Home › MCS-150 Biennial Update
Every 24 months (biennial), on a month + year fixed by your USDOT number. Filed with the FMCSA. Here is who it applies to, when it falls, and what a late filing actually costs.
Every interstate motor carrier with an active USDOT number (and many intrastate carriers in states that require it).
Your due date is not assigned at random and it is not our opinion — it is a pure function of your own USDOT number:
Month, digit by digit:
Failure to update deactivates your USDOT number; civil penalties up to $10,000 (49 U.S.C. 521).
The biennial update is the one carriers talk themselves out of, and it is the one with the least room for interpretation. FMCSA requires the update every two years even if nothing about your company has changed, even if you have ceased interstate operations since the last update, and even if you are no longer in business and never told FMCSA. “Nothing changed” is not a filing status.
Updating your information is free. Nobody has to be paid to press the button for you — which is worth knowing, because the mailers that arrive around your due month rarely mention it.
FMCSA strongly encourages the online route: upload your completed MCS-150 through the Ask FMCSA website at ask.fmcsa.dot.gov, and you receive a confirmation number by email. Keep that number — it is the only thing that proves you filed on a day you can name.
Paper still works, and it still bites. Mailed forms must be received by FMCSA on or before your due date, not postmarked by it, so a form dropped in the box on the last day of your month is already late. The Office of Registration sits at 1200 New Jersey Avenue S.E., Room W65-206, Washington, DC 20590.
Deactivation of the USDOT number is the part that stops trucks: it is not a fine you settle later, it is your operating identity going inactive. On top of it, FMCSA cites civil penalties of up to $1,000 per day, capped at $10,000.
Filing outside your assigned month is also not neutral — an update filed early resets nothing about the schedule, which stays a function of your USDOT number, not of when you last touched the form.
We are a reminder tool, not the agency. The rule itself is published by the FMCSA, and that page is the one that wins if anything here ever falls out of date:
Enter your USDOT number once and see your next MCS-150 deadline free — then keep the rest of the calendar in one place.
Check my date →DOTDeadline is an independent reminder tool. It is NOT affiliated with, endorsed by, or connected to the FMCSA, the U.S. DOT, the IRS, or any government agency. General information only — not legal, tax, or compliance advice. Always confirm with the official agency.