Do I need MCS-150 if I only operate intrastate?
Most intrastate carriers with a USDOT still need to file MCS-150 every 24 months. The 49 CFR §390.19T biennial-update requirement applies to any carrier registered with FMCSA - intrastate-only carriers who hold a USDOT (typically because they operate CMVs above the federal threshold and the state-level USDOT registration was federalized) are in scope.
FMCSA's "Do I Need a USDOT Number?" page (updated September 3, 2025) lists 38 states plus Puerto Rico that require their intrastate commercial motor vehicle registrants to obtain a USDOT number. A CMV operating only inside one of those states still gets a USDOT and is then on the FMCSA biennial-update schedule. The carrier files MCS-150 the same as an interstate carrier. The full list is in our guide to USDOT numbers for intrastate carriers.
The 12 states not on FMCSA's list handle intrastate registration through their own state systems. Carriers operating purely intrastate in those states may not hold a federal USDOT and therefore not be on the MCS-150 schedule - but they typically have a state-level registration with its own update cadence.
For carriers operating both interstate and intrastate (a common pattern for regional fleets), the federal MCS-150 covers the interstate operation; the intrastate registration cycle is a separate state-level filing on top.
A common confusion: a carrier with a USDOT but no MC (private fleet hauling its own goods, intrastate-only) still needs MCS-150 because they hold an active USDOT. The MC vs USDOT distinction does not change the §390.19T requirement.