate information can affect your compliance record. And eventually it can affect your insurance premiums, audits, and position with shippers and brokers.

Who Has to File the MCS-150?

Anyone who has a USDOT number and operates in interstate commerce must file MCS-150.

The requirement covers:

1. Motor carriers - hauling freight or passengers across state lines
2. Owner-operators - running under your own authority
3. Freight forwarders - arranging interstate shipments
4. Brokers - matching carriers with shippers
5. Private carriers - moving your own goods interstate

When Do You Need to Update Your MCS-150?

Two situations trigger an MCS-150 filing. Both are mandatory.

1. The Biennial Update (Every Two Years)

Every carrier must file an updated MCS-150 once every 24 months on a set schedule. This is the Biennial Update.

Even if no information has changed, the Biennial Update is still required. If you recently submitted an update because your business information changed, you still need to file again on schedule.

Your filing window is determined by the last two digits of your USDOT number:

The last digit of your USDOT number sets the month:

Example: USDOT number ends in 42. The "4" is even → file in even years. The "2" → file in February. So this carrier's deadline is February of every even-numbered year.

You can confirm your filing schedule by checking your company snapshot in the FMCSA SAFER System.

Read more about the Biennial Update and what it covers: The Importance of Your Biennial Update (and How to File It).

2. Any Time Your Business Information Changes

Outside the biennial schedule, you must file an updated MCS-150 within 30 days of any of these changes:

1. Business name or legal entity change
2. Physical or mailing address change
3. Phone number or email change
4. Change in the number of vehicles or drivers
5. Change in cargo type or operation classification
6. Carrier goes out of business or ceases operations

FMCSA does not send reminders. That's your responsibility to track.

One thing carriers miss: if your vehicle count drops, update it. Your MCS-150 vehicle count feeds directly into your UCR fee bracket. An outdated vehicle count may result in paying a higher UCR fee than necessary.

If your fleet grows, update that too. An undercount during a CSA audit may create inconsistencies during compliance reviews.

What Happens If You Miss the Deadline?

Missing the biennial filing deadline can result in significant compliance consequences.

An inactive USDOT means you cannot legally move freight. Loads get cancelled, revenue stops, and reinstatement takes time.

The FMCSA also pulls outdated MCS-150 records into enforcement decisions. Inspectors and auditors use this data. Outdated information about your fleet size or mileage can create compliance mismatches during a roadside check or audit.

What Information Goes in the MCS-150?

The form is straightforward. Here's what you report:

Business details

1. Legal business name
2. Physical and mailing address
3. Phone number and email
4. EIN or SSN

Operation details

1. Operation type (for-hire carrier, private carrier, broker, freight forwarder)
2. Cargo type (general freight, household goods, hazmat, etc.)
3. Interstate or intrastate operation

Fleet details

1. Number of power units (trucks, tractors)
2. Number of drivers
3. Total miles traveled in the past 12 months

Mileage and vehicle count aren't just boxes to check. They directly influence how FMCSA scores your safety data. Get them right.

How to File the MCS-150 with DOT Compliance Support

Filing is free through FMCSA directly but errors in fleet size, mileage, or cargo classification can create compliance issues that are often more costly than the filing itself.

DOT Compliance Support handles the MCS-150 filing for you.

Step 1 - Submit Your USDOT Information

Go to dotcompliancesupport.com/biennial-update and enter your USDOT number.

Have this ready:

1. Current fleet size (power units)
2. Driver count
3. Miles traveled in the past 12 months
4. Any recent changes - new address, updated cargo type, fleet additions or reductions

Note anything that changed since your last filing. That's what needs updating.

Step 2 - Review and Validate

Your information gets checked for accuracy before anything goes to FMCSA.

If inconsistencies are identified in fleet size or mileage, they are reviewed before the filing is submitted. Errors here affect your CSA scores and your UCR fee bracket - both reviewed during audits and insurance evaluations.

This review helps identify common reporting errors before submission.

Step 3 - File and Confirm

Once the information has been verified, the MCS-150 is submitted to FMCSA. You receive a confirmation. Your USDOT number stays active.

Keep that confirmation. Log it with your compliance records alongside your annual inspection report, insurance certificate, and ELD records.

MCS-150 vs. MCS-150B vs. MCS-150C - What's the Difference?

Most carriers only deal with the standard MCS-150. If you haul radioactive materials, explosives over 55 lbs, or certain Division 1.5 explosives - the MCS-150B applies to you.

Keep Your MCS-150 Current with DOT Compliance Support

Your USDOT number is your operating identity. An up-to-date MCS-150 keeps it active.

Track your biennial filing deadline carefully, as FMCSA does not send reminder notices. Set a calendar alert 60 days out. That's enough time to review your numbers, update any changes, and file without rushing.

Changed your address, fleet size, or cargo type recently? File the update within 30 days. Submit the update as soon as the required changes occur.

Need help managing your Biennial Update, UCR registration, or BOC-3? DOT Compliance Support handles the filings so you can stay focused on operations.