MCS-150 Biennial Update Requirements: Keep Your FMCSA Registration Active (2026)
Quick Answer
Your MCS-150 filing schedule is determined by the last digit of your USDOT number and whether you registered in an even or odd year. Look up your current filing due date by searching your USDOT number in the FMCSA Company Snapshot at safer.fmcsa.dot.gov. The snapshot will show your USDOT number status and your most recent MCS-150 filing date, from which you can calculate when the next biennial update is due.
Every active motor carrier must file the MCS-150 Motor Carrier Identification Report every two years or face automatic USDOT number deactivation — and operating with a deactivated number carries penalties of up to $16,550 per day. The filing is straightforward, the schedule is predictable, and the consequences of missing it are severe enough that it belongs on every carrier's compliance calendar. This guide explains the complete biennial update requirements under 49 CFR 390.19, the schedule based on your USDOT number, and how to reactivate a deactivated registration.
Every 2 yrs
MCS-150 filing frequency
Last digit
USDOT number determines your schedule
30 days
To update after any change
Deactivation
Consequence of missing the filing
In This Guide
What Is the MCS-150 and Who Must File
The MCS-150 — officially the Motor Carrier Identification Report — is the foundational registration document for interstate motor carriers in the United States. When a new carrier registers with FMCSA and receives a USDOT number, they complete an initial MCS-150 as part of the registration process. From that point forward, every carrier must update the MCS-150 every two years to confirm they are still actively operating and to keep their company information current in FMCSA's database.
The authority for the biennial update requirement comes from 49 CFR § 390.19, titled "Motor carrier and intermodal equipment provider identification reports." The regulation requires that every motor carrier that operates in interstate commerce and every hazardous materials shipper who must register with FMCSA file the MCS-150 biennially. This includes:
Must File MCS-150
- For-hire interstate motor carriers (any cargo type)
- Private carriers transporting property in interstate commerce
- Carriers of passengers in interstate commerce
- Hazardous materials shippers with USDOT requirements
- Owner-operators with their own USDOT authority
- Carriers domiciled in Canada or Mexico operating in the US
Special Situations
- Intermodal equipment providers file MCS-150B (separate form)
- Owner-operators leased to a carrier may file under the carrier's authority — check your lease agreement
- Carriers who have ceased operations must still update MCS-150 to show inactive status
- New carriers must file MCS-150 before beginning operations
The MCS-150 is not just an administrative formality. FMCSA uses the data to populate your carrier profile in the FMCSA SAFER system, which is publicly visible and accessed by shippers, brokers, insurance underwriters, and state enforcement agencies. Inaccurate or outdated MCS-150 data creates discrepancies that can trigger scrutiny during audits and underwriting reviews.
After FMCSA's October 2025 elimination of the MC number as a separate identifier for most property carriers, the USDOT number is now the sole federal registration identifier used for MCS-150 purposes. Carriers who operated under both numbers previously continue under their existing USDOT number, with all MCS-150 filings tied to that number.
How the MCS-150 Connects to the New Entrant Safety Audit
New motor carriers are subject to a New Entrant Safety Audit within 12 months of beginning operations, as required under 49 CFR Part 385, Subpart D. The MCS-150 initial filing triggers this audit cycle. FMCSA uses the contact information and officer data from your MCS-150 to reach out and schedule the audit — which is another reason accurate and current MCS-150 data is essential from day one.
The New Entrant Safety Audit evaluates whether the carrier has a basic safety management system in place across six compliance factors: driver qualifications, hours of service, driver wellness, controlled substances and alcohol testing, vehicle inspection and maintenance, and accident recordkeeping. Carriers who fail the audit or fail to submit corrective action documentation lose their new entrant registration. Maintaining an accurate MCS-150 ensures FMCSA can schedule and conduct the audit within the required window — carriers who are unreachable because their MCS-150 contact information is wrong can have their new entrant registration revoked for non-responsiveness.
Key Timeline for New Carriers
File initial MCS-150 through FMCSA Portal. Obtain USDOT number. Secure operating authority (if for-hire), insurance, BOC-3 process agent. File UCR.
