The MCS-150: The Filing That Makes Every Other FMCSA Data Point Reliable (Or Not)
When the MCS-150 is stale, every field in a carrier's FMCSA record becomes unverified. Here's why one filing date controls the reliability of everything else.
A broker checks a carrier's FMCSA record. It shows 15 power units, a physical address in Memphis, and a phone number they can call to verify. The carrier looks like a mid-size fleet based in Tennessee. The broker books the load.
The carrier actually has 4 trucks now, not 15. They moved to a new terminal in Little Rock 18 months ago. The Memphis phone number goes to a disconnected line. The MCS-150, which is the source of all three data points, was last filed 30 months ago. Everything the broker relied on came from a filing the carrier hasn't updated in over two years.
The MCS-150 is not a standalone compliance item. It's the form that populates the registration data in FMCSA's public database. Fleet size, physical address, mailing address, phone number, email, cargo types, mileage, and company officers all flow from this single filing. When the MCS-150 is current, those fields reflect the carrier's confirmed, self-reported operational profile. When the MCS-150 is overdue, every one of those fields is unverified and potentially outdated.
Here's what the MCS-150 filing date tells you:
| MCS-150 Age | What It Means | Impact on FMCSA Data Reliability | What to Do |
|---|---|---|---|
| Filed within 12 months | Current. Carrier recently confirmed their operational data. | High reliability. Fleet size, address, contact info are fresh. | Standard vetting. No additional steps needed for this data point. |
| Filed 12 to 24 months ago | Approaching due date but still within the compliance window. | Moderate reliability. Data is aging but within the required update cycle. | Acceptable. Note the filing date and compare data against what the carrier tells you. |
| Filed 24 to 30 months ago | Overdue. Carrier is out of compliance with FMCSA's biennial update requirement. | Low reliability. Fleet size, address, and contact info have not been confirmed in over 2 years. | Flag. Cross-reference every FMCSA field against what the carrier provides directly. Ask about the filing status. |
| Filed 30+ months ago | Significantly overdue. FMCSA may deactivate the carrier's DOT number. | Unreliable. Treat FMCSA registration data as unverified. | Elevate scrutiny on all vetting steps. The carrier's compliance posture is demonstrably weak. |
| No filing date shown | Either the carrier is brand new or the filing data isn't available. | No baseline. Registration data has never been confirmed through the biennial process. | Verify everything independently. |
What the MCS-150 Form Actually Captures
The MCS-150, officially called the "Motor Carrier Identification Report," is the biennial update form every registered motor carrier must file with FMCSA. It captures the operational profile that becomes the carrier's public FMCSA record.
The Fields That Flow From the MCS-150
Legal name and DBA. The carrier's registered legal name and any trade name (Doing Business As). These fields are what brokers use to verify carrier identity.
Physical and mailing addresses. The carrier's terminal address and correspondence address. Brokers use the physical address to evaluate the carrier's operating base, check for residential-vs-commercial location, and cross-reference against revoked carriers for chameleon detection.
Phone number and email. The primary contact information on file with FMCSA. This is the number brokers should use to independently verify a carrier's identity, especially when checking for carrier identity theft.
Company officers. The names of the carrier's principal officers. These names are what FMCSA uses to cross-reference officers across multiple DOT registrations for chameleon carrier detection.
Power units and drivers. The count of trucks/tractors and total drivers. Brokers use this to evaluate fleet size and flag discrepancies between what the carrier claims and what FMCSA shows.
Cargo types. The commodity classifications the carrier hauls (general freight, household goods, metal/steel, refrigerated, hazmat, etc.). This is what search tools use to match carriers to loads by commodity.
Annual mileage. The carrier's self-reported total annual mileage. This data point is used to calculate crash rates per million miles and to contextualize fleet-level safety data.
Carrier operation type. Whether the carrier operates as for-hire, private, exempt, or a combination. This determines what authority types the carrier needs.
Hazmat indicator. Whether the carrier transports hazardous materials. This affects insurance requirements, BASIC score categories, and inspection protocols.
What the MCS-150 Does NOT Capture
The MCS-150 does not include safety data (inspections, violations, crashes, BASIC scores), insurance filing information (that comes from the insurer's BMC-91 filing), or authority status (that's managed through the authority application process). The MCS-150 is the operational profile. The safety and financial data come from other sources.
When the MCS-150 Must Be Filed
Every motor carrier must file an updated MCS-150 every 24 months (biennially). The due date is determined by the last digit of the carrier's DOT number:
| Last Digit of DOT Number | Filing Due Month |
|---|---|
| 1 | January |
| 2 | February |
| 3 | March |
| 4 | April |
| 5 | May |
| 6 | June |
| 7 | July |
| 8 | August |
| 9 | September |
| 0 | October |
The filing year alternates between odd and even years based on the DOT number assignment. The carrier should verify their specific due date through FMCSA's system.
