MCS-150 biennial update schedule and current FMCSA notice
A motor carrier's USDOT registration details do not stay current merely because its vehicle and driver files are in order. FMCSA normally requires an MCS-150 series biennial update on a schedule based on the last two digits of the USDOT number. The update may be due even if the company details have not changed. In 2026, however, FMCSA has temporarily suspended enforcement of the biennial-update requirement and inactivation of USDOT numbers for registrants whose update was due on or after 1 June 2026 while its registration-system transition stabilises. That notice is time-sensitive: check its current status before acting or publishing advice.
This guide explains the normal schedule, current exception and evidence trail for an FMCSA-regulated entity with a USDOT number. It does not decide whether a particular business needs a USDOT number, operating authority, a hazardous-materials permit or a state registration. Use FMCSA's current registration record and guidance for those separate decisions.
Calculate the normal month and year
Under the regular FMCSA updating-registration guidance and 49 CFR § 390.19T, the last digit of the USDOT number gives the filing month: 1 is January, 2 February and so on through 9 September, while 0 is October. The next-to-last digit determines the year parity: an odd digit points to odd-numbered years; an even digit to even-numbered years. The normal filing deadline is the last day of that month. For a hypothetical number ending in 42, the normal month is February and the year is even. This is a calculation example, not a claim about any real carrier's filing status.
| USDOT ending | Normal filing month | Year selector |
|---|---|---|
| Last digit 1–9 | January–September respectively | Next-to-last digit: odd year if odd, even year if even |
| Last digit 0 | October | Same odd/even rule |
FMCSA's no-change FAQ states that all entities with a USDOT number ordinarily file on the prescribed biennial schedule, even with unchanged information. It also explains when a qualifying update in the preceding 12 months can satisfy the biennial obligation. Do not assume that merely viewing the Company Snapshot counts as filing.
Apply the 2026 temporary suspension separately
FMCSA's temporary-suspension notice, last updated 10 September 2026 when checked for this draft, says registrants whose biennial update was due on or after 1 June 2026 will have additional time and will not have their USDOT number inactivated for failing to submit the required update during the suspension. The notice does not publish a replacement individual deadline in the material checked for this draft. Do not invent one.
The normal two-digit schedule remains useful for identifying which filing would have been due and for preparing accurate data. But a carrier should not be told that an otherwise current October 2026 deadline will automatically trigger inactivation while the notice remains in force. Nor should it assume that the suspension excuses inaccurate company information forever or affects separate registration and operating-authority obligations. Capture the live FMCSA notice and ask FMCSA directly when a case-specific registration status is unclear.
Because this relief is tied to a changing registration-system transition, the publication workflow must revisit the FMCSA page on the day this article goes live. If the agency restores enforcement or sets a new deadline, revise the notice section and metadata before publication; otherwise mark the content HOLD until the current position is confirmed.
Check the record before submitting
Use FMCSA's updating-registration page to review the appropriate MCS-150 series route and current submission method. Compare the legal business name, address, operation type, vehicles, drivers and other relevant fields with current business records. The FMCSA registration-forms page distinguishes the MCS-150 series forms and online or ticket routes. Do not copy an old PDF or send sensitive identity material through an unverified third-party site.
The normal biennial filing is separate from a routine change update. FMCSA advises entities to update their registration when legal name, address or other details change. A motor carrier should not wait until the biennial month to fix information that is already materially wrong. Conversely, a recent update may satisfy the normal biennial filing if it meets the agency's conditions; confirm that against the current FMCSA FAQ and the carrier's record.
For an audit trail, retain the USDOT number checked, normal calculated schedule, date and source of the temporary-relief check, actual submission route, confirmation or ticket number, and the final updated Company Snapshot or agency response. Distinguish submitted, received and reflected in the public record; a delayed public display is not proof of no filing, while an unconfirmed form upload is not proof of completion. Route discrepancies to FMCSA's official support channel.
Keep the compliance calendar honest
An internal calendar can show the normal biennial month and a separate alert to recheck the temporary FMCSA notice. Label a suspended deadline as agency relief under review, not “completed”. Assign an owner to monitor the notice and the carrier record. When the agency announces a new date or process, update the register and communicate the change to the person responsible for filing.
The Complys US DOT compliance software page is the relevant commercial route for discussing record and reminder workflows. Ask for a product demonstration before describing how a filing alert would actually be configured. This article does not claim Complys files MCS-150 forms, reads FMCSA status automatically, guarantees a submission deadline or prevents DOT-number inactivation.
Primary sources and publication gate
- FMCSA temporary suspension notice: 2026 enforcement/inactivation position; same-day publication check required.
- FMCSA updating-registration guidance and registration forms: normal schedule and submission routes.
- eCFR — 49 CFR § 390.19T: underlying federal filing framework.
- FMCSA no-change FAQ: ordinary filing rule and qualifying recent update.
Before publication: Recheck every time-sensitive FMCSA notice and portal instruction, verify current live/in-flight owner, confirm the DOT money page's product statements and the final canonical URL. If the suspension status cannot be established, HOLD publication rather than publishing a stale deadline.
For the related Complys product, see DOT Compliance Software. This guide is general information, not legal advice; verify current requirements against the official sources linked above.