The right amount of car insurance is enough liability coverage to protect your income and assets if you cause a serious crash, plus collision and comprehensive coverage whenever losing your own car would be a real financial blow. In practice that means carrying liability limits well above your state's bare minimum, adding physical damage coverage on any car you could not easily replace, considering uninsured motorist coverage for the driver who hits you with no insurance, and setting a deductible you could actually pay tomorrow. The exact numbers depend on what you own, what you drive, and how much risk you can absorb yourself. Here is how to work through each decision so you buy enough without overpaying for coverage you do not need.
Start With Liability, and Go Above the Minimum
Liability is the foundation of every policy and the coverage the law cares about most. It pays for the harm you cause others, and nearly every state requires it. As the Insurance Information Institute notes, nearly every state requires car owners to carry the following auto liability coverage[1], split into two parts. The National Association of Insurance Commissioners explains that there are two types of liability insurance under insurance policies: bodily injury and property damage[2], one for injuries you cause and one for property you damage.
The key decision is not whether to carry liability but how much. The state minimum is almost always too low for a serious accident, where a single injury claim can run into six figures. If the damage you cause exceeds your limits, you pay the rest personally, which can reach your savings, your home, and your future wages. This is why the Insurance Information Institute cautions that state-required minimums may not cover the costs of a serious accident, so it's worth considering purchasing higher levels of coverage[1]. The practical rule is to carry liability limits high enough to cover what you could lose, which for most people with any assets means well above the minimum. Our breakdown of what 50/100/50 liability limits mean shows how quickly those numbers get used up.
Decide Whether You Need Collision and Comprehensive
Liability does nothing for your own car. To cover your vehicle you add collision and comprehensive, the pair commonly called full coverage. Collision, as the National Association of Insurance Commissioners describes it, pays for damage to your car from a collision with another car, an object, a pothole, or flipping over[2]. Comprehensive covers almost everything else, paying for damage to your car that's not caused by a collision (wreck or crash), like theft, hail, windstorm, flood, fire, or impact by an animal[2].
Whether you need them comes down to a single question: could you afford to repair or replace your car out of pocket? If you finance or lease, the answer is made for you, since lenders almost always require both until the loan is paid off. If you own the car and it holds real value, the coverage is usually worth it because replacing the car yourself would hurt. Where it stops paying off is on an older, low-value car, since a claim can never exceed the car's actual cash value, which the Texas Department of Insurance defines as the cost to replace your car, minus depreciation[3]. Consumer Reports offers a usable rule for that point, suggesting you consider dropping the coverage when your annual premiums equal or exceed 10 percent of your car's book value, or the vehicle is more than 10 years old[4]. Our guides on state minimum versus full coverage and when to drop full coverage work through that math in detail.
Consider Uninsured Motorist and Other Protections
Beyond the core three, a few coverages protect you from other people's failures and your own injuries. The most important is uninsured and underinsured motorist coverage, which steps in when the driver who hits you has no insurance or not enough to cover your injuries. In that situation your own liability coverage does nothing for you, and without this protection you could be left paying for someone else's mistake. Some states require it; where it is optional, it is often worth carrying. Our guide on whether uninsured motorist coverage is worth it covers when it matters most.
Depending on your health insurance and your state, medical payments or personal injury protection can also be worth adding to cover your own and your passengers' medical costs after a crash regardless of fault. The point is not to buy every add-on, but to close the gaps that would genuinely hurt you: being hit by an uninsured driver, or facing medical bills your health plan handles poorly.
Choose a Deductible You Can Actually Pay
If you carry collision and comprehensive, your deductible is the last major decision, and it sets both your premium and your out-of-pocket cost on a claim. A higher deductible lowers your premium because you absorb more of any loss yourself. The Texas Department of Insurance describes the mechanic simply: on a claim the insurer will deduct your deductible from the claim amount[3] and pay the rest.
The right number is the most you could comfortably pay if you had a claim tomorrow, because that buys you the lowest premium you can safely carry. Setting a deductible so high that you could not actually cover it defeats the purpose, since you would be unable to use the coverage you are paying for. Our guide on how to choose your deductible walks through matching that number to your savings.
Putting It Together
The clean way to size a policy is to build it up in order. First, set your liability high enough to protect your income and assets, treating the state minimum as a floor to rise above rather than a target. Second, add collision and comprehensive if losing your car would be a genuine financial blow, and skip or drop them only on a car you could replace from savings. Third, add uninsured motorist coverage and any medical coverage that closes a real gap for you. Fourth, choose the highest deductible you could actually pay, to keep the premium as low as safely possible.
There is no single correct policy, because the right amount depends on your assets, your car, and your tolerance for risk. A driver with a paid-off older car and modest savings needs a very different policy from a homeowner with a new financed car and real assets to protect. Size it to what you could lose, not to what is cheapest, and revisit it when your car or finances change. If you want to trim the cost of whatever you land on, our guide on how to lower your car insurance premiums covers the levers that do not require cutting protection you need.
Frequently Asked Questions
Enough to cover what you could lose in a serious at-fault crash, which for most people with any savings or assets means limits well above the state minimum. Minimum limits can be exhausted by a single injury claim, leaving you personally responsible for the rest, so higher liability is usually worth the modest added cost.
You need collision and comprehensive whenever losing your car would be a real financial blow, and lenders require them on financed or leased cars. On an older, low-value car you could replace from savings, they may not be worth it, since a claim never pays more than the car's depreciated value. Decide based on whether you could absorb the loss.
Rarely as a complete plan. State minimum meets the law but often leaves your liability too low for a serious crash and provides nothing for your own car. It can be defensible only for a driver with few assets and an old, low-value car, and even then raising liability above the minimum is usually wise.
Often yes, and some states require it. It protects you when the driver who hits you has no insurance or too little to cover your injuries, a gap your own liability coverage does not fill. Where it is optional and affordable, it closes one of the most common and costly protection gaps.
Choose the highest deductible you could comfortably pay if you had a claim tomorrow. A higher deductible lowers your premium, but only helps if you can actually cover it when needed, so match it to your available savings rather than reaching for the lowest premium at any deductible.
Key takeaways
- ✓Size your policy to what you could lose, not to the cheapest option, and treat the state minimum as a floor to rise above.
- ✓Set liability limits high enough to protect your income and assets, since minimum limits are often too low for a serious crash.
- ✓Add collision and comprehensive whenever losing your car would hurt financially, and drop them only on a car you could replace from savings.
- ✓Consider uninsured motorist coverage, which is required in some states, to cover the driver who hits you with no insurance.
- ✓Choose the highest deductible you could actually pay tomorrow, since it lowers your premium only if you can cover it.
- ✓Revisit your coverage when your car or finances change, because the right amount shifts with what you own.