MCS-150 / Biennial updates are required for individuals and companies that require a US DOT Number. Updates need to be filed biennially or with greater frequency if the following changes are made to the business:
- Modification to the company name
- Change of the business address
- Switching operating authority type
- Qualifying as a hazardous materials carrier
- Adding/reducing the number of vehicles in the company fleet
- Changing any other aspect of the business