Commercial auto liability insurance for trucking companies
Commercial auto liability pays for injuries and property damage your trucks cause to other people, plus your legal defense, up to the policy limit. It is the coverage federal law requires: at least $750,000 for most interstate for-hire freight, with the MCS-90 endorsement attached. It never pays for your own truck or load.
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What is commercial auto liability insurance?
Commercial auto liability insurance pays for the harm your business vehicles do to other people. In the standard ISO Business Auto Coverage Form, the insurer agrees to pay “all sums an ‘insured’ legally must pay as damages because of ‘bodily injury’ or ‘property damage’” caused by an accident and resulting from the ownership, maintenance, or use of a covered auto. For a trucking company, that means the other driver’s medical bills, the car you hit, and the guardrail or storefront you damaged.
- Your defense: the insurer has the right and duty to defend you against a suit seeking those damages, and that duty ends once the liability limit is used up by judgments or settlements.
- Costs on top of the limit: in the 2013 edition of the form, the insurer’s own expenses, court costs, post-judgment interest, up to $2,000 for bail bonds after a covered accident, and up to $250 a day in lost earnings when it asks you to help do not reduce the limit.
- Who is covered: you, for any covered auto, and anyone else driving a covered auto you own, hire, or borrow with your permission, with exceptions. One matters to fleets that lease trucks: the owner you hire or borrow a truck from is not an insured under this form.
- Which trucks are covered: only the autos the covered-auto symbols on your declarations point to. Our guide to commercial auto symbols explains how to read them.
Business auto or motor carrier policy?
Truckers usually buy auto liability in one of two policy types. The Texas Department of Insurance describes the business auto policy as covering most types of commercial vehicles and the motor carrier policy as covering truckers, with room for cargo coverage. IRMI notes that ISO introduced the motor carrier policy in 1993 for for-hire carriers, private carriers, or both. Either way, the liability part works the same way: it pays others, not you.
What does commercial auto liability cover and exclude?
Auto liability answers for injury and damage to third parties. The exclusions send most other trucking losses to a different policy, and knowing where each one goes is how you spot a gap before a claim does.
| Claim | Auto liability? | Where it belongs |
|---|---|---|
| Injury to another driver or passenger in a crash you cause | Yes | Auto liability |
| Damage to another vehicle, a building, or roadside property | Yes | Auto liability |
| Damage to your own tractor or trailer | No | Physical damage |
| Damage to the load you are hauling | No: property you transport or have in your care is excluded | Motor truck cargo |
| Injury to your own employee on the job | No | Workers’ compensation or occupational accident |
| Spill cleanup of hazardous cargo | No: pollutants you are hauling are excluded | A pollution endorsement; the MCS-90 can force payment for environmental restoration, with reimbursement |
| Fuel leaking from the truck’s own tank after a crash | Yes, as an exception to the pollution exclusion | Auto liability |
| Indemnity you promised a shipper or broker | Only for an “insured contract” | Auto liability, if the contract qualifies |
The contract row is the one carriers miss. The form covers liability you take on in an “insured contract”, which includes the part of a business contract where you assume another party’s tort liability for bodily injury or property damage to a third party. Other promises in a shipper or broker agreement fall outside it, so send new contracts to your agent before you sign.
Loading and unloading: auto or general liability?
The two standard forms are built to meet at the dock. The ISO commercial general liability form excludes injury or damage arising out of the use of an auto, and “use includes operation and ‘loading or unloading’”, so a load that is being moved onto, carried in, or taken off the truck is an auto exposure. The auto form, in turn, excludes handling property before it leaves the place you accepted it or after it reaches the place you deliver it, and moving property with a mechanical device other than a hand truck unless the device is attached to the truck.
- Your liftgate drops a pallet on a receiver’s worker: an attached device during unloading, so auto liability.
- A forklift that isn’t attached to the truck injures someone: excluded from auto, and not loading or unloading under the CGL definition, so general liability.
Our guide to CGL insurance for truckers walks through more claims at that boundary.
How much auto liability does a trucking company need?
