Most operators don't read their commercial auto policy until something goes wrong. That's when the coverage types, exclusions, and endorsements that seemed like fine print suddenly matter a lot.
Commercial auto isn't a single thing. It's a set of coverages, each with its own scope, its own exclusions, and its own compliance requirements depending on how you operate.
This article breaks down what's typically inside a commercial auto policy, what commonly sits outside it, and where federal minimums diverge from what carriers and freight brokers actually expect. If you're building your coverage stack or reviewing it ahead of renewal, this is the right place to start. Not sure if you need commercial? See commercial vs personal.
The Core Coverages in a Commercial Auto Policy
A standard commercial auto policy for transport operators generally includes four main components. They protect different things and pay different parties.
| Coverage Type | What It Pays For | Who It Protects |
|---|---|---|
| Commercial Auto Liability | Third-party bodily injury, property damage, legal defense costs | Other parties injured or damaged by your driver |
| Physical Damage: Collision | Repairs to your vehicle after an at-fault accident or rollover | You (your vehicle) |
| Physical Damage: Comprehensive | Theft, fire, weather damage, vandalism | You (your vehicle) |
| Medical Payments / PIP | Driver's medical bills after an accident, regardless of fault | Your driver |
| Uninsured/Underinsured Motorist | Your costs when the at-fault driver has no coverage | You and your driver |
Physical damage coverage isn't always included by default. It depends on whether you own the vehicle outright, are financing it, or are operating on a lease.
Lenders generally require it. If you own your equipment free and clear, some operators drop physical damage to reduce premium, which is a decision worth discussing with your broker before you make it. For rate benchmarks, see our insurance cost guide.
What Commercial Auto Liability Actually Covers
Commercial auto liability is the mandatory core. It covers bodily injury and property damage to third parties when your driver causes an accident: medical bills, lost wages, property repairs, legal defense costs, and settlements, up to your policy limit.
What it doesn't cover: your own vehicle, your cargo, or your driver's injuries. Those require separate coverage, and confusing them is one of the more common gaps operators run into.
For interstate for-hire carriers, two additional elements attach to the liability policy by federal requirement:
- MCS-90 endorsement: A mandatory addition that guarantees the insurer will pay a final public liability judgment, even if the specific incident involves a policy exclusion or a breach of conditions by the insured. It exists to protect the public. Without it, your policy doesn't meet FMCSA requirements.
- BMC-91 or BMC-91X filing: The certificate your insurer files electronically with the FMCSA to confirm your coverage is in place. Without a valid BMC-91 on file, your MC number stays inactive and you can't legally operate.
Both are handled by your insurer, but confirming they've been filed correctly is your responsibility. For the full filing sequence, see our authority guide.
FMCSA Minimum Limits vs. What the Market Requires
The FMCSA sets minimum public liability requirements under 49 CFR Part 387 for interstate for-hire carriers. Here's how those minimums break down by operation type:
| Operation Type | FMCSA Minimum Liability |
|---|---|
| General freight, GVWR 10,001 lbs+ | $750,000 |
| Household goods carriers | $750,000 |
| Vehicles under 10,001 lbs, non-hazardous cargo | $300,000 |
| Oil and non-hazardous substances | $1,000,000 |
| Hazardous materials (certain classes) | $5,000,000 |
Here's the catch: being legally compliant and being operationally compliant aren't the same thing. Many freight brokers and shippers won't tender a load to a carrier showing $750,000 auto liability.
The market standard for most general freight is $1,000,000. A carrier who's legal at the FMCSA floor can find themselves locked out of loads until their limits are increased.
State regulations add another layer. Some states set their own minimums for intrastate operations that differ from the federal baseline. If you operate across multiple states or you're unsure where your state DOT requirements sit, consult your broker about the right limits for your operation.
What's Not Covered Under Commercial Auto
This is where most articles stop being useful. Understanding the exclusions matters as much as knowing what's covered.
Cargo. Commercial auto does not cover the freight you're hauling. If your load is damaged or stolen in transit, that's a motor truck cargo claim, not a commercial auto claim. Shippers and brokers routinely require minimum cargo coverage, commonly $100,000 per occurrence, before they'll work with a carrier. See our cargo insurance guide.
Non-dispatched time. If you're leased to a motor carrier, your commercial auto liability typically applies only when you're operating under dispatch. Driving personal errands, heading home after a delivery, running the truck without an active load: those scenarios may fall outside the primary policy. That's where non-trucking liability for owner-operators comes in.
Bobtail exposure. Operating the tractor without a trailer, outside of dispatch, creates a similar gap. Bobtail coverage is the specific policy designed for that window: between loads, between dispatches, when the motor carrier's policy doesn't apply and your commercial auto may not either.
Your drivers' on-the-job injuries. Commercial auto liability covers other people. If your driver is injured on the job, that's a workers compensation claim, not a commercial auto claim. Workers comp is handled separately.
Loading and unloading incidents. A slip-and-fall at a loading dock, damage to a third party's property during loading: these often fall outside commercial auto and into truckers general liability territory. They're related but distinct.
Unlisted or excluded drivers. Most policies require all regular drivers to be listed. An accident involving an unlicensed driver or someone specifically excluded from your policy will almost certainly result in a denied claim.
Intentional acts. Straightforward. Deliberate damage isn't covered.