An MCS-150 update (aka Biennial Update) is required by the FMCSA every two years at a minimum to obtain and maintain your USDOT number. In addition to submitting biennial updates, you’ll need to file an MCS-150 update if you have: Changed your business address Changed your company name Changed your operating authority Become a hazardous materials carrier Added to or reduced the number of vehicles in your fleet Make any other changes to your business Any time you make changes to your trucking business and operations, you should file an MCS-150 update. For MCS-150 Biennial Update Click Here