New Entrant Safety Audit conducted. Must pass or submit acceptable corrective action plan. Be reachable at MCS-150 contact information.
First biennial MCS-150 update due. Schedule determined by USDOT last digit and initial registration year. Monitor your FMCSA Company Snapshot to confirm due date.
Filing Schedule: Finding Your Two-Month Window
It is worth noting that the MCS-150 is distinct from the UCR (Unified Carrier Registration), which is an annual fee-based registration required under a separate federal statute. The MCS-150 is a free filing that updates your carrier profile data; the UCR is a separate annual payment requirement. Both must be satisfied, but they are administered differently and have different deadlines and consequences.
New Carrier MCS-150 Requirement
New motor carriers must file an MCS-150 as part of the initial USDOT number registration process — before beginning operations. The initial MCS-150 establishes your carrier profile and triggers the new entrant safety audit requirement. Within 12 months of beginning operations, new carriers are subject to a New Entrant Safety Audit, which FMCSA uses to verify that the carrier has a basic safety management system in place. The biennial update schedule then begins from your initial registration.
FMCSA assigns each motor carrier a specific two-month filing window for their biennial MCS-150 update. The window is determined by the last digit of your USDOT number. Each digit maps to a specific two-month period. Carriers file in their assigned window during alternating years — either even years or odd years — based on when they originally registered with FMCSA.
| Last Digit of USDOT# | Filing Window (Months) | 2026 Due? | 2027 Due? |
|---|---|---|---|
| 1 or 7 | January / February | Depends on registration year | Depends on registration year |
| 2 or 8 | March / April | Depends on registration year | Depends on registration year |
| 3 or 9 | May / June | Depends on registration year | Depends on registration year |
| 4 or 0 | July / August | Depends on registration year | Depends on registration year |
| 5 | September / October | Depends on registration year | Depends on registration year |
| 6 | November / December | Depends on registration year | Depends on registration year |
The two-month window gives carriers flexibility — you can file on day one of your window or day fifty-nine — but the filing must be submitted and processed before the end of the second month. FMCSA does not provide a grace period; if the window closes and no filing is on record, deactivation is automatic.
The alternating-year part of the schedule is where most carriers get confused. Here is how to determine your specific year: check your last MCS-150 filing date in the FMCSA Company Snapshot at safer.fmcsa.dot.gov. If your last filing was in 2024, your next filing is in 2026. If your last filing was in 2025, your next filing is in 2027. Your two-month window is always the same months — only the year alternates.
Example: Finding Your Due Date
Carrier ABC Transport has USDOT number 3456789. The last digit is 9, which maps to a May/June filing window. Their last MCS-150 filing was June 2024. That means their next biennial update is due during May or June 2026. They should aim to file in early May to avoid any processing delays and to leave time to correct any errors before the window closes at the end of June.
To confirm your own deadline: Go to safer.fmcsa.dot.gov → enter your USDOT number → look for "MCS-150 Form Date" in your Company Snapshot. Add two years to find your next filing year, then use your USDOT last digit to confirm the two-month window.
FMCSA sends reminder notices by mail to the address on file with FMCSA — which is another reason keeping your address current with timely MCS-150 updates is important. If your address is outdated, you will not receive the reminder. But FMCSA is clear: non-receipt of a reminder notice is not a defense for non-compliance. The filing obligation exists independent of whether you received a notice.
How to File the MCS-150 Update
Filing the MCS-150 biennial update is one of the simpler compliance tasks in the federal motor carrier regulatory framework — the process itself is not burdensome if you do it on time. The difficulty comes from forgetting it exists until after your USDOT number has been deactivated.
Navigate to the FMCSA Portal
Go to portal.fmcsa.dot.gov. This is the official FMCSA online filing portal. Log in with your FMCSA Portal account credentials. If you do not have a Portal account, create one using your USDOT number and the company PIN you received when you originally registered — if you do not have the PIN, you can request a new one through the portal.
Select "File MCS-150"
From the portal dashboard, select the option to file or update your MCS-150. The portal will pre-populate the form with your current information on file with FMCSA. Review each field carefully — do not assume the pre-populated data is still accurate. This is your opportunity to correct outdated information at the same time you satisfy the biennial update requirement.
