How much car insurance do you need? Read the page that says what you bought

Ask a driver what cover they have and a great many will say “full coverage” and stop there. No regulator defines that phrase. It is a habit of speech that usually means liability plus collision plus comprehensive — which is the combination a lender insists on — and it settles none of the questions that decide what a claim pays.

The document that settles them arrives with every renewal and is thrown away unread. Washington State’s Office of the Insurance Commissioner describes an auto policy as a contract in two parts, a declarations page and the policy itself, and says of the first that it is worth reviewing to confirm that every coverage you asked for is actually there. So this piece reads a declarations page in the order it prints, and asks of each line what it will do on the day of a crash.

The names at the top

The page opens with the insurer, the policy number, the policy period, and the people the policy covers. Texas’s insurance department tells readers to check the drivers’ names and to add new drivers and remove people who have moved out permanently. That instruction sounds administrative. It is the single most common way a policy quietly stops covering the person driving the car.

California’s department puts the sharp end of it directly: read the policy before you let other people drive your car, because some drivers may be excluded, and the policy will not cover an accident while an excluded driver is at the wheel. An exclusion is usually agreed deliberately — a household member with a record whose presence on the policy would have doubled the premium — and then forgotten by everyone except the insurer.

Underneath, the vehicles: year, make, model and vehicle identification number. Cars get sold and replaced faster than policies get amended.

Liability: the number the legislature chose for you

Liability is the part of the policy that exists for other people. Texas describes it as paying to repair the other driver’s car and paying the other driver’s and passengers’ medical bills when you caused the accident, and California splits it into bodily injury liability for injuries you cause and property damage liability for property you damage. Neither pays for you or for your own car. That is what the rest of the page is for.

Two things about the limit matter more than the limit itself.

The first is that it is a ceiling, not an estimate. California’s guide says the limit is the total the company will pay for a single accident or claim and that the company will not pay costs above it; Texas says the same and finishes the sentence properly — if you do not have enough coverage, you pay the difference yourself.

The second is that the legal minimum was never a recommendation. It is a political number, set once and revised rarely, and it is sized to make cars insurable rather than to make victims whole. The Texas department says so in its own guide, under a heading that tells readers to consider buying more: minimum limits might be too low if you cause a multi-vehicle accident or the other driver’s car is totalled, and the other driver could sue you. The minimum for your own jurisdiction is in the data at the end of this page. Read it as the floor beneath which you may not buy, then decide separately what you actually want above it.

Collision, comprehensive, and the deductible you agreed to

These two cover your own car, and they are the only coverages on the page with deductibles. California defines collision as damage from physical contact with another vehicle or an object, and comprehensive as damage from something other than a collision — fire, theft, vandalism, windstorm, flood, a falling object — and adds that comprehensive does not reach mechanical breakdown, normal wear or maintenance. Both pay on the market value of the car, which is the arithmetic that turns an older car into a write-off faster than its owner expects.

They are usually optional, and then they are not. Texas says a lender will require both while money is owed on the car, and describes what happens when they lapse: the lender buys single-interest coverage, adds the cost to the loan payment, and that coverage protects the lender and nobody else.

The deductible sits next to each one on the page. Texas frames the trade honestly — a higher deductible lowers the premium and costs you more out of pocket on the day you claim. It is a decision about your own cash position, and it should be made when you have time to think about it rather than in the week the car is in a workshop.

Uninsured and underinsured motorist: the coverage for the driver who has nothing

Texas describes this as paying when you are hit by someone who had no insurance or not enough to pay your medical and repair bills, and when you are the victim of a hit and run, and adds that insurers must offer it and that a refusal has to be in writing. California separates the bodily injury part, the property damage part, and a collision-deductible waiver that pays your deductible when an uninsured driver is at fault.

Whether it is compulsory, whether it must be offered, and what has to be signed to decline it vary, and the field is in the data block below. What does not vary is the shape of the problem it answers: a claim against a driver with no policy and no assets is a judgment nobody collects.

