Liability vs. full coverage: a simpler decision than it looks

Insurance jargon makes this decision sound complicated. It mostly isn't. Strip away the terminology and you're answering one question: is your car worth paying to protect?

The two coverages, in one breath each

• Liability (required in California, minimum 30/60/15): pays for injuries and damage you cause to others. Never touches your own car.
• Full coverage (liability + comprehensive + collision): adds protection for your own car — collisions you cause, theft, vandalism, fire, falling branches, the mysteries of parking lots.

The shortcut that settles most cases

Compare your car's current market value against what comprehensive + collision cost you per year, plus your deductible. As the car's value falls, there's a crossover point where the coverage can no longer pay out enough to justify its price. A $3,500 car with a $500 deductible is often at — or past — that point: compare what a year of comp/collision costs you against the most the car could ever pay out, and the math speaks for itself. A $28,000 SUV is nowhere near it.

Readers who want the paperwork side can follow the guide to liability vs full coverage, which lists what the DMV and the carrier each need.

What people get wrong in both directions

• Over-insuring the car, under-insuring themselves. Drivers with real savings or a home keep state-minimum liability to save money while paying to protect a $6,000 car. Backwards: one serious at-fault accident threatens your assets far more than your car's value. Raising liability limits is usually cheap; a lawsuit isn't.
• Dropping everything on a car they can't replace. Liability-only "saves money" until the car dies in an accident and there's no budget to replace it. If losing the car would be a crisis, that's an argument for keeping collision even on a modest vehicle.

The California extra: uninsured motorist

A meaningful share of California drivers carry no insurance at all. Uninsured/underinsured motorist coverage protects you and your passengers when one of them hits you. It's inexpensive, and most agents rank it among the highest-value coverages on the menu — whichever side of the liability/full-coverage line you land on.

The answer changes over time, so re-ask it

This is not a decision you make once. The car's value falls every year while the cost of covering it does not fall at the same pace, so a choice that was obviously right when the car was new drifts toward being marginal without anyone noticing.

Two moments are worth a deliberate re-check. The first is the month you pay the loan off, because the lender's requirement disappears and the decision becomes genuinely yours for the first time. The second is any renewal where the car has crossed into being easily replaceable out of savings.

The arithmetic is the same each time: what does the comprehensive and collision portion cost you for the year, and what is the most it could ever pay out, given the car's value and your deductible? When those two numbers get close, the coverage has stopped being insurance and started being a savings account with a middleman.

We will quote it both ways on the same screen so you can see the actual difference for your car rather than reasoning about it in the abstract.