What car insurance does and why you need it
Car insurance is a contract between you and an insurance company: you pay a monthly or annual fee (called a premium), and the company agrees to pay for certain costs if you cause an accident, hit someone else's car, or your car is damaged or stolen. The insurance company does not pay for your own repairs if the accident is your fault — it pays the other person's medical bills, car repairs, or legal costs if you are found responsible.
Every state except New Hampshire requires you to carry at least a minimum amount of liability insurance before you can legally drive. Liability insurance covers damage or injury you cause to someone else. If you finance or lease a car, your lender will also require you to carry collision and comprehensive coverage to protect their investment in the vehicle.
The reason insurance exists is straightforward: if you cause a serious accident, the costs can reach hundreds of thousands of dollars. Without insurance, you would pay those costs out of your own pocket, which could mean losing your home, your wages, or your ability to work. Insurance spreads that risk across many drivers so no single person bears the full weight of a catastrophic accident.
Key Takeaways
- Liability insurance is required by law in every state except New Hampshire and covers damage or injury you cause to someone else.
- Collision and comprehensive coverage protect your own car but are only required if you have a loan or lease on the vehicle.
- Your premium depends on your age, driving record, the car you drive, where you live, and how much coverage you choose.
- Deductibles let you pay less per month in exchange for paying more out of your pocket when you file a claim.
- Shopping around and bundling home and auto policies can lower your premium by 10 to 25 percent, depending on the insurer.
The three main types of coverage and what they pay for
Liability insurance covers medical bills, lost wages, and property damage if you cause an accident and are found responsible. Every state sets a minimum amount you must carry — typically $25,000 to $100,000 per person injured and $50,000 to $300,000 per accident, depending on your state. These minimums are often too low to cover a serious injury, so many people buy higher limits. You choose your liability limit when you buy a policy.
Collision coverage pays to repair or replace your car if you hit another vehicle, a tree, a guardrail, or any other object — regardless of who is at fault. If you cause the accident, your own collision coverage pays for your repairs (minus your deductible). If someone else hits you, their liability insurance should pay, but if they are uninsured or underinsured, your collision coverage protects you.
Comprehensive coverage pays for damage to your car from events other than collisions: theft, vandalism, weather (hail, flooding, wind), hitting an animal, or falling objects. Like collision, you pay a deductible before the insurance company pays the rest. Comprehensive and collision are often sold together as a package.
You may also see uninsured or underinsured motorist coverage on your policy. This covers your medical bills and car damage if you are hit by a driver who has no insurance or not enough insurance to cover your costs. It is required in some states and optional in others.
How your premium is calculated
Insurance companies use several factors to decide how much you pay each month. Your age and driving record matter most: younger drivers and drivers with accidents or traffic violations pay significantly more because statistics show they file more claims. A single at-fault accident can raise your premium for three to five years.
The car you drive affects your rate because some vehicles cost more to repair, are stolen more often, or are involved in more accidents. A sports car or a luxury sedan will cost more to insure than a practical sedan or truck. Insurance companies have databases showing repair costs and theft rates for each make and model.
Your location influences your premium because some areas have more accidents, theft, or vandalism than others. Urban areas typically cost more than rural areas. Even moving from one city to another can change your rate.
Your coverage choices directly affect what you pay. Higher liability limits, lower deductibles, and adding comprehensive or collision coverage all increase your premium. You control these choices when you buy or renew your policy.
Deductibles: trading monthly cost for out-of-pocket cost
A deductible is the amount you agree to pay out of your pocket before the insurance company pays the rest. If you have a $500 deductible and your car needs $3,000 in repairs after an accident, you pay $500 and the insurance company pays $2,500.
Higher deductibles mean lower monthly premiums. A $1,000 deductible will cost you less per month than a $250 deductible, but you will pay more if you file a claim. The trade-off makes sense if you have savings to cover a deductible and do not file claims often. If you have little savings or a history of accidents, a lower deductible protects you from a large unexpected bill.
