USDOT Number
A USDOT number is the unique identifier the federal government assigns to your trucking business so the FMCSA and DOT can track your safety record.
What you actually need to know
You need a USDOT number if you operate a commercial motor vehicle that hauls people or goods in interstate commerce, weighs over 10,001 pounds, hauls 8+ passengers for compensation, or hauls hazmat. Most owner-operators need one.
You get a USDOT number by registering on the FMCSA's Unified Registration System (URS). It's free to register a USDOT number on its own. If you're also registering for MC authority at the same time, you'll pay the $300 MC fee — but the USDOT number itself adds no extra federal cost.
Your USDOT number gets printed on the side of your truck (along with your carrier name) and shows up on every roadside inspection report, log audit, and crash report tied to your business. It's how the federal government — and every broker that vets your carrier — knows who you are.
Common mistakes / confusions
- USDOT number is not the same as MC authority. USDOT identifies you; MC authority gives you legal permission to haul for hire.
- Intrastate-only carriers in some states (TX, FL, GA included) still need a USDOT number even though they don't need MC authority.
- Filing services often charge $200–$500 to register your USDOT number. It's free if you do it yourself.
Related terms
Where to go next
Filing MC Authority soon?
Get the free TruckStart MC Authority Filing Checklist before you spend the $300 FMCSA filing fee.
TruckStart is an educational tool, not a law firm, accounting firm, insurance agency, freight broker, or filing service. Always verify current requirements directly with FMCSA, your state, the IRS, and qualified professionals before making business decisions.