Review and Update All Fields
Go through every section of the form: company name, principal business address, phone number, officers and owners, number of CMVs operated, number of drivers employed, types of cargo carried, and hazmat operations status. Even if nothing has changed, you must still review and confirm each field before submission.
Certify and Submit
The person submitting the MCS-150 must be an authorized company official — typically an officer, owner, or person with authority to legally bind the company. They must certify that the information is accurate to the best of their knowledge. Submission is electronic through the portal; you will receive a confirmation number that documents your timely filing. Save this confirmation.
Verify the Update Processed
After 24-48 hours, check your FMCSA Company Snapshot at safer.fmcsa.dot.gov to confirm the MCS-150 filing date has updated and your USDOT status still shows as Active. If the status remains unchanged after 72 hours, contact FMCSA directly — processing delays do occasionally occur and you do not want to be deactivated due to a technical issue with an on-time filing.
Are Your Fleet's Docs Current?
Free 3-minute check shows exactly which medical cards, CDLs, and DQF docs are expired or at risk. No signup. No email. Just answers.
What Information Gets Updated on the MCS-150
The MCS-150 collects a standardized set of information about your carrier operations. Understanding what each field covers helps you approach the biennial update as a genuine review of your registration data — not just a box-checking exercise. FMCSA auditors compare MCS-150 data against other sources, and material discrepancies are cited during compliance reviews.
Company Information
- Legal company name
- DBA (doing business as) name
- Principal business address
- Mailing address (if different)
- Business phone number
- Business email address
- EIN (Employer Identification Number)
Operations Data
- Number of power units (trucks)
- Number of trailers
- Number of CDL drivers employed
- Number of non-CDL drivers
- Carrier type (for-hire / private)
- Operation type (interstate / intrastate)
- Cargo type classifications
Officers and Ownership
- Principal officers (name, title)
- Owners (name, percentage)
- Hazardous materials status
- Passenger operations (if any)
- Operating authority numbers
- Safety contact information
- Certifying officer signature
Cargo Type Classifications That Trigger Additional Obligations
The cargo type you select on the MCS-150 is not just a label — it determines which regulatory requirements apply to your operations. Carriers who haul certain cargo types are subject to additional federal rules beyond the standard FMCSA Part 390-399 regulations. Getting this right on the MCS-150 is essential for both compliance and audit preparedness.
| Cargo Type | Additional Regulatory Obligations |
|---|---|
| Hazardous Materials | 49 CFR Parts 171-180 (HazMat regulations), HazMat registration fees, additional driver training and endorsements, emergency response planning |
| Household Goods | 49 CFR Parts 371, 375 (HHG regulations), additional consumer protection disclosures, arbitration program requirement, estimate and bill of lading requirements |
| Passengers | Enhanced insurance minimums, vehicle inspection requirements specific to passenger operations, additional driver qualification requirements |
| Agricultural Commodities (exempt) | Potential exemption from certain operating authority requirements; verify exemption scope before claiming; some exemptions do not apply when crossing state lines with non-exempt cargo on the same trip |
| Oil Field Equipment | May involve hazmat if associated fluids are transported; oversize/overweight permits if equipment exceeds standard limits; state-specific permit requirements |
Two fields require particular attention during the biennial update because they affect how FMCSA calculates your safety metrics:
Two Fields That Affect Your CSA Scores
Power units (number of trucks): FMCSA uses this number to calculate your inspection and violation rates in the Safety Measurement System (SMS). If you understate your fleet size, your violation rate per inspection looks artificially high — which can push you into intervention territory even when your actual performance is reasonable. If you overstate it, your rates look artificially low. Report the accurate average number of power units operated during the period.
Number of drivers: Similarly, driver count affects how driver-related violations are normalized for comparison purposes. Carriers who have added or reduced drivers since their last filing should update this number carefully, using the count of CDL drivers employed at the time of filing.
Deactivation Consequences and Penalties
FMCSA's USDOT deactivation process is automatic. When your two-month filing window closes and no MCS-150 update is on file, FMCSA's system changes your USDOT number status from "Active" to "Inactive." This happens without warning beyond the original reminder notice. There is no grace period after the window closes.
