---
title: "What does primary auto liability cover for a trucking company?"
description: "Primary auto liability pays for injury and damage your truck causes to others. What it covers, what it leaves out, and the federal minimums."
canonical: "https://www.breadroute.co/blog/commercial-auto-insurance-small-business"
author: "Blake Tawney"
category: "Insurance"
tags: ["new-authority", "small-fleets", "otr-and-local-haul"]
published: "2026-05-23"
updated: "2026-10-25"
---

## What does primary auto liability pay for?

It pays for harm your truck does to other people. If you rear-end a car, clip a guardrail, or back into a dock, the injured people and the owners of the damaged property can hold you responsible. Primary auto liability is the policy that generally responds to those claims, up to its limit, after its terms and exclusions.

Under most trucking policies, that means:

- **Bodily injury to others.** Medical bills, lost wages, and damages for people hurt in an accident with your truck.
- **Property damage to others.** Their vehicles, buildings, fences, signs, and road fixtures.
- **Legal defense.** Many policies pay to defend you against covered claims. Read whether defense costs sit inside the limit or on top of it.

Federal rules use the term "public liability," defined as liability for bodily injury or property damage, including liability for environmental restoration, such as cleanup after a spill (49 CFR 387.5). That is the risk this coverage exists for.

"Primary" means this policy pays first, before any umbrella or excess layer. "Commercial auto" is the broader name for business vehicle policies, and in trucking the liability part of it is usually what people mean by primary auto liability. See our [primary auto liability page](/insurance/primary-auto-liability) for the product overview.

## What does the federal rule require?

No motor carrier may operate a motor vehicle until it has the minimum level of financial responsibility in effect (49 CFR 387.7(a)). The rules reach for-hire carriers hauling property in interstate or foreign commerce, and to carriers hauling hazardous materials (49 CFR 387.3). The minimums are set in 49 CFR 387.9:

| Type of carriage | What you haul | Federal minimum |
|---|---|---|
| For-hire, interstate or foreign, 10,001 pounds GVWR or more | Nonhazardous property | $750,000 |
| For-hire and private, 10,001 pounds GVWR or more | Oil and hazardous materials not in the higher tier | $1,000,000 |
| For-hire and private, 10,001 pounds GVWR or more (this tier also reaches some smaller vehicles) | Certain bulk hazardous materials, explosives, poison gas, and highway route controlled radioactive material | $5,000,000 |

These are regulatory floors, not prices and not recommendations. Vehicles under 10,001 pounds GVWR are generally outside these rules, with exceptions for certain dangerous materials (49 CFR 387.3(c)). Operations inside one state follow state rules, which we did not review here, so check your state agency.

**How proof gets on file.** Your insurer files a certificate with FMCSA, usually a BMC-91 or BMC-91X, and the policy carries an MCS-90 endorsement. FMCSA will not grant operating authority until the minimum is on file. We walk through it in [how trucking insurance gets filed with FMCSA](/blog/how-trucking-insurance-gets-filed-with-fmcsa).

## What does the MCS-90 endorsement do?

The MCS-90 is worth understanding, because it is not extra coverage for you. It is a promise to the public.

Under the form's wording, the insurer agrees to pay, within the limits stated, any final judgment against the insured for public liability from negligence in the operation, maintenance, or use of covered motor vehicles, "regardless of whether or not each motor vehicle is specifically described in the policy." The form also says no condition or limitation in the policy relieves the insurer of that duty to the injured party.

Then comes the part carriers miss. The insured agrees to reimburse the insurer for any payment it would not have had to make except for the endorsement. In plain terms: if your policy would not have covered a claim, say an unlisted truck, the MCS-90 may still get the injured person paid, and the insurer can come back to you for the money.

The form also says the endorsement does not extend to injury to your own employees on the job, or to property you haul as cargo. Cancellation takes 35 days' written notice between the insurer and the insured, and 30 days' notice to FMCSA for carriers subject to registration.


