Every week a new-authority trucker calls us proud of a bargain: a general liability quote for a few hundred dollars, ready to activate their MC. And every week we have to be the ones to say it: that policy won't start your authority. It can't. General liability and auto liability are different coverages that answer different risks, and only one of them is what FMCSA is waiting on. The price gap is exactly why the mix-up happens, and exactly why it's a trap.
Auto liability: the on-road coverage FMCSA requires
Auto liability (AL) covers the bodily injury and property damage you cause to others while operating the truck, the wreck on the interstate, the car you rear-end, the guardrail you take out. This is the coverage the federal government cares about. To go active, FMCSA requires your insurer to file proof of it, a BMC-91X, and your policy carries the MCS-90 endorsement that guarantees the public gets paid. The federal minimum is $750,000, though most brokers, shippers, and real-world contracts expect $1,000,000.
That filing is the whole point. Your authority flips to active when FMCSA receives the BMC-91X from your insurer. No filing, no active authority. And here's the part that matters for today's topic: you cannot file a general liability policy. There's no BMC-91X for GL. It's the wrong instrument for the job.
General liability: your business off the truck
General liability (GL) covers non-auto business liability, the things that go wrong when you're not driving. A visitor slips in your yard. You damage a dock or a customer's property while loading. Something you did on a job creates a claim after the fact. GL responds to premises and operations liability, the ordinary risks of running a business.
What GL does not touch is an accident caused by operating the truck on the road. That's auto liability's job, full stop. GL is cheaper precisely because it isn't carrying the enormous risk of a loaded rig at highway speed. A low GL premium isn't a deal on trucking coverage, it's a quote for a completely different, much smaller exposure.
Get the auto liability and filing that activate your authority
Why the confusion is so common
Two reasons. First, the word "liability" is in both names, and a new operator reasonably assumes "liability insurance" is "liability insurance." Second, the price. A GL quote can be a fraction of an auto liability premium, and when you're standing up a new authority and watching every dollar, the cheap number looks like the answer. It isn't. It's cheap because it doesn't cover the thing that actually gets you running, or the thing most likely to bankrupt you.
Buying GL to activate your authority is like buying renters insurance to register a car. Real coverage, wrong purpose.
| Auto liability (AL) | General liability (GL) | |
|---|---|---|
| Covers | Injury/damage you cause operating the truck | Premises & operations, non-auto business claims |
| Filed with FMCSA? | Yes, BMC-91X / MCS-90 | No, cannot be filed |
| Activates your authority? | Yes | No |
| Typical limit | $1,000,000 ($750k federal min) | $1,000,000 (per contract needs) |
| Relative cost | The major line on your policy | Comparatively cheap |
So do you need GL at all?
Often, yes, just not for the reason people think. GL doesn't activate your authority, but plenty of shippers, brokers, warehouses, and facilities require it before they'll let you haul for them or onto their property. Some new-venture packages bundle a modest GL limit for exactly that. It's a legitimate, useful coverage. It's simply complementary to auto liability, not a substitute for it. You activate on AL; you add GL where a contract or facility demands it.
The clean mental model: auto liability gets you legal to run. General liability gets you into certain lots and contracts. You may need both. You are never getting active on GL alone.
Get the order right
For a brand-new authority, the sequence is: auto liability with the BMC-91X filing (plus cargo, and any other FMCSA-required filings for your operation), then layer in GL, non-trucking, or physical damage as your contracts and equipment require. We walk through the full activation checklist in new authority? here's the insurance FMCSA is waiting on and the filings themselves in FMCSA insurance requirements, explained. If you want the plain-English version of what auto liability actually does, start with primary liability, explained like a human.
How McClure helps
If you're activating a new authority, we'll quote the auto liability you actually need, handle the BMC-91X filing with FMCSA so your authority goes active, and add general liability only where a contract calls for it, no paying for the wrong policy, no waiting on a filing that never comes. Send us your details and we'll map the whole package, filings included.