The fixed schedule
Under 49 CFR §390.19T(b), every active USDOT registrant must update its Motor Carrier Identification Report (MCS-150) every 24 months. The schedule is fixed by USDOT digits, not by your fiscal year or anniversary date.
The MONTH is determined by the LAST digit of your USDOT: 1 = January, 2 = February, ... 9 = September, 0 = October. The YEAR is determined by the SECOND-to-last digit: even number = even year (2024, 2026, 2028...), odd number = odd year (2025, 2027, 2029...).
A USDOT ending in ...23 files in March of every odd year. A USDOT ending in ...40 files in October of every even year. The schedule never moves.
The deactivation trap
A common reason small carriers get deactivated is not understanding that the schedule is fixed. They file MCS-150 once at registration, treat it as a one-time form, and never look at it again. Two years later their USDOT number can be deactivated (49 CFR 390.19T(b)(4)). Note: FMCSA has temporarily suspended enforcement of biennial updates and USDOT inactivation for updates due on or after June 1, 2026, during its move to the Motus registration system. The update is still required.
Don't count on a reminder. The system assumes you know when your deadline is - which is why we built /tools/mcs-150-deadline-calculator. Enter your USDOT, see your next deadline.
What deactivation costs
A carrier with a deactivated USDOT number should not operate until it is reactivated. Brokers and shippers commonly check a carrier's USDOT status on FMCSA's SAFER Company Snapshot before tendering loads.
A carrier that fails to complete its biennial update is subject to penalties under 49 USC 521(b)(2)(B) or 49 USC 14901(a) (49 CFR 390.19T(b)(4)). Under 49 CFR part 386, Appendix B, the inflation-adjusted maximum for recordkeeping violations is $1,584 per day, up to $15,846; reporting violations under 49 USC 14901 carry $1,365 to $10,269 per violation.
Source: 49 CFR 390.19T (eCFR): https://www.ecfr.gov/current/title-49/section-390.19T
How to reactivate
Start by completing the overdue biennial update - Form MCS-150, or Form MCS-150B if you are required to hold a hazardous materials safety permit.
If your operating authority (MC number) was revoked - for example because your insurance filing or BOC-3 designation lapsed - you will also need the missing filings back on record and may need to petition for reinstatement. FMCSA's filing fee for a petition for reinstatement of revoked operating authority is $80 (49 CFR 360.3T).