## How much liability coverage do I need?

The federal minimum is where the law starts, not where your customers stop. In practice, the limit you carry is usually set by three groups:

- **Brokers and shippers.** Carrier packets and contracts often list a required liability limit, sometimes higher than the federal floor. Read each one.
- **Lenders and lessors.** A financing or lease agreement may set insurance requirements for the unit and how the lender is named on the policy.
- **You.** A serious crash can produce claims well beyond a minimum limit. Whatever a policy does not pay can come back to the business.

Limits are written in different ways. A combined single limit is one number per accident for injury and property damage together. Split limits set separate caps. Ask how yours is written, and whether an umbrella or excess layer makes sense once you know what your contracts ask for. We do not state a number for you, because it depends on what you haul, where, and for whom.

The tool below asks five short questions about your operation and lists the coverages that usually come up, what federal rules require, and what contracts commonly ask for. It shows no prices.

## What does primary auto liability leave out?

Policies vary. Read your declarations, definitions, and exclusions. Common gaps:

- **Your own truck and trailer.** Damage to your equipment is [physical damage](/insurance/physical-damage).
- **The freight.** Loss or damage to the load is [motor truck cargo](/insurance/motor-truck-cargo). See [whether you need cargo insurance](/blog/do-i-need-motor-truck-cargo-insurance).
- **Your own injuries and your drivers' injuries.** That is [workers' compensation](/insurance/workers-compensation) for employees, or [occupational accident](/insurance/occupational-accident) for independent contractors. See [how the two compare](/blog/occupational-accident-vs-workers-comp-owner-operators).
- **Trailers you pull but do not own.** That is usually [trailer interchange](/insurance/trailer-interchange).
- **Unlisted units and drivers.** Many trucking policies list each power unit and listed driver. A unit or driver outside the schedule can create a gap between you and your insurer, even where the MCS-90 protects the public.
- **Operations the policy does not describe.** A different radius, commodity, or type of haul than the one you described when the policy was written.
- **Intentional acts, and some pollution and hazardous-material losses,** depending on the policy and endorsements.

Two problems deserve a check: the wrong description of the operation, and a unit or driver missing from the schedule. Check both when the policy is issued and every time you add a truck or driver.

## What if I am leased onto a carrier?

Then the carrier holds the authority and, under federal leasing rules, its lease must clearly specify its legal obligation to maintain insurance for the protection of the public. The lease must also say who provides any other coverage for the leased equipment, such as bobtail insurance, and spell out any amount charged back to you for insurance (49 CFR 376.12(j)(1)).

So while you are under the carrier's dispatch, its primary liability usually responds. When you are not, such as driving home empty or on a personal errand, you may need [bobtail or non-trucking liability](/insurance/bobtail-and-non-trucking-liability). The difference is explained in [bobtail vs non-trucking liability](/blog/bobtail-vs-non-trucking-liability-insurance). None of that becomes your own primary liability if you later get your own authority. You start a new policy then.

## FAQ

### Is primary auto liability the same as commercial auto insurance?

Often, in trucking, yes. Commercial auto is the broad name for business vehicle policies. Primary auto liability is the liability part for trucks you operate. What a given policy includes is set by its terms.

### Is $750,000 enough?

It is the federal minimum for a for-hire carrier hauling nonhazardous property in a vehicle of 10,001 pounds or more. It is a floor, not advice. Brokers, shippers, and lenders often require more, and a serious crash can exceed it.

### Does primary liability cover my own truck?

No. It pays other people. Damage to your own truck is physical damage, a separate coverage.

### What happens if my policy is cancelled?

Under the federal rule and the MCS-90 form, cancellation takes 35 days' written notice between you and the insurer, and the form requires 30 days' notice to FMCSA for registered carriers. FMCSA can begin revocation if your required filing is not kept on file, so do not let coverage lapse.

### Does BreadRoute sell liability insurance?

No. BreadRoute is not a licensed insurance agency and does not sell insurance. If you start an insurance request, it goes to licensed partners, who handle any coverage options.

## Bottom line

Primary auto liability pays for injury and damage your truck causes to others, and federal rules require a minimum before you operate. It does not cover your truck, your freight, or your own injuries. Carry the limit your contracts require, keep every unit and driver on the schedule, and read the MCS-90 so you know what it does and does not do for you.