Car insurance is a deal between you and an insurance company: you pay them, and if something bad happens to your car — or because of it — they help cover the cost, up to your policy limits. What you pay is your premium. What you pay out of pocket before coverage kicks in is your deductible. Higher deductible, lower premium. Lower deductible, higher premium. It's a trade-off, not a trick.
Every policy is stacked the same way. Knowing which layer a coverage lives in tells you whether it's optional.
Almost every state makes you carry liability — the coverage that pays for the other person's car and injuries when you're at fault. Some states also require PIP, MedPay or UM/UIM on top. This is the floor, not the goal.
Financing or leasing? The bank owns most of that car, so they'll require comprehensive and collision until it's paid off. If your car is paid off, this layer is your call.
Everything you add because you'd rather not eat the loss yourself: comp and collision on a paid-off car, higher liability limits, UM/UIM, gap, rental, roadside. This is the layer people skip and regret.
What you pay monthly or every six months to keep the policy active. No premium, no coverage — and a lapse is one of the most expensive mistakes a new driver can make.
What you pay out of pocket before insurance covers the rest of a claim. Pick a higher one for a cheaper premium; pick a lower one if you'd rather pay less on the day something actually happens.
Depending on the coverages you choose, your insurer can help pay for damage or injuries you cause other people, repairs to your own car, your medical bills, and other accident-related costs.
Pays for the damage and injuries you cause someone else — including legal costs if you get sued.
Required in almost every state. It protects them, not your car.
Everything that isn't a crash: fire, hail, flood, theft, vandalism, a cracked windshield, a tree with bad timing.
Memory trick: comp is for chaos.
Your car, when you hit something — another car, a guardrail, a fence, a curb, or you flip it.
Memory trick: collision is for, wait for it, colliding.
Medical bills for you and your passengers after a crash, no matter who caused it.
Small limits, fast payouts.
Like MedPay but broader — can cover lost wages and some other costs, regardless of fault.
Required in no-fault states, optional or unavailable elsewhere.
Covers you when the person who hit you has no insurance or nowhere near enough. UMPD handles your car in that same situation.
Not required everywhere — see below for why you probably want it anyway.
Rental car reimbursement
Pays for a rental while your car is in the shop after a covered claim.
Roadside assistance
Flat tire, dead battery, lockout, out of gas. Cheap — but read the Insider Tips page first, because using it can create a claim record.
Loan/lease payoff (gap)
If your car is totaled or stolen and you owe more than it's worth, this covers the difference up to a limit.
Uninsured/underinsured motorist coverage pays when the driver who hit you has no policy — or a minimum policy that runs out halfway through your hospital bill. Plenty of states don't require it. That doesn't mean you don't need it: roughly one in seven U.S. drivers is estimated to be uninsured, and in the worst states it's closer to one in four. If you live somewhere with heavy crash volume and lots of uninsured drivers, UM/UIM is the cheapest serious protection on the whole policy.
Mississippi, New Mexico, and Michigan consistently top the list for uninsured-driver rates nationally. Tennessee isn't far behind. Florida and California don't top the uninsured-rate rankings, but they carry real risk for different reasons: Florida doesn't require bodily injury liability at all, and California's sheer population means a huge raw number of uninsured drivers even with a moderate rate. All six are worth carrying UM/UIM for.
Mississippi
One of the highest uninsured-driver rates in the country, paired with low minimum limits.
Michigan
High uninsured share in metro Detroit and complex no-fault PIP choices that leave gaps.
Tennessee
Consistently high uninsured rate and 25/50/25 minimums that a single ER visit blows through.
New Mexico
High uninsured rate plus above-average fatal crash rate per mile driven.
Florida
No bodily-injury liability requirement at all — just $10K PIP and $10K property damage.
California
Not top-tier by uninsured rate, but the largest raw number of uninsured drivers of any state — and minimums only rose in 2025, so they still run out fast in a serious crash.
Minimum coverage is not "covered."
If you cause a crash that costs more than your limits, the coverage stops and you don't. The other driver — or their insurer — can sue you for the rest, and a judgment can reach your savings, your paycheck through wage garnishment, and in some states other assets. The more you have to lose, the more coverage you should carry. Raising liability from a state minimum to 100/300/100 is usually one of the cheapest upgrades on your policy.
Risk rankings above are directional summaries of widely reported crash and uninsured-driver data, not exact current-year figures. Check your own state's page for verified minimums.
Look up my state's minimumsThis is general info to help you understand insurance basics — not an actual policy, and it doesn't override the terms of any real one. Coverage details vary by state and insurer, so always check your actual policy or talk to a licensed rep.