What automobile liability insurance does

Automobile liability insurance pays for injuries and property damage you cause to other people when you're at fault in a car accident. It does not pay for damage to your own vehicle or injuries to you — that's what collision, comprehensive, and medical payments coverage handle. Liability is the foundation of car insurance because every state except New Hampshire requires you to carry it before you can legally drive.

When you hit another car, injure a pedestrian, or damage someone's fence, your liability insurance covers their medical bills, lost wages, vehicle repairs, and legal costs if they sue. The insurance company also pays for your legal defense. Without it, you would pay these costs out of your own pocket, and a serious accident could result in wage garnishment or a lien against your home.

Liability coverage comes in two parts: bodily injury liability, which covers injuries to people, and property damage liability, which covers damage to things like vehicles, buildings, and fences. You choose separate limits for each, written as something like 25/50/25, meaning $25,000 per person for bodily injury, $50,000 total per accident for bodily injury, and $25,000 for property damage.

Key Takeaways

  • Liability insurance covers injuries and property damage you cause to others, not damage to your own vehicle or injuries to yourself.
  • Every state except New Hampshire requires you to carry liability insurance before you can register and legally drive a vehicle.
  • You choose separate dollar limits for bodily injury per person, bodily injury per accident, and property damage, and higher limits cost more but protect you better in serious accidents.
  • If you cause an accident that exceeds your liability limits, you are personally responsible for the difference, which can lead to wage garnishment or liens against your assets.
  • An umbrella policy can cover costs above your auto liability limits for a relatively low additional premium.

State minimum requirements and how they vary

Every state sets its own minimum liability limits, and they differ significantly. Most states require at least 15,000 or 25,000 per person for bodily injury and 30,000 or 50,000 total per accident. Property damage minimums typically range from 10,000 to 25,000. New Hampshire is the only state that does not require liability insurance, though you must still prove you can pay for damages if you cause an accident — usually through a bond or proof of assets.

The minimums are often too low to cover a serious accident. A single hospitalization can easily exceed 25,000, and if you injure multiple people or cause significant property damage, you can be liable for hundreds of thousands of dollars. Insurance companies recommend limits of at least 100,000 per person and 300,000 per accident, especially if you have assets to protect.

You can find your state's specific minimums on your state insurance commissioner's website or by calling your state's Department of Insurance. When you buy a policy, your insurer will show you the state minimum and let you choose higher limits. The difference in premium between the minimum and a higher limit is usually modest — often 15 to 30 dollars per six months — but the protection difference is enormous.

How liability limits work in an accident

Liability limits are the maximum your insurance company will pay for a single accident. If you cause a crash that injures three people, your bodily injury limit is split among them. If the limit is 50,000 total and medical bills come to 60,000, your insurance pays 50,000 and you owe the remaining 10,000.

The insurance company will defend you in court and negotiate settlements with the other party's lawyer. If a lawsuit goes to trial and a judge awards damages above your limit, you are personally responsible for the excess. This is called being underinsured, and it can result in a judgment against you that leads to wage garnishment, bank account levies, or a lien on your home — depending on your state's laws.

Some states allow injured parties to go after your personal assets when ready after a judgment. Others require a separate collection process. Either way, a single serious accident can have financial consequences for years. This is why many financial advisors recommend carrying limits well above the state minimum if you own a home or have savings.

Bodily injury versus property damage liability

These two types of liability coverage work the same way but cover different things. Bodily injury liability covers medical expenses, rehabilitation, lost income, and pain and suffering for people you injure. Property damage liability covers repair or replacement of vehicles, buildings, fences, utility poles, and other physical property.

Bodily injury claims tend to be more expensive than property damage claims because they can include ongoing medical care, disability, and legal settlements for pain and suffering. A serious injury can result in claims of 100,000 or more. Property damage is usually limited to the actual cost of repair or replacement, though it can still be substantial — totaling a new car costs 30,000 to 60,000 depending on the vehicle.

You set separate limits for each type. Some people choose lower property damage limits because they assume they'll only hit one car at a time, but you could damage multiple vehicles in a single accident, or hit an expensive car. Most insurers recommend at least 25,000 for property damage, and many recommend 50,000 or higher if you live in an area with expensive vehicles or high medical costs.

What liability insurance does not cover

Liability insurance covers damage you cause to others, not damage to your own vehicle or injuries to yourself. If you hit a tree, your liability insurance will not pay to fix your car — that's what collision coverage does. If you're injured in the accident, your liability insurance will not pay your medical bills — that's what medical payments coverage or personal injury protection does, depending on your state.