The consequences of operating with a deactivated USDOT number are significant:
Illegal to Operate
A carrier with a deactivated USDOT number cannot legally operate commercial motor vehicles in interstate commerce. All CMVs must display a current, active USDOT number. Operating without a valid USDOT number violates 49 CFR § 390.21 (marking requirements) and 49 U.S.C. § 13902 (operating authority). Every day of operation is a separate violation.
Civil Penalties Up to $16,550 Per Day
FMCSA civil penalty authority for operating without valid registration reaches $16,550 per violation per day. In enforcement actions, FMCSA typically calculates penalties based on the number of days the carrier operated without proper registration. A carrier operating for even two weeks under a deactivated USDOT number could face a penalty notice exceeding $200,000.
Out-of-Service Orders
Roadside inspectors who discover a deactivated USDOT number have authority to place the vehicle out of service under the federal out-of-service criteria. The vehicle cannot move until the USDOT number is reactivated. This creates immediate operational disruption — cargo on board, delivery commitments, and driver hours are all affected by a roadside OOS order.
Insurance and Broker Vetting Consequences
Freight brokers verify carrier authority and USDOT status before dispatching loads. A deactivated USDOT number causes your carrier profile to show as inactive in broker vetting systems, halting load assignments until reactivation. Insurance underwriters also pull USDOT status, and a record of deactivation may affect renewals and premiums.
Reactivation: How to Get Back Online
If your USDOT number has been deactivated due to a missed MCS-150 biennial update, reactivation is administratively straightforward — but operationally urgent. You must stop operating immediately upon discovering the deactivation, file the overdue MCS-150, and then wait for FMCSA processing before resuming operations.
Step-by-Step Reactivation Process
Stop operating until reactivated
Do not operate CMVs with a deactivated USDOT number. Each day of operation is a separate violation. Communicate with your drivers and dispatch immediately.
Log into the FMCSA Portal and file the overdue MCS-150
Go to portal.fmcsa.dot.gov. File the MCS-150 exactly as you would for a scheduled biennial update — there is no separate "reactivation" form. Filing the overdue MCS-150 is the mechanism for reactivation.
Allow 1-2 business days for processing
FMCSA typically processes MCS-150 updates and reactivates USDOT numbers within one to two business days. Check your Company Snapshot at safer.fmcsa.dot.gov periodically to confirm the status has returned to Active.
Document the reactivation date
Save the MCS-150 filing confirmation and a screenshot of your Company Snapshot showing the reactivation date. This documentation may be important if FMCSA initiates an enforcement action for the deactivation period.
Consider consulting legal counsel if you operated while deactivated
Reactivation eliminates the ongoing violation but does not retroactively cure the period of deactivated operation. If you operated for any period while deactivated, discuss the exposure with a transportation attorney before FMCSA initiates contact.
The 30-Day Change of Information Rule
The biennial update schedule covers routine confirmation of your registration data. But 49 CFR § 390.19(b) creates a separate, rolling obligation: carriers must file a supplemental MCS-150 update within 30 days of any change in the information required by the form. This is the "change of information" requirement, and it operates independently of the biennial schedule.
The 30-day requirement applies when:
Triggers the 30-Day Update Requirement
- Change of principal business address
- Change of company name or DBA
- Addition or removal of company officers
- Change in ownership (ownership transfer)
- Beginning or ending hazmat operations
- Change in operating status (ceasing or resuming operations)
- Significant change in number of CMVs or drivers
Does NOT Reset Your Biennial Schedule
Filing an interim change-of-information MCS-150 update does not reset your biennial schedule. If you file an address change update in September, you still owe your scheduled biennial update in your assigned two-month window in the following year.
Think of the two filing types as separate obligations: the biennial update is calendar-driven, while the change-of-information update is event-driven. Both must be satisfied for your USDOT number to remain compliant.