At least the federal or state minimum, and usually more. For interstate carriers, the minimums are set in 49 CFR 387.9 and, for operating authority, 49 CFR 387.303T (in force while the original 387.303 is suspended). Federal rules call this required coverage public liability: liability for bodily injury and property damage, including environmental restoration.
| Operation | Applies to | Minimum |
|---|---|---|
| General freight, vehicles of 10,001 lb GVWR or more | For-hire, interstate | $750,000 |
| General freight, fleet of vehicles all under 10,001 lb GVWR | For-hire, interstate | $300,000 |
| Oil, and hazardous materials not in the $5 million group | For-hire and private, interstate (intrastate in bulk only) | $1,000,000 |
| Listed bulk hazardous substances, explosives, poison gas, and highway route controlled radioactive materials | For-hire and private, interstate and intrastate | $5,000,000 |
A carrier that runs only inside one state follows that state’s rules instead. Texas, for example, requires $500,000 for intrastate trucks over 26,000 pounds; see commercial truck insurance in Texas.
Choosing a limit above the minimum
- What the market carries: in its latest commercial auto report, the Texas Department of Insurance found the median liability limit has stayed at $1 million, and about 83% of premium for trucks, tractors, and trailers comes from policies at that limit.
- One limit per accident: the standard form pays no more than the limit for any one accident, regardless of how many trucks, insureds, or claimants are involved.
- Layers: federal rules let you meet the limit with a primary policy plus excess coverage above it. Each insurer in the stack files its own certificate with FMCSA.
- Contracts: brokers, shippers, and lenders can require more than the law does. Check their insurance clauses before you set the limit.
The out-of-state extension in the business auto form raises your limit to meet another state’s compulsory auto law, but it does not apply to limits set by motor carrier laws, so the policy itself must carry your federal or state trucking minimum.
How do the MCS-90 and federal filings work?
A motor carrier may not operate until the required coverage is in effect, under 49 CFR 387.7. Two documents prove it: the filing your insurer sends to FMCSA, and the MCS-90 endorsement on your policy.
- BMC-91 or BMC-91X: the certificate of insurance your insurer files with FMCSA. Per FMCSA, the agency will not grant operating authority until it is on file, and an applicant that doesn’t comply within 20 days of publication in the FMCSA Register gets 60 days before the application is dismissed. Keeping the filing current is your responsibility.
- MCS-90: an endorsement attached to your liability policy, not issued per vehicle. FMCSA says it applies to all vehicles under the policy that are subject to the federal requirements. Keep a copy at your principal place of business.
- Cancellation: the policy and endorsement stay in effect until cancelled with 35 days’ written notice, and a filing cannot be withdrawn until 30 days after FMCSA receives the cancellation notice.
What the MCS-90 does, and what it doesn’t
In the MCS-90 language quoted in McComb v. National Casualty (N.D. Ill. 2013), the insurer agrees to pay any final judgment against the insured for public liability from negligent operation of vehicles subject to the federal rules, “regardless of whether or not each motor vehicle is specifically described in the policy.” Courts have mostly read it as a safety net for the public: it applies only when the policy doesn’t cover the accident and the carrier’s coverage falls short of the federal minimum.
It is not extra insurance for you. When the insurer pays a claim only because of the endorsement, it can seek repayment from the carrier, as IRMI and the court both describe. An unlisted truck or a symbol gap can still end up as your debt, which is why the covered-auto symbols on your policy matter.
What drives the cost of commercial auto liability?
There is no standard price, because insurers rate each operation. The Texas Department of Insurance describes how a liability rate for trucks, tractors, and trailers is usually built:
- Vehicle size and business use, plus the type of industry (truckers, manufacturers, contractors).
- Radius: heavier vehicles that regularly run beyond 200 miles are zone-rated.
- Limits, deductibles, and fleet size. In Texas, about 10.5% of truck, tractor, and trailer risks use a liability deductible.
- Your record: experience rating, schedule rating, and other modifiers, where your loss history and driver records come in.
The market adds pressure you can’t control. TDI found Texas commercial auto rates have risen 73% since 2017, and the state’s commercial auto combined ratio averaged 116% since 2011, meaning insurers paid out more in claims than they collected in premium.
Your safety record is the part you can move: roadside inspections and crashes feed the CSA scores underwriters read. See how CSA scores affect truck insurance premiums, and for 2026 benchmarks across every coverage, how much commercial truck insurance costs.