Liability also does not cover intentional damage. If you deliberately hit someone's car or property, your insurance company can deny the claim and refuse to defend you. It also does not cover business use — if you use your personal car for rideshare or delivery, you need commercial coverage. Most personal auto policies exclude business use, and using your car for work without the right coverage can void your policy.

Liability does not cover traffic violations, parking tickets, or towing costs. It also does not cover damage caused by uninsured or underinsured drivers hitting you — that's what uninsured motorist coverage and underinsured motorist coverage do. These are separate add-ons that protect you when the other driver doesn't have enough insurance.

How your premium is calculated

Your liability insurance premium depends on several factors: your age, driving record, the type of vehicle you drive, where you live, how much you drive, and the limits you choose. Younger drivers and those with accidents or violations pay significantly more. Urban areas typically cost more than rural areas because there are more cars and more accidents. A sports car costs more to insure than a sedan.

The limit you choose directly affects your premium. Doubling your bodily injury limit from 25,000 to 50,000 usually costs 10 to 30 dollars more per six months, depending on your insurer and state. Raising it to 100,000 or 250,000 costs more but is still often under 50 dollars extra per six months. The relationship is not linear — the jump from 25,000 to 50,000 costs more per dollar of coverage than the jump from 100,000 to 250,000.

You can lower your premium by raising your deductible, bundling auto and home insurance, maintaining a clean driving record, taking a defensive driving course, or paying your premium in full rather than monthly. Some insurers offer discounts for low mileage, good grades (for young drivers), or safety features on your vehicle. It's worth getting quotes from multiple insurers because rates vary widely for the same coverage.

Umbrella insurance as additional protection

An umbrella policy is additional liability coverage that sits on top of your auto, home, and other policies. It covers claims that exceed your underlying limits. If you cause an accident with 150,000 in damages and your auto liability limit is 100,000, your umbrella policy covers the remaining 50,000 (minus any deductible).

Umbrella policies typically start at 1 million in coverage and cost 150 to 300 dollars per year, depending on the amount of coverage and your insurer. They're most useful if you have significant assets to protect — a home, savings, investments, or a business. If you're sued and a judgment exceeds your auto liability limit, an umbrella policy can prevent a lien against your home or wage garnishment.

Most insurers require you to carry minimum underlying limits on your auto policy before they'll sell you an umbrella. They typically want at least 100,000 per person and 300,000 per accident for auto liability. This requirement actually works in your favor because it ensures you have solid baseline coverage before the umbrella kicks in.

Frequently Asked Questions

What happens if I cause an accident and don't have liability insurance?

You are breaking the law in every state except New Hampshire. You face fines, license suspension, and potential jail time depending on your state and whether anyone was injured. You're also personally liable for all damages, which can result in a judgment against you, wage garnishment, and liens on your property. If you're caught driving without insurance, your state may require you to file an SR-22 form with the DMV, which certifies that you have insurance before you can legally drive again.

Can my liability insurance cover a friend driving my car?

Yes, in most cases. Your liability policy covers anyone driving your car with your permission, as long as they have a valid license. The coverage follows the car, not the driver. However, if someone regularly borrows your car, your insurer may require you to add them to your policy. If you lend your car to someone who causes an accident, your liability insurance pays first, and then the other driver's insurance may be secondary.

What's the difference between liability and collision coverage?

Liability covers damage you cause to other people and their property. Collision covers damage to your own vehicle from hitting another car or object. If you hit a parked car, your liability pays for their repairs and your collision pays for yours. Collision is optional if you own your car outright, but required if you have a loan or lease. Liability is required by law in almost every state.

Will my rates go up after an accident where I was at fault?

Yes, in most cases. An at-fault accident typically increases your premium by 20 to 40 percent for three to five years, depending on your insurer and state. The increase is larger if the accident involved injuries or significant property damage. Some insurers offer accident forgiveness programs that waive the increase if it's your first accident in a certain number of years, but you usually have to pay extra for this coverage upfront.

What if the other driver's insurance company says I'm at fault but I disagree?

Your own insurance company will investigate and defend you. Tell your insurer when ready and provide a detailed account of the accident, photos, and any witness information. Your insurer has a legal duty to defend you fairly, even if the other side disagrees about fault. If liability is unclear, your insurer may negotiate a settlement or go to trial. You should not admit fault or sign anything without talking to your insurer first.