Quick answer
A late or missed MCS-150 biennial update can lead to civil penalties and deactivation of the USDOT number under 49 CFR 390.19T(b)(4). A USDOT number deactivated for a missed update is reactivated by filing the MCS-150 update. The due month follows the last digit of your USDOT number; the next-to-last digit sets odd or even years.
Note: FMCSA has temporarily suspended enforcement of biennial updates and USDOT inactivation for updates due on or after June 1, 2026. The update is still required.
Reviewed by Korey Sharp-Paar · Updated
The MCS-150 biennial update is due every 24 months under 49 CFR §390.19T. If it is missed, FMCSA can assess civil penalties (inflation-adjusted each year per 49 CFR §386 Appendix B) and deactivate the USDOT number. The fix is the same at every stage: file the missing MCS-150 update.
When is my MCS-150 due under 49 CFR §390.19T?
49 CFR §390.19T obligates every USDOT holder to update its record every 24 months - not every calendar year. The filing year is set by the next-to-last digit of your USDOT: odd digit means an odd-year filing year, even means even-year. The last digit sets the month (1 = January, 2 = February, ... 0 = October). FMCSA publishes the lookup table in Appendix A of the MCS-150 instructions.
The biennial-update rule has no calendar flexibility. §390.19T(b)(2) states the update “must be filed” in the assigned month. FMCSA treats any filing after the last day of that month as late.
What happens after you miss the MCS-150 deadline?
A missed update moves through these stages. FMCSA controls the timing of each one.
| Stage | What it means |
|---|---|
| Due month ends | The biennial update is late. FMCSA treats any filing after the last day of the assigned month as late. |
| Update still missing | Civil penalties can apply, and the USDOT number can be deactivated (49 CFR 390.19T(b)(4)). |
| Update filed | A USDOT number deactivated for a missed update is reactivated by filing the MCS-150 update. |
Source: "What happens after a missed MCS-150," fasttruckingcompliance.com (https://www.fasttruckingcompliance.com/guides/mcs-150-late-filing-consequences#deactivation-timeline). Updated October 24, 2026.
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<p style="font-size:12px"><a href="https://www.fasttruckingcompliance.com/guides/mcs-150-late-filing-consequences#deactivation-timeline">What happens after a missed MCS-150 — fasttruckingcompliance.com</a></p>Operating on a deactivated USDOT number turns a paperwork problem into a liability problem, so the practical answer at every stage is to file the missing update.
What penalties apply to a late MCS-150?
A missed biennial update is a violation of 49 CFR §390.19T, which brings civil-penalty authority under 49 USC §521(b)(2)(A). The penalty schedule is inflation-adjusted every year under 49 CFR §386 Appendix B and the Federal Civil Penalties Inflation Adjustment Act (Pub. L. 101-410). Separately, the USDOT number can be deactivated until the update is filed (49 CFR 390.19T(b)(4)).
File the update first
A USDOT number deactivated for a missed update is reactivated by filing the MCS-150 update, so filing it is the first step in every case.
How do I reactivate a deactivated USDOT number?
File the missing MCS-150 update directly with FMCSA. A USDOT number deactivated for a missed update is reactivated by filing the MCS-150 update; no separate petition is needed for that. The MCS-150 glossary entry covers the underlying biennial-update rule in more detail.
If your MC operating authority was revoked for a different reason (for example, an insurance lapse or an unpaid civil penalty), that is a separate reinstatement. At fastreinstatementfiling.com, your reinstatement request is prepared and submitted for you once the cause is cleared; FMCSA controls how long approval takes.
How do I avoid missing the next MCS-150 cycle?
MCS-150 doesn’t have an automatic email reminder from FMCSA. The due date is derived from your USDOT digits and never changes, which means a single calendar reminder set once will work for the life of the carrier. Our deadline calendar tool calculates the exact due month from your USDOT and exports an iCal file you can import into Google Calendar, Apple Calendar, or Outlook.
For carriers who have already been late once: Vault Pro ($9/mo or $69/yr) monitors your FMCSA record and sends 60/30/7-day reminders before every MCS-150 due date. It also tracks insurance filings, UCR status, and authority status so those deadlines all sit in one alert feed.
Related guides
Authority Reinstatement Process
When operating authority is revoked or inactive - causes, cure filings and costs.
Read the Authority Reinstatement Process guideDOT Compliance Handbook
The complete federal compliance roadmap from USDOT through CSA - the pillar reference.
Read the DOT Compliance Handbook guideUSDOT vs MC Authority
When each identifier applies and how the two work together for interstate carriers.
Read the USDOT vs MC Authority guideUSDOT deactivated? File the missing update.
If your authority was revoked for another reason, your reinstatement request is prepared and submitted for you once the cause is cleared.