Commercial Auto Liability Insurance
The legally required foundation of every trucking policy: it pays for injuries and property damage your truck causes to others, and for your legal defense. Coast has placed it for truckers since 1976.
- Same-day certificates, most within 2 hours
- Salaried, non-commissioned agents
- No broker fees
This page provides general information only and is not a quote, binder, or offer of coverage. Talk to a licensed agent about your specific situation.
What is commercial auto liability insurance?
Commercial auto liability is the coverage the law requires before your truck can operate for hire. When your truck injures someone or damages their property, it pays the other party’s medical bills, repair costs, and — just as important — your legal defense. It is the coverage your operating authority, your customers, and your lender all depend on seeing.
What it doesn’t do is protect your own equipment or cargo: those need physical damage and motor truck cargo coverage. Auto liability protects everyone else on the road from you — and protects your business from what a serious at-fault accident would otherwise cost.
What your auto liability policy actually does
Pays for bodily injury
Medical bills, lost wages, and related damages for people injured in an accident your truck causes.
Pays for property damage
Other vehicles, buildings, cargo belonging to others, road fixtures — whatever your truck damages.
Pays for your legal defense
Defense costs are typically paid in addition to your policy limits — attorneys, experts, and court costs don’t eat into the coverage available for the claim itself.
Duty to defend
Your carrier must defend you when a covered claim is filed, and controls the legal strategy — you aren’t paying lawyers out of pocket while a case drags on.
Settlement authority
Carriers can generally settle within your limits without your sign-off. It protects you from runaway judgments — and it’s one more reason limits should match your real exposure.
What it never covers
Your own truck, your trailer, and the freight you haul. Those belong to physical damage and motor truck cargo coverage.
Whose policy is it — yours or the motor carrier’s?
Carriers running under their own MC number
You must carry your own auto liability at or above the federal minimum for what you haul, with the filings that prove it. It’s the coverage your authority is built on.
Owner-operators leased to a carrier
The motor carrier usually provides primary auto liability while you’re under dispatch. Your gap is everything outside dispatch — that’s bobtail and non-trucking liability territory.
New authorities
Liability with the right filings is the first coverage a new authority needs active — nothing moves until it’s in place. Coast works with new ventures every week and knows the sequence.
Operators with shipper or broker contracts
Contracts often require limits above the legal minimum — $1 million is the most common ask. Your contracts, not just the law, should drive the limit you carry.
What determines your auto liability premium
Liability premiums vary widely between operations that look similar on paper. Here’s what actually separates them — quote your real operation and you’ll typically have an initial number within 24 hours and a complete proposal within 3–5 business days.
A clean record, an established authority, and multi-truck operations generally work in your favor. New authorities pay more at first; rates typically improve after the first clean year.
Start your auto liability quote
Tell us about your operation, your authority, and what your contracts require.
Umbrella and excess: when primary limits aren’t enough
Verdicts and settlements in serious truck accidents regularly exceed primary policy limits. Excess coverage adds more dollars on top of your existing limits; umbrella coverage adds dollars and can also respond to some claims your underlying policies don’t. For many trucking operations, the question isn’t whether the minimum is legal — it’s whether your limits would survive your worst realistic accident. A Coast agent can walk through that math with you honestly, with no pressure to buy more than your operation calls for.
What the law requires
Federal minimums for interstate for-hire trucking are set by 49 CFR § 387.9: $750,000 for general freight, $1,000,000 for oil transport, and $5,000,000 for certain hazardous materials. Many shippers, brokers, and lease agreements require $1,000,000 regardless of the legal floor — check your contracts.
Interstate authority also involves the MCS-90 endorsement. It’s widely misunderstood: MCS-90 is a public-protection guarantee, not extra coverage for you. It commits your insurer to pay a final public-liability judgment up to the federal minimum even when the claim would otherwise fall outside your policy — and the insurer can then seek reimbursement from you. It raises the stakes of carrying the right coverage; it doesn’t raise your limits.
State-level requirements and filings vary — intrastate minimums, state filing forms, and program rules differ from state to state. Coast is licensed in 35 states and handles the federal and state filings that apply to your operation; see our Service Area for the state list.
Trucking operations that need auto liability coverage
Related truck insurance coverages
Verify current requirements at the source
Insurance, registration, and filing rules change. These official and authoritative sources carry the current requirements and research cited on this page.
Auto liability insurance FAQs
How much auto liability insurance does the law require?
For interstate for-hire trucking, federal minimums under 49 CFR § 387.9 are $750,000 for general freight, $1,000,000 for oil, and $5,000,000 for certain hazardous materials. Intrastate minimums vary by state, and contracts often require more than the legal floor.
Does the MCS-90 endorsement increase my coverage?
No. MCS-90 guarantees the public that a final judgment will be paid up to the federal minimum even if the claim falls outside your policy — and your insurer can seek that money back from you. It protects the public, not you, which is why your actual policy limits matter so much.
Is auto liability insurance enough by itself?
It satisfies the law, but it pays nothing for your own truck, trailer, or cargo. Most operations pair it with physical damage and motor truck cargo coverage, and many add umbrella limits above it.
I'm leased on to a motor carrier — do I need my own auto liability?
Usually the carrier’s policy provides primary liability while you’re under dispatch. Your exposure is outside dispatch — deadheading, personal use, between loads — which is what bobtail and non-trucking liability cover.
How fast can I get proof of coverage?
Same day — most certificates within 2 hours of the request, and initial quotes typically within 24 hours.
Reviewed by Scott W. Powers, Licensed Insurance Agent (NPN 9719382). Last reviewed August 2026.
Get your auto liability quote today
Our job is to get your liability program right — limits, filings, and all — not to upsell you. Family-owned since 1976, licensed in 35 states, salaried non-commissioned agents, no broker fees. Call (800) 348-0017 or email quote@coasttransport.com and expect an initial quote back in about a day.