Carriers must also file an updated MCS-150 when certain changes occur between biennial filings: change of address, change of legal name, change in operation type, or change in cargo types.
The filing is free and can be completed online at FMCSA's portal in about 15 minutes.
Why the MCS-150 Filing Date Is a Vetting Signal
The MCS-150 filing date is visible on every carrier's FMCSA record. Check it with our MC/DOT lookup, which shows the filing date alongside power units, drivers, and registration status. Most brokers glance at it and move on. They shouldn't.
What a Current Filing Tells You
A carrier who filed their MCS-150 within the last 12 months has recently confirmed their operational profile with FMCSA. The fleet size, address, contact information, and cargo types on their FMCSA record reflect what the carrier reported recently. This doesn't guarantee the data is accurate (carriers can report incorrect information), but it means the carrier engaged with the compliance process recently, which is itself a signal.
What an Overdue Filing Tells You
A carrier whose MCS-150 was filed more than 24 months ago is out of compliance with a basic, free, 15-minute federal filing requirement. This is the lowest bar of regulatory compliance in trucking. It costs nothing. It takes a quarter of an hour. And the carrier didn't do it.
That failure tells you something about the carrier's compliance culture that goes beyond the filing itself. If a carrier doesn't maintain their MCS-150, what else aren't they maintaining? Are they tracking driver medical certificate expirations? Are they keeping vehicle maintenance records current? Are they monitoring their ELD compliance?
An overdue MCS-150 is not a safety violation. Nobody gets hurt because a fleet size was reported 28 months ago instead of 24. But it's one of the most reliable leading indicators of a carrier that treats compliance as an afterthought, and carriers that treat compliance as an afterthought produce violations across every category.
What a Very Overdue Filing (36+ Months) Tells You
At this point, FMCSA can and does deactivate DOT numbers for failure to file. A carrier operating with a 36-month-old MCS-150 is either not paying attention to their regulatory requirements or is no longer actively operating but hasn't formally closed their DOT registration. Either way, every data field in their FMCSA record is more than three years old and should be treated as unreliable.
A Worked Example: How a Stale MCS-150 Misleads a Broker
The carrier's FMCSA record shows:
- Legal name: Midwest Freight Services LLC
- Physical address: 1200 Industrial Blvd, Memphis, TN
- Power units: 22
- Total drivers: 28
- MCS-150 filed: August 2023 (30 months ago)
- Phone: (901) 555-0147
What the broker assumes: A 22-truck carrier based in Memphis with almost 30 drivers. A mid-size operation that's been around long enough to build a fleet.
What's actually true (based on what the carrier tells the broker when contacted):
- The carrier sold 14 trucks during the 2024 freight downturn and now operates 8 trucks
- They moved from Memphis to a smaller facility in Little Rock, AR in early 2025
- They have 10 drivers, not 28
- The Memphis phone number was disconnected when they moved
- The company officer listed on the MCS-150 retired and was replaced by his daughter
What the broker relied on: Every data field from a 30-month-old MCS-150 that doesn't reflect the carrier's current operation. The fleet size is overstated by 175%. The address is wrong. The contact information is dead. The company officer is different.
What should have happened: The broker checks the MCS-150 filing date (August 2023, 30 months ago), flags it as overdue, and cross-references every FMCSA field against what the carrier provides directly. The discrepancies between the FMCSA record and the carrier's current information would have been documented and explained. The broker would have the carrier's real profile, not their 2023 profile.
How the MCS-150 Connects to Other Vetting Steps
The MCS-150 filing date should inform how much you trust the data in every other part of the FMCSA record.
Fleet Size Evaluation
When you're assessing a carrier's fleet size and associated risk profile, the power units count comes from the MCS-150. If the filing is 28 months old, the fleet size could be dramatically different from what's shown. A carrier that reported 50 trucks in their 2023 MCS-150 might have 20 now, or 80. The number is stale.
Address Cross-Referencing
When you're checking for chameleon carrier indicators by comparing a carrier's physical address against revoked carriers, you're comparing against the MCS-150 address. If the filing is old, the carrier may have moved, and the address match (or lack thereof) is against their old location. For carriers with stale MCS-150 filings, verify the current address directly.
Contact Verification
When you're protecting against carrier identity theft by calling the FMCSA-listed phone number to verify the caller's identity, you're calling the MCS-150 phone number. If the filing is overdue and the carrier changed their number, the phone verification step fails because the number on file is disconnected. You'd need to verify the carrier's current contact information through other means.
Officer Cross-Referencing
Company officers listed on the MCS-150 are what FMCSA uses for chameleon carrier detection. If the filing is 30+ months old, the officers listed might no longer be involved in the carrier. A new officer who would trigger a chameleon flag (because they're connected to a revoked carrier) might not appear in the data until the MCS-150 is updated.