Deductibles explore separately to collision, comprehensive, and sometimes uninsured motorist coverage. Your liability coverage has no deductible — the insurance company pays the full amount up to your chosen limit.
How to lower your premium
The most direct way to lower your premium is to shop around. Insurance rates vary widely between companies for the same driver and car, sometimes by hundreds of dollars per year. Getting quotes from at least three insurers takes 15 to 30 minutes online and can show you the real difference in cost.
Bundling your car and home insurance with the same company often gives you a discount of 10 to 25 percent on both policies. Some insurers also offer discounts for completing a defensive driving course, having a clean driving record for several years, paying your premium in full upfront instead of monthly, or installing anti-theft devices in your car.
Raising your deductible lowers your monthly payment when ready, but only do this if you have savings set aside to cover it. Dropping collision or comprehensive coverage on an older car that is paid off can also reduce your premium, though you lose protection if the car is damaged or stolen.
Some insurers offer usage-based programs where they track your driving through an app or device and give you a discount if you drive safely and less frequently. These programs typically offer discounts of 10 to 30 percent, but they require you to share location and driving data with the company.
What happens when you file a claim
If you are in an accident, the first step is to call your insurance company and report it. Most insurers have a 24-hour claims line. You will need to describe what happened, provide the other driver's information (if applicable), and answer questions about injuries or damage.
The insurance company will assign an adjuster to your claim. The adjuster inspects the damage, reviews police reports if there is one, and determines how much the company will pay. This process usually takes a few days to a few weeks. If the damage is minor, you may be able to get an estimate online or by photo.
Once the adjuster approves the claim, you have choices about how to repair the car. You can use the insurance company's preferred repair shop, choose your own mechanic, or take the payment and repair it yourself. If the car is totaled (the cost to repair exceeds its market value), the insurance company pays you the car's current value minus your deductible, and you sign the title over to them.
Understanding your policy documents
Your insurance policy comes with several documents that spell out exactly what is and is not covered. The declarations page lists your coverage types, limits, deductibles, and premium. The policy form contains the detailed rules and exclusions — for example, most policies do not cover damage from normal wear and tear, racing, or using your car for commercial delivery.
Read the section on exclusions carefully because it tells you what the insurance company will not pay for. Common exclusions include damage from driving under the influence, using your car for rideshare or delivery without a commercial policy, and damage from mechanical failure (as opposed to collision or weather).
If you do not understand something in your policy, call your insurance agent or company and ask. It is better to know the limits of your coverage before you need to file a claim than to discover them afterward.
Frequently Asked Questions
What is the difference between liability and collision coverage?
Liability pays for damage or injury you cause to someone else. Collision pays for damage to your own car when you hit something. If you cause an accident, the other person's liability insurance (or yours, if they sue) covers their costs, and your collision coverage covers your repairs.
Do I need comprehensive and collision if my car is paid off?
You are not required to carry them, but you lose protection if your car is damaged or stolen. If your car is worth less than a few thousand dollars, the cost of collision and comprehensive may not be worth the protection. If your car is newer or worth more, these coverages protect you from a large unexpected expense.
How long does an accident stay on my driving record?
An at-fault accident typically affects your insurance rates for three to five years, depending on your state and insurer. After that time, the accident usually stops influencing your premium, though it may remain on your driving record longer. A clean record for several years can earn you a discount.
Can I change my coverage or deductible mid-policy?
Yes, most insurers let you change your coverage or deductible at any time, though the change usually takes effect the next day. Lowering your deductible or adding coverage will increase your premium for the rest of the policy period. You can also shop for a new policy with different coverage whenever your current one renews.
What should I do if I am hit by an uninsured driver?
Report the accident to your insurance company right away. If you have uninsured motorist coverage, it will pay for your medical bills and car damage up to your coverage limit. If you do not have it, you may be able to pursue the other driver in small claims court, though collecting money can be difficult.