How Much Car Insurance Do You Actually Need? A Coverage Checklist

State minimum liability limits protect you from a citation, not from a lawsuit. If you cause an accident with injuries that exceed your policy limit, you can be personally sued for the difference — which means the right coverage amount depends on what you have to protect, not just what your state requires. For the full coverage breakdown, see our coverage types pillar guide.

The checklist

Why "just the state minimum" is a risky default

State minimums were set as a legal floor for financial responsibility, not as a recommendation for how much coverage is actually adequate. In several states in this guide, the jump from minimum liability to a much higher limit (like 100/300/100) costs surprisingly little — sometimes just $20-$40 more a month — which means the real cost of being underinsured isn't the premium you'd save, it's the personal liability exposure you'd carry if a serious accident happened.

Use the calculator to size your liability limits

Rather than guessing, our liability coverage calculator takes your total assets, annual income, and state minimum, and estimates a liability limit that actually reflects what you have to protect — rounded to the standard policy limits insurers actually sell (25k/50k/100k/250k/ 500k/1M), rather than an arbitrary number.

Special situations worth a second look

• Financed or leased vehicle: collision, comprehensive, and often gap insurance are lender requirements, not optional extras.
• High-value assets (home equity, savings, business ownership): higher liability limits are worth the relatively small added premium — a lawsuit judgment can attach to assets well beyond your policy limit.
• No car, but occasional driving: see our non-owner insurance guide rather than assuming you need a standard owner's policy.
• Recent DUI or accident: coverage needs don't change, but where you can buy it does — see best companies for DUI drivers.

Frequently asked questions

Is state minimum coverage enough car insurance?+

It satisfies the legal requirement to drive, but state minimums are set as a financial-responsibility floor, not a recommendation. If you cause an accident with damages exceeding your limits, you can be personally sued for the difference, which is a real risk for anyone with meaningful assets or income.

How do I know how much liability coverage to buy?+

A common rule of thumb is to size your liability limits to cover your net assets plus a buffer of future income at risk in a lawsuit, rounded up to a standard policy limit. Our liability coverage calculator automates this estimate based on your specific numbers.

Does more coverage always cost a lot more?+

Not proportionally. In several states, moving from minimum liability to a much higher limit costs only $20-$40 more per month, because the statistical likelihood of a catastrophic claim is low even though the potential payout is high — insurers price the jump accordingly.

Do I need full coverage if my car is old and paid off?+

Not necessarily. If the collision/comprehensive portion of your premium approaches roughly 10% of your car's actual cash value, some drivers choose to self-insure that risk with liability-only coverage instead — see our liability vs. full coverage comparison for the full breakdown.