The change-of-information requirement is important for new carriers in particular. When a small trucking company moves to a new facility, adds a partner, or sells a percentage of the business, the 30-day update is easy to overlook in the chaos of the operational change. But FMCSA auditors will check the address and officer data in your FMCSA profile against your actual operations — if your safety audit occurs at a location that does not match your MCS-150 address, it can complicate the audit and may be cited as a violation.
Common MCS-150 Mistakes That Trigger FMCSA Scrutiny
FMCSA auditors and roadside inspectors compare your MCS-150 data against what they observe — the number of trucks on the road, the cargo being hauled, the names of people signing compliance documents. Discrepancies between your MCS-150 and your actual operations are not just paperwork problems; they indicate to investigators that your compliance posture is weak, which increases scrutiny across every other compliance area. These are the most common MCS-150 mistakes carriers make.
Understating Fleet Size
Carriers who report fewer power units than they actually operate create a discrepancy that FMCSA can detect by comparing MCS-150 data against IRP apportionment records, state commercial vehicle registration data, and roadside inspection history. If FMCSA sees 18 trucks appearing in inspection records but your MCS-150 lists 8 power units, that will be cited. It also distorts your SMS violation rates. Report your actual operating fleet — if fleet size fluctuates seasonally, report the peak number or the number operated at the time of filing.
Filing With an Outdated Address
FMCSA uses your principal business address for correspondence, notice of enforcement actions, and audit scheduling. If your address is wrong, you may not receive notices — including notice of a pending compliance review. Courts and administrative law judges do not accept non-receipt of notice as a defense when the carrier failed to keep the address current. Filing address changes within 30 days as required under 49 CFR § 390.19(b) is the carrier's responsibility.
Listing Former Officers Who Are No Longer With the Company
When a co-founder, partner, or executive leaves the company, many carriers forget to update the MCS-150. This creates problems during audits when FMCSA attempts to contact listed officers who are no longer reachable at the company, and can raise questions about the accuracy of all information on file. Update officer and ownership information within 30 days of any change.
Incorrect Cargo Type Classification
The MCS-150 cargo type fields determine which regulatory requirements apply to your operations. Carriers who haul household goods, hazardous materials, or oversize/overweight freight have additional compliance obligations beyond standard dry van operations. Misclassifying cargo type — whether intentionally to avoid requirements or accidentally due to unfamiliarity with the form — creates exposure when FMCSA finds the actual cargo being hauled does not match the registration.
Filing Late Within the Two-Month Window
Some carriers wait until the last days of their two-month filing window — and then encounter technical issues with the FMCSA Portal, holiday closures, or staff unavailability that prevent completion before the window closes. Filing in the first two weeks of your window eliminates this risk and gives you time to resolve any technical issues without penalty.
Filing Without Verifying the Data
The FMCSA Portal pre-populates the MCS-150 with your last-filed information. Many carriers click through the form confirming pre-populated data that is months or years out of date — including outdated addresses, departed officers, and stale fleet counts. The biennial update is an opportunity to genuinely review your registration data; treat it as such.
MCS-150 vs. UCR vs. Operating Authority: Understanding the Distinctions
Many small carriers confuse the MCS-150 biennial update with other registration-related obligations. These are distinct requirements with different agencies, deadlines, and consequences:
| Requirement | Agency | Frequency | Consequence of Missing |
|---|---|---|---|
| MCS-150 Biennial Update | FMCSA | Every 2 years | USDOT deactivation, penalties |
| UCR (Unified Carrier Registration) | FMCSA / States | Annual | State penalties, operating violation |
| Operating Authority (for-hire) | FMCSA | Tied to insurance filing | Authority revocation |
| BOC-3 (Process Agent) | FMCSA | One-time (update if agent changes) | Authority at risk if process agent lapses |
| IRP Apportionment | State DMV | Annual | Registration violation, fines |
| IFTA License | Base State | Annual | License revocation, back taxes |
The MCS-150 is the only one of these that is managed entirely through the FMCSA Portal and can cause automatic USDOT number deactivation. The others involve separate agencies and separate penalty structures. A comprehensive compliance calendar should track all of them — not just the MCS-150 — but the MCS-150 is the one where missing the deadline results in the most immediate operational consequence.
