The choice between liability-only and full coverage is the single biggest premium decision you'll make. Get it wrong, and you're either overpaying for protection you don't need — or one accident away from a financial disaster.
Here's how to figure out which one is right for you, without the upsell.
What Each Coverage Actually Means
Liability-only insurance
Pays for damage and injuries you cause to other people. It's required by law in nearly every state (New Hampshire is the lone exception). It does not pay for:
- Damage to your own vehicle
- Theft of your vehicle
- Damage from weather, vandalism, or hitting an animal
- Your medical bills (in most states)
Full coverage
The industry term for liability + comprehensive + collision. The added pieces:
- Collision — Pays to repair or replace your car after an accident, regardless of fault.
- Comprehensive — Covers everything that isn't a collision: theft, fire, hail, falling branches, hitting a deer.
Full coverage typically costs 2-3× more than liability-only.
When Full Coverage Is Required
You don't always get to choose. Full coverage is mandatory if:
- You financed your car. Your lender owns a stake in the vehicle and requires you to insure their collateral.
- You leased your car. Same logic — the leasing company protects its asset.
If your car is paid off, the decision is yours.
The Practical Decision Rule
The math is simpler than most people make it. Drop full coverage when your annual premium for it exceeds 10% of your car's actual cash value.
Example 1: Old paid-off Civic
- Car value: $4,000
- Full coverage premium: $1,200/year
- Liability-only premium: $500/year
- Cost of full coverage: $700/year
- 10% of car value: $400
$700 > $400 → Drop full coverage. You'd pay more in premiums over 6 years than the car is worth.
Example 2: 3-year-old paid-off SUV
- Car value: $22,000
- Full coverage premium: $1,800/year
- Liability-only premium: $700/year
- Cost of full coverage: $1,100/year
- 10% of car value: $2,200
$1,100 < $2,200 → Keep full coverage. The protection is worth the cost relative to what you'd lose.
When You Definitely Need Full Coverage
Beyond the 10% rule, keep full coverage if any of these apply:
- You couldn't afford to replace your car out of pocket. Even a $5,000 hit is a problem for many households.
- You drive in high-risk areas. Dense cities, areas with frequent severe weather, regions with high theft rates.
- Your car is your primary income tool. Rideshare drivers, delivery drivers, mobile contractors.
- You're prone to optimism bias. If "it won't happen to me" is your default, the small premium savings isn't worth your peace of mind.
When Liability-Only Makes Sense
- Your car is paid off, worth under $5,000, and you have savings to replace it.
- You drive infrequently (under 5,000 miles per year).
- You have a clean driving record and live in a low-risk area.
- You park in a secure garage and rarely leave the car on the street.
Three Common Mistakes
Mistake #1: Dropping liability limits to save money
Liability is the coverage that protects your assets from a lawsuit. State minimums are often pitifully low — $25,000 per person in bodily injury liability in most states, when a hospital stay alone can easily exceed that.
If you have meaningful assets (home equity, retirement savings, future earnings), carry at least $100,000 / $300,000 / $100,000 in liability limits. The added premium is small. The downside protection is enormous.
Mistake #2: Keeping full coverage on a 15-year-old car
A common pattern: you got full coverage when the car was new, and just never canceled it. After a decade, you're paying $1,500/year to insure a $2,800 vehicle. The math no longer works.
Check your car's current value (KBB, Edmunds, NADA) every couple of years and rerun the decision.
Mistake #3: Choosing a deductible you can't actually afford
A $2,000 deductible saves on premium, but if you don't actually have $2,000 in the bank, you can't fix your car after a claim. Pick the highest deductible you could realistically cover from savings.
The Sweet Spot for Most Drivers
For drivers with paid-off cars worth $8,000-$25,000, the best balance is usually:
- Full coverage with a $1,000 deductible
- $100/$300/$100 liability limits
- Uninsured motorist coverage matching liability
- Medical payments coverage of $5,000-$10,000
This combination protects you against the catastrophic outcomes — major injury liability, vehicle replacement after a serious accident, getting hit by an uninsured driver — without paying for marginal extras.
Bottom Line
Liability-only is fine if your car is old and you can self-insure the replacement. Full coverage is necessary if you can't easily replace your car — and required if you have a loan or lease.
The smart move isn't picking the cheaper option. It's picking the option that matches the actual financial risk you're carrying.
Compare both side-by-side on Quorrio — we'll show you the premium difference for each coverage level in under five minutes.