How to read your due date off your USDOT number
Take your USDOT number and look at the last two digits:
- Last digit = month. 1 means January, 2 February, and so on through 9 for September; a 0 means October. November and December are never assigned.
- Next-to-last digit = year. If it is odd (1, 3, 5, 7, 9), you file in odd-numbered years. If it is even (0, 2, 4, 6, 8), you file in even-numbered years.
- The deadline is the last day of that month in each of your assigned years.
Example: USDOT 3487961 ends in 61. The 1 means January; the 6 is even, so even-numbered years. That carrier's update is due by January 31 of 2026, 2028, and so on.
Why carriers miss it
No reminder arrives, the cycle is two years long, and the deadline does not line up with anything else on your calendar. Around one in eight carriers misses each cycle. The failure is silent: your number gets deactivated, and you usually find out when a broker's system flags you.
Watch out for paid-filing mailers
The MCS-150 update is free at the official FMCSA portal. Mailers that look official and ask for a processing fee are charging you for a free filing. Check anything from your mailbox against the official portal before paying.