TL;DR: Primary auto liability pays for bodily injury and property damage your truck causes other people. Federal law requires it for for-hire carriers, at limits from $750,000 to $5,000,000 depending on cargo, and your FMCSA filing and MCS-90 endorsement stand behind it. It does not cover your own truck or freight.
What does primary auto liability actually pay for?
It pays other people. When your truck injures someone or damages their property and your company is legally responsible, primary auto liability pays the medical bills, repair costs, settlements, and judgments, and it pays for the lawyers who defend you. For federally regulated carriers the coverage also includes environmental restoration, meaning cleanup of pollution caused by a covered accident, because that is part of the public liability definition in 49 CFR part 387.
What does it not cover?
Three big things people wrongly assume are included. Your own truck: that is physical damage coverage, a separate purchase. The freight in your trailer: that is motor truck cargo coverage. Your own injuries: those fall to workers comp or occupational accident coverage. Primary liability is a wall between your business and the people you might hurt; it is not protection for your own stuff.
How much primary liability does a trucker need?
Start with the federal floor, then let the market set the real number. Under 49 CFR 387.9, unchanged since January 1, 1985, for-hire carriers of non-hazardous freight in vehicles rated 10,001 pounds or more must carry at least $750,000. Oil and most listed hazardous materials require $1,000,000, and bulk high-hazard commodities require $5,000,000. In practice, standard broker and shipper agreements demand $1,000,000, so that is what most general freight carriers buy.
| Operation | Federal minimum | Market standard |
|---|---|---|
| General freight, for-hire, 10,001 lbs and up | $750,000 | $1,000,000 |
| Oil and listed hazmat | $1,000,000 | $1,000,000 or more |
| Bulk high-hazard commodities | $5,000,000 | $5,000,000 |
How does the coverage connect to my FMCSA filings?
Your insurer proves the coverage exists in two ways. It files a certificate, Form BMC-91 or BMC-91X, electronically with FMCSA, which keeps your operating authority valid under 49 CFR 387.301. And it attaches the MCS-90 endorsement to the policy, which promises the public that final judgments get paid up to the required limit even when the policy would otherwise exclude the claim, with the insurer keeping a right of reimbursement against you. If the policy cancels, the insurer must give FMCSA 30 days notice, and a filing that dies without replacement puts your authority into revocation.
What drives the price of primary liability?
Underwriters price the chance your trucks hurt someone. The big inputs are your years in business and safety record, your drivers, their age, experience, and motor vehicle records, your radius and lanes, your commodity, your equipment and maintenance, and your loss runs. New authorities pay the most because there is no history to price. You cannot change your past, but every renewal rewards the things you control: hiring standards, telematics, maintenance, and clean inspections.
Does liability follow the truck or the driver?
The policy covers scheduled vehicles and the people permitted to drive them, and for leased-on operations the answer shifts: under 49 CFR 376.12, the motor carrier holding the authority bears complete responsibility while the truck works under its lease, so the carrier's primary liability responds to dispatched operations. That is why leased-on owner-operators buy non-trucking liability for personal use instead of their own primary policy, and why running any load under your own authority requires your own coverage and filing first.
What should I check on my own policy?
Four things. The limit matches your commodity tier and your shipper contracts. Every truck and trailer you operate is scheduled, because the MCS-90 pays the public for unscheduled equipment and then bills you. The named insured matches your authority exactly. And the filing shows active on FMCSA's public Licensing and Insurance record. Five minutes of checking beats discovering a mismatch after a crash.
Real questions owner-operators and fleet managers ask
Is primary auto liability the same as the FMCSA filing?
No. The coverage is the policy itself. The filing, a BMC-91 or BMC-91X, is the certificate your insurer sends FMCSA proving the coverage exists. The MCS-90 endorsement is a third piece, attached to the policy as proof of financial responsibility. All three must line up.
Does primary liability cover damage to my own truck?
No. Damage to your own tractor or trailer is physical damage coverage, purchased separately. Primary liability only pays people you injure and property you damage, plus your legal defense. Lenders usually require physical damage before financing a truck.
Why do brokers require $1,000,000 when the law says $750,000?
Standard broker-carrier agreements and shipper contracts set $1,000,000 because the federal floor, unchanged since January 1, 1985, is widely seen as too low for serious injury crashes. Without a $1,000,000 certificate you will be locked out of most brokered freight.
Does my primary liability cover me when I bobtail home?
If you run your own authority, your policy generally follows your operations. If you are leased on, the carrier's policy covers dispatched work, and personal or non-dispatched use falls to non-trucking liability, the coverage built exactly for that gap.
What is environmental restoration coverage?
It is part of public liability for regulated carriers: payment for cleaning up pollution caused by a covered accident, such as diesel spilled in a crash. It travels with the liability coverage under 49 CFR part 387 rather than being a separate policy.
Why truckers work with Morrow
- We know the filings. Morrow places primary liability at the right federal tier for your commodity and confirms the FMCSA filing posts.
- New authority is our normal. First-year carriers pay the most and get declined the most. We work with markets that actually want new ventures and we tell you what the first renewal takes.
- Certificates and filings, fast. Certificates of insurance the same business day for most carriers, and federal or state filings submitted electronically so your authority is not sitting in a queue.
- We quote the whole picture. Liability, cargo, physical damage, and the endorsements shippers and brokers actually check for, priced together so nothing is missing when a load is on the line.
- Real people when something goes wrong. A claim, a lapse notice, or a lost certificate gets a person, not a portal.
Related trucking guides
Short answers to the surrounding questions truckers ask next.
- Trucking insurance at Morrow (start here)
- Federal minimum liability limits by commodity
- What is an MCS-90 endorsement?
- Physical damage coverage for trucks
- Excess and umbrella liability for truckers
- Non-trucking liability (bobtail) coverage
- Commercial auto for trucking fleets
This guide is general information, not legal, tax, or insurance advice. Limits, forms, and deadlines change, so verify current requirements with FMCSA before you rely on them. Morrow is a brand name of Afthonea Inc. Last updated: July 2026.