Medical cover, which is two different things wearing similar names

Texas draws the distinction better than most: medical payments coverage pays your and your passengers’ medical bills, and reaches you while you are riding in someone else’s car or walking or cycling; personal injury protection does the same and also pays lost wages and other non-medical costs. In some places one of them is on every policy unless you decline it in writing. Which of the two you hold changes what happens in the weeks after an injury, when the bills arrive before anyone has decided who was at fault.

The lines near the bottom

Gap cover is the clearest example of a coverage that exists because two industries measure the same car differently. Washington describes it as paying, on a total loss, the difference between the current market value of the car and what is still owed to the lender. Texas explains why the difference exists at all: the amount an insurer pays when it totals a car may be less than the loan balance. That gap is at its widest on a new car in its first year, which is exactly when owners assume they are best protected.

Rental reimbursement and towing sit near them, and both have quiet limits. Texas says the insurer pays for a rental only for the time it considers reasonable to repair or replace the car, at a set amount each day, up to the policy’s own limit. The days the workshop waits for a part are the days that argument is about.

What the page does not say

Every declarations page is a summary. The exclusions live in the policy body, and two of them matter before anything has happened.

Texas lists among the things most policies do not cover accidents that happen while driving for a ride-hailing service or delivering for a fee, and accidents in a car that does not belong to you but is regularly available to you, such as a company car. California confirms the mirror image: cover for business use, including driving for a transportation network company, is something you buy as an endorsement rather than something you have.

That second exclusion is where a personal policy and a company’s exposure meet.

For a company: the car you do not own is the one that is uninsured

A business that owns vehicles insures them. The gap opens around the vehicles it does not own. New York’s Department of Financial Services states the exposure without hedging: you may need non-owned automobile coverage if you or your employees use personal vehicles on company business, because the business can be sued over a crash even when the vehicle is not company owned, and the same cover may extend to rental cars on business travel.

The employee’s personal policy is not a substitute. It was written to protect the employee, it may exclude the business use outright, and it carries the limit the employee chose for their own reasons. California’s commercial guide describes the structure that replaces it — a business auto policy where each vehicle carries covered-auto symbols that say which cover applies to owned, hired and non-owned vehicles, and where the limit is commonly a combined single limit rather than the split limits a personal policy uses.

The practical readiness question for a company is not which policy it bought. It is whether anybody has written down which employees drive their own cars on company errands, how often, and with what limits — because that list is what an insurer will ask for, and it is always assembled after the crash instead of before it.

Outside the United States, the same floor with a different shape

The vocabulary changes and the structure does not. Spain’s consolidated motor liability law obliges the owner of every vehicle normally kept in Spain to hold and maintain insurance covering civil liability up to the limits of the compulsory cover, and fixes those limits by statute. What the law then says is the point of this whole article, stated by a legislature: where the compensation exceeds the compulsory cover, the compulsory insurance pays its maximum and the remainder falls to the voluntary insurance or to the person responsible for the accident.

The same law puts beyond the compulsory cover the injuries of the driver who caused the accident and damage to the insured vehicle itself and to property belonging to the policyholder, the insured, the owner or the driver. Those are precisely the losses that collision, comprehensive and medical cover exist to pick up.

What we cannot tell you

We cannot tell you what limits are right for you, because that depends on what you would lose in a judgment, and nobody has published a rule that turns a balance sheet into a coverage limit. We cannot tell you whether your policy carries the coverages described here; only your own declarations page can, and it is in a drawer or an email attachment somewhere. And we cannot tell you what an insurer will argue about a business-use exclusion on the day it matters, because that argument is decided on facts about your particular journey.

What is worth doing tonight takes ten minutes. Open the declarations page. Check the names against the people who actually drive the car, check the limits against what you would be exposed to if you caused a serious injury rather than a dented bumper, and check whether uninsured motorist cover is there at all. Then put it somewhere you can find it from a roadside, because the day you need it you will not be at your desk.