How FileFlo Tracks Your FMCSA Registration
Most carriers have no system for tracking FMCSA registration deadlines. The biennial update goes into a mental calendar that gets overridden by dispatch, maintenance, driver issues, and everything else that runs a trucking company day to day. The MCS-150 deadline is simple, predictable, and the penalty for missing it is severe — which makes it exactly the type of compliance task that belongs in an automated tracking system rather than a mental to-do list.
How audit-ready are you for compliance?
Free 3-minute FMCSA audit readiness check. No signup, no credit card. See exactly which documents are expired or at risk.
FileFlo organizes your FMCSA registration compliance alongside every other compliance document your operation requires:
Automated MCS-150 Reminders
FileFlo tracks your USDOT number's filing schedule and sends reminders at 60 days, 30 days, and 7 days before your two-month window opens. No more relying on FMCSA's mail reminder reaching the right address.
Filing Confirmation Storage
Upload and store your MCS-150 filing confirmation numbers, submission timestamps, and Company Snapshot screenshots in your FileFlo compliance record — so you always have proof of timely filing accessible in seconds during an audit.
Change-of-Information Tracking
When you log a company change in FileFlo — new address, new officer, fleet size change — the system prompts you to document whether an MCS-150 update was required and filed. Closes the gap between operational changes and regulatory updates.
Full Compliance Dashboard
MCS-150 status sits alongside your driver qualification file completeness, medical card expirations, annual inspection due dates, and drug testing deadlines in a single compliance dashboard — so you see your full regulatory picture at a glance.
The MCS-150 is not a complicated compliance requirement. But it is one that costs carriers dearly when they miss it — not because the form is difficult, but because it is easy to forget. A system that tracks it automatically costs far less than a single day of operating with a deactivated USDOT number.
What FMCSA Auditors Check Against Your MCS-150
During a compliance review or new entrant safety audit, FMCSA investigators use your MCS-150 as a baseline to verify that your actual operations match your registered profile. Understanding what they compare helps you appreciate why keeping the MCS-150 accurate year-round is important — not just at biennial filing time.
Fleet size vs. inspection records
Investigators pull your SMS inspection history and compare the number of unique vehicles inspected against your reported power unit count. Significant discrepancy — more vehicles appearing in inspections than you reported — is a red flag for understated fleet size.
Officers and owners vs. signing authority
Compliance documents — driver qualification files, inspection reports, drug testing certifications — are signed by company officials. If the signing official is not listed on the MCS-150 as an officer or authorized representative, the investigator will question the chain of authority.
Cargo type vs. actual loads hauled
Bills of lading, rate confirmations, and broker records show what cargo was actually transported. If you are hauling household goods but your MCS-150 does not reflect HHG carrier status, investigators will cite both the inaccurate MCS-150 and the additional HHG regulatory violations that flow from operating without the proper registration.
Address vs. physical location
If the audit is conducted at your place of business and the address does not match your MCS-150, the investigator will note the discrepancy. Operations at an address different from the registered address may also raise questions about whether the company operates from additional terminals that should be covered by the registration.
Keep Your USDOT Number Active — Automatically
FileFlo's 5-day free trial includes compliance tracking for your MCS-150 schedule, driver qualification files, vehicle inspections, and all 600+ document types that FMCSA auditors review. No credit card required to start.
MCS-150 Biennial Update — Quick Reference Checklist
Identify your two-month filing window using USDOT last digit
Confirm filing year (even or odd) from last MCS-150 date in SAFER
Log into portal.fmcsa.dot.gov during your two-month window
Review all pre-populated fields — do not just confirm without reading
Update fleet size, driver count, officers, and address if anything changed
Submit and save your confirmation number
Verify USDOT status in SAFER within 48 hours of filing
Store confirmation documentation in your compliance record system
Frequently Asked Questions
Your MCS-150 filing schedule is determined by the last digit of your USDOT number and whether you registered in an even or odd year. Look up your current filing due date by searching your USDOT number in the FMCSA Company Snapshot at safer.fmcsa.dot.gov. The snapshot will show your USDOT number status and your most recent MCS-150 filing date, from which you can calculate when the next biennial update is due. FMCSA also sends reminder notices by mail approximately 30-60 days before the filing window opens, but you are responsible for compliance regardless of whether you receive the reminder.