What Carriers Need to Know About the MCS-150
Filing Is Free and Takes 15 Minutes
The MCS-150 update is filed online through FMCSA's portal at portal.fmcsa.dot.gov. There is no filing fee. The form takes approximately 15 minutes to complete. There is no legitimate reason for a carrier to be overdue.
An Overdue MCS-150 Makes Brokers Nervous
Brokers who understand what the MCS-150 filing date means will flag your carrier as a compliance concern if the filing is overdue. Some brokerage compliance programs automatically reject carriers with MCS-150 filings older than 24 months. An overdue MCS-150 can cost you loads not because of any safety issue, but because it signals to brokers that you don't manage basic compliance.
FMCSA Can Deactivate Your DOT Number
Failure to file the MCS-150 biennial update can result in FMCSA deactivating your DOT registration. A deactivated DOT means you cannot legally operate. The deactivation isn't instantaneous (FMCSA processes these in batches), but it's a real consequence of a filing that takes 15 minutes and costs nothing.
Your Insurance and BASIC Scores Are Separate
Updating your MCS-150 does not affect your insurance filing (that's between you and your insurer) or your BASIC scores (those come from inspection data). The MCS-150 updates your registration profile: fleet size, address, contact info, cargo types, and mileage. These are the fields brokers see when they look you up.
The Filing Affects Your Profile Completeness Score
Carriers who use our carrier profile tool can see how their profile appears to brokers, including whether the MCS-150 is overdue. An overdue filing is flagged as a compliance issue that affects how brokers perceive the carrier.
Frequently Asked Questions
What is an MCS-150 form?
The MCS-150 is the Motor Carrier Identification Report, a federally required filing that every registered motor carrier must update with FMCSA every 24 months (biennially). It reports the carrier's fleet size, address, contact information, cargo types, mileage, company officers, and operation type. This data populates the carrier's public FMCSA record.
How often do you have to file the MCS-150?
Every 24 months (biennially). The specific due month depends on the last digit of the carrier's DOT number (1 = January, 2 = February, etc.). Carriers must also file an updated MCS-150 when they change their address, legal name, operation type, or cargo types between biennial filings.
What happens if you don't file the MCS-150?
FMCSA can deactivate the carrier's DOT registration, which means the carrier cannot legally operate. Before deactivation, the carrier's FMCSA record becomes increasingly stale, with fleet size, address, and contact information potentially outdated by years. Many brokers flag or reject carriers with MCS-150 filings older than 24 months.
How do I check when a carrier last filed their MCS-150?
The MCS-150 filing date appears on the carrier's FMCSA record. Use our MC/DOT lookup, which shows the filing date alongside registration status, power units, and drivers. If the filing date is more than 24 months ago, the carrier is overdue and the registration data may not reflect their current operation.
Does the MCS-150 affect my CSA score?
No. The MCS-150 updates your registration profile (fleet size, address, contact info). Your CSA/BASIC scores come from roadside inspection data and crash reports, which are separate systems. Updating your MCS-150 will not change your BASIC percentiles. However, an overdue MCS-150 is a compliance signal that brokers check alongside BASIC scores when evaluating carriers. Read our CSA score improvement guide for what actually moves your BASIC scores.
Is there a fee to file the MCS-150?
No. The MCS-150 update is free. It's filed online through FMCSA's portal and takes approximately 15 minutes. There is no cost at any point in the process.
Can I file the MCS-150 online?
Yes. The MCS-150 is filed through FMCSA's online portal at portal.fmcsa.dot.gov. You'll need your DOT number and PIN to access the system. The online filing is the fastest method and produces the quickest update to your FMCSA record.
Why do brokers care about the MCS-150 filing date?
Because the MCS-150 is the source of the registration data brokers use during vetting: fleet size, address, contact information, and cargo types. When the filing is current, that data is recently confirmed. When the filing is overdue, every one of those fields becomes unverified and potentially outdated. An overdue MCS-150 also signals to brokers that the carrier doesn't prioritize basic compliance, which raises questions about their compliance in other areas. Read our carrier onboarding guide for how the MCS-150 filing date fits into the onboarding process.
Bottom Line
The broker in the opening scenario made decisions based on a 22-truck fleet in Memphis. The carrier actually operates 8 trucks out of Little Rock. The fleet size was wrong. The address was wrong. The phone number was dead. Every incorrect data point came from the same place: an MCS-150 that was filed 30 months ago and never updated.
The MCS-150 filing date is one number. But it controls the reliability of every other registration field in the carrier's FMCSA record. Check the date before you trust the data. And if you're a carrier reading this with an overdue filing, stop reading and go update it. It's free. It takes 15 minutes. And every broker who looks you up between now and when you file is seeing a version of your company that no longer exists.