Almost every state requires drivers to carry some auto liability insurance, but the legal minimum is rarely enough to protect your finances if you cause a serious accident. The right amount of car insurance depends on your state's requirements, your lender or lease terms, your assets, and your tolerance for risk. This guide walks through how to calculate coverage limits that actually protect you.
Start With Your State's Minimum Requirements
Forty-nine states and the District of Columbia require liability coverage; New Hampshire is the only state that does not mandate it for most drivers. Minimums are typically written as three numbers, such as 25/50/25, which means:
- $25,000 for bodily injury per person
- $50,000 for bodily injury per accident
- $25,000 for property damage per accident
These limits vary widely. California requires 15/30/5, while Maine requires 50/100/25. The Insurance Information Institute notes that many states have not raised minimums in decades, even as medical and repair costs have climbed. Meeting the minimum keeps you legal, but it does not keep you protected.
Why Minimum Coverage Usually Isn't Enough
If you cause an accident and the damages exceed your liability limits, you are personally responsible for the difference. A single emergency room visit, surgery, or totaled vehicle can easily surpass a 25/50/25 policy. The other driver's insurer can sue you for the shortfall, and a judgment can follow you for years, potentially leading to wage garnishment or a lien on your home.
A common rule of thumb is to carry liability limits at least equal to your net worth, so a lawsuit cannot wipe out your savings. If your net worth is modest, a practical benchmark is 100/300/100 — $100,000 per person, $300,000 per accident, and $100,000 for property damage. Drivers with significant assets often buy 250/500/250 or add an umbrella policy for extra protection.
What Lenders and Leases Require
If you finance or lease a vehicle, the lender will require more than liability coverage. Expect to carry:
- Collision coverage to repair or replace your vehicle after a crash
- Comprehensive coverage for theft, weather, fire, and vandalism
- Gap coverage if you owe more than the car is worth
These requirements apply until the loan is paid off. Once the vehicle is yours outright, collision and comprehensive become optional, though they are often worth keeping on a newer car.
Coverage Types You Should Consider
Uninsured and Underinsured Motorist Coverage
About 1 in 7 drivers is uninsured, according to the Insurance Research Council. Uninsured motorist coverage pays for your injuries when a hit-and-run or uninsured driver is at fault. Underinsured motorist coverage kicks in when the at-fault driver's limits are too low to cover your costs. In some states, this coverage is required; in others, you must opt in.
Personal Injury Protection (PIP) or Medical Payments
PIP covers medical bills, lost wages, and related expenses regardless of fault in no-fault states. Medical payments coverage serves a similar purpose in at-fault states. Both can reduce out-of-pocket costs after an accident.
Umbrella Policies
An umbrella liability policy adds $1 million or more of protection above your auto and home limits. It is relatively inexpensive and valuable for drivers with substantial assets or a high income.
How to Decide on Your Limits
Work through these steps:
- Check your state's minimum requirements and treat them as a floor, not a target.
- Add up your net worth, including home equity, investments, and savings.
- Set bodily injury limits at or above that number.
- Confirm your lender's requirements if you finance or lease.
- Price out uninsured motorist, PIP, and umbrella coverage.
- Raise your deductible if you want to lower premiums, but keep enough cash to cover it.
Increasing liability limits from state minimums to 100/300/100 often costs only a modest amount more per month, making it one of the most cost-effective financial protections available.
What to Remember
State minimums keep you legal, but they rarely cover the true cost of a serious accident. Match your liability limits to your net worth, add uninsured motorist and medical coverage, and consider an umbrella policy if you have assets to protect. Review your policy annually or after any major life change, such as buying a home, changing jobs, or adding a teenage driver. The goal is simple: make sure a single crash cannot derail your financial future.
