By Elena Petrova · Research Writer
Published · Updated
Answer in brief
Liability-only pays for what you do to others; full coverage adds collision and comprehensive for your own car. The cost gap is typically 40–60% of the premium. Whether full coverage is worth it is purely a question of the car's value against the cost of those two coverages: for a $25,000 car, almost always; for a $4,000 car, almost never; in between, the deciding factors are whether you could replace the car from savings and whether your area has high theft or weather risk.
What each includes
| Liability-only | Full coverage | |
|---|---|---|
| Injuries/damage to others | Yes | Yes |
| Your car — crash | No | Collision |
| Your car — theft, weather, vandalism, animals, glass | No | Comprehensive |
| Your injuries | Only if PIP/MedPay required or added | Same |
| Uninsured driver hits you | Only if UM carried | Same |
| Rental, roadside | No | Optional add-ons |
Worked example
| Car value | Liability-only (100/300/100 + UM) | Full coverage | Collision + comp cost | Verdict |
|---|---|---|---|---|
| $25,000 | $850 | $1,900 | $1,050 (4% of value) | Keep full coverage |
| $12,000 | $850 | $1,550 | $700 (6% of value) | Keep, or drop collision only |
| $6,000 | $850 | $1,350 | $500 (8% of value) | Borderline—depends on savings |
| $3,500 | $850 | $1,250 | $400 (11% of value) | Liability-only (consider comp alone) |
The hidden variable: deductible
On a $3,500 car with a $1,000 deductible, a total loss pays $2,500. You are paying $400 a year for a maximum benefit of $2,500—and most claims are smaller. The arithmetic turns against collision quickly as value falls.
Questions & answers
Is full coverage worth it on an old car?
Usually not once collision and comprehensive cost 10% or more of the car's value per year.
Does full coverage cover everything?
No. It is liability plus collision and comprehensive. Rental, roadside, gap and UM are separate.
Can I have comprehensive without collision?
Yes, and it is often the best middle option for a mid-value car.
Terms used in this guide
- Full coverage
- Informal term for liability plus collision and comprehensive.
- Collision coverage
- Pays to repair or replace your own car after a crash, minus the deductible. Not included in a liability-only policy.
- Comprehensive coverage
- Pays for non-crash damage to your car—theft, weather, flood, fire, vandalism, animals, glass. Can be carried without collision.
- Actual cash value (ACV)
- What your car was worth just before a loss—replacement cost minus depreciation. The basis for deciding whether collision is worth keeping.
Sources and references
Legal figures on this page (minimum limits, filing periods, statutory benefits) are checked against the primary law or the state insurance regulator listed below. Links and figures last verified Nov 2026.
- Automobile financial responsibility limits by state — Insurance Information Institute (2023)Statistical dataCompulsory coverages and minimum liability limits by state (table dated December 2023 — several states have raised limits since; see statute entries).
- Insurance losses by make and model — Highway Loss Data InstituteStatistical dataRelative claim frequency and severity by vehicle under collision, property damage, comprehensive, PIP, MedPay and bodily injury coverages.
- What is covered by a basic auto insurance policy? — Insurance Information InstituteConsumer guidanceDefines bodily injury and property damage liability, MedPay, PIP, uninsured/underinsured motorist, collision, comprehensive and glass coverage.
- How much auto coverage do I need? — Insurance Information InstituteConsumer guidanceWhy state minimums are a floor; choosing liability limits that protect assets; when collision and comprehensive are worth keeping.
- Nine ways to lower your auto insurance costs — Insurance Information InstituteConsumer guidanceShop at least three quotes; raising a deductible from $200 to $500 can cut collision/comprehensive cost 15–30%, $1,000 can save 40%+; drop physical damage on cars worth under 10× the premium; bundling, low-mileage and good-student discounts.
- Is it legal to drive without insurance? — Insurance Information InstituteConsumer guidanceEvery state requires drivers to demonstrate financial responsibility; in most states insurance is the mandatory way to do so.
- Understanding your insurance deductibles — Insurance Information InstituteConsumer guidanceHow deductibles apply to collision and comprehensive and how raising them lowers premium.
- What is gap insurance? — Insurance Information InstituteConsumer guidanceGap coverage pays the difference between a car's actual cash value and the loan or lease balance after a total loss.
Practical guidance on this page is original editorial work. Cited sources support factual statements and do not endorse this site. Dollar ranges described as typical or illustrative are editorial estimates, not figures from these sources.
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