FMCSA will automatically deactivate your USDOT number if you fail to file the MCS-150 update during your scheduled two-month filing window. Once deactivated, your USDOT number shows as 'inactive' in FMCSA's systems. Operating a commercial motor vehicle with a deactivated USDOT number is a federal violation subject to civil penalties up to $16,550 per day. Roadside inspectors can place your vehicle out of service. Reactivation is straightforward — file the past-due MCS-150 through the FMCSA Portal — but the operational disruption and potential penalties while deactivated can be severe.
Yes. To reactivate a deactivated USDOT number, log into the FMCSA Portal at portal.fmcsa.dot.gov and file the overdue MCS-150 biennial update. There is no separate reactivation fee — filing the past-due MCS-150 is the reactivation mechanism. FMCSA typically processes the update and reactivates the USDOT number within one to two business days of a complete filing. If you operated while deactivated, filing the MCS-150 to reactivate does not eliminate potential civil penalties for operating during the inactive period — FMCSA may still pursue enforcement action for the period of deactivation.
As of October 2025, FMCSA eliminated the MC number as a separate identifier for interstate property carriers. All carriers now use the USDOT number as their sole federal identifier. For MCS-150 purposes, you file a single MCS-150 update using your USDOT number. If you operated under both a USDOT and MC number before the October 2025 change, your filing history under the USDOT number carries forward — you do not need to file separate reports for each number. Carriers subject to operating authority requirements still have operating authority on file, but the MC number is no longer used as the primary identifier.
Yes. The biennial update requirement applies regardless of whether any information has changed since your last filing. Even if your company name, address, fleet size, officers, and cargo type are identical to what was on file, you must still file the MCS-150 update during your scheduled two-month window. The purpose of the update is both to confirm current information and to verify that your company is still actively operating. Filing when nothing has changed is a five-minute process — log in, verify the pre-populated information is still accurate, and submit.
Any change in operating status or material change in company information triggers a requirement to file a supplemental MCS-150 update within 30 days. Triggering changes include: change of principal business address, change of company name, addition or removal of officers or owners, change in the number of commercial motor vehicles operated, change in operating status (e.g., ceasing operations temporarily or permanently), and change in hazardous materials operations. These interim updates do not reset your biennial schedule — you still file the scheduled biennial update during your assigned window even if you filed an interim update three months prior.
Yes. Providing false or misleading information on the MCS-150 is a federal violation under 49 U.S.C. § 521 and 49 CFR 390.19. Civil penalties for falsification of DOT records can reach $16,550 per violation. FMCSA auditors compare MCS-150 data against other sources — inspection records, IFTA filings, insurance records, and IRP apportionment data — and discrepancies trigger scrutiny. Common inaccuracies that create problems include understating fleet size, misrepresenting cargo type to avoid hazmat requirements, and listing officers who are no longer with the company.
Indirectly, yes. Your MCS-150 data informs the FMCSA's carrier profile, which is used in safety analysis including the Safety Measurement System (SMS) that generates CSA scores. Accurate fleet size data in your MCS-150 affects how your violation rates are calculated — violations per inspection are normalized against fleet size, so an understated fleet size can distort your percentile rankings. Insurance underwriters also pull FMCSA carrier profiles, and a deactivated USDOT number will immediately flag in underwriting reviews. Maintaining an accurate, current MCS-150 is foundational to a clean carrier profile.
Related Articles
Continue learning about compliance and operational excellence
FMCSA Maintenance Record Retention: The Complete Part 396 Guide
Exact retention periods for every maintenance record type — DVIRs, annual inspections, repair orders — and what FMCSA auditors request during a compliance review.
What Is a CSA Score and Why It's Costing Your Fleet Money
How the 7 BASICs work, who sees your scores, how they affect insurance premiums, and the concrete steps to improve your carrier safety record.
How to Prepare for a Surprise FMCSA Audit in Under an Hour
The minute-by-minute action plan when an FMCSA investigator calls: what to pull, the 6 compliance factors they score, and how to always be ready.