How to get commercial auto liability for your trucks
Step 1: Find your required limit
Start from the federal or state minimum for what you haul and where, then check the limits your brokers, shippers, and lender write into their contracts.
Step 2: Gather what underwriters ask for
Your DOT and MC numbers, operating radius, commodities, driver roster with motor vehicle records, unit schedule with VINs, garaging locations, and three to five years of loss runs if you have them.
Step 3: Fill the gaps around liability
Liability doesn’t cover your truck, your load, or your premises, so decide on physical damage, motor truck cargo, and general liability. Our commercial truck insurance page lists every line we place.
Step 4: Request your quote
Tell us what you haul and where. A licensed agent follows up with real options, and we handle the filings and certificates in-house. Before you dispatch, confirm your BMC-91 or BMC-91X shows on your FMCSA record.
Sources
The rules and figures on this page come from these official sources, checked on October 5, 2026.
- ISO Business Auto Coverage Form CA 00 01 10 13 (PDF, Sonoma County): The liability insuring agreement, defense, supplementary payments, who is an insured, exclusions, the per-accident limit, the out-of-state extension, insured contracts, and duties after an accident.
- ISO Commercial General Liability Coverage Form CG 00 01 04 13 (PDF, Sonoma County): The CGL auto exclusion, including loading and unloading, and the definition of loading or unloading.
- eCFR — 49 CFR 387.9, Financial responsibility, minimum levels: Federal minimums of $750,000, $1 million, and $5 million and who they apply to.
- eCFR — 49 CFR 387.303T, Security for the protection of the public: The $300,000 minimum for small-vehicle fleets, the authority minimums, and primary and excess security.
- eCFR — 49 CFR 387.7, Financial responsibility required: No operation without coverage, 35-day cancellation notice, and the MCS-90 kept at the principal place of business.
- FMCSA — Insurance Filing Requirements: BMC-91 and BMC-91X filings, the 20-day and 60-day deadlines for new applicants, the filing chart, and the carrier’s duty to keep filings current.
- McComb v. National Casualty Co., N.D. Ill. 2013 (PDF, govinfo): The MCS-90 payment language and the majority rule on when the endorsement applies and the insurer’s right to repayment.
- Texas Department of Insurance — Commercial Auto Biennial Report 2024 (PDF): Business auto and motor carrier policies, how truck liability is rated, deductibles, the $1 million median limit, rate changes, and the 116% combined ratio.
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Frequently asked questions
What is commercial auto liability insurance?+
It pays the damages you legally owe when your business vehicles injure people or damage their property in an accident, plus the cost of defending you, up to the policy limit. It does not pay for your own vehicles, your cargo, or injuries to your own employees.
Is auto liability the same as public liability for truckers?+
In trucking, yes in practice. Federal rules call the required coverage public liability, meaning liability for bodily injury and property damage including environmental restoration, and carriers meet it with an auto liability policy carrying the MCS-90 endorsement.
Who needs $300,000 in liability insurance?+
A for-hire carrier hauling non-hazardous freight across state lines whose fleet has only vehicles under 10,001 pounds GVWR. Once any vehicle is 10,001 pounds or more, the federal minimum is $750,000, and certain hazardous loads need $5 million even in lighter vehicles.
Does commercial auto liability cover my truck or my cargo?+
No. Liability excludes damage to property you own, transport, or have in your care, so your truck needs physical damage coverage and your load needs motor truck cargo coverage.
What is the MCS-90 endorsement?+
It is a federal endorsement attached to an interstate carrier’s liability policy that makes the insurer pay final judgments for public liability even for a vehicle not listed on the policy. If the insurer pays only because of the endorsement, it can seek repayment from the carrier.
What should I do after an accident to protect my liability claim?+
Give your insurer prompt notice of how, when, and where it happened, with names of injured people and witnesses, and send any legal papers right away. Don’t make payments or promises without the insurer’s consent, because the standard form lets it deny coverage if those duties aren’t met.
Does auto liability cover loading and unloading?+
Generally yes, while the load is being moved onto, carried in, or taken off the truck, including with a liftgate attached to it. Injuries from a forklift that isn’t attached to the truck fall under general liability instead.
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