The MCS-150 (Motor Carrier Identification Report) is what tells the FMCSA your USDOT number is still active and your information is current. Miss the biennial update and your DOT number is deactivated — meaning you're operating illegally.
When MCS-150 is due
The FMCSA assigns a biennial filing schedule based on the last digit of your USDOT number and whether it's even/odd. Most carriers file every two years; some carriers with operational changes file more often.
You also have to file an MCS-150 every time your fleet size, mileage, address, contact info, operating authority or hazmat status changes materially.
What we handle
Filing your biennial update on time, every cycle, with your verified mileage and fleet size.
Updating your MCS-150 after a move, name change or change of ownership.
Filing the MCS-150B/C when you're applying for, changing or reinstating operating authority.
Confirming your USDOT number remains active in the FMCSA SAFER system.
Frequently asked questions
What happens if I miss my MCS-150 update?
The FMCSA deactivates your USDOT number. Driving on a deactivated number is a violation and can result in out-of-service orders.
Is filing an MCS-150 the same as renewing my DOT number?
Effectively, yes. There's no annual 'renewal fee' — keeping your MCS-150 current is what keeps your DOT number active.
Do I have to file if nothing changed?
Yes. You file a biennial update even if every field is identical to last cycle.