Stop Overpaying for Car Insurance: Full Coverage vs Liability Only

Are you still paying for “Full Coverage” on a car that’s barely worth $5,000? You might be throwing money away. While “Liability” insurance is legally required, “Collision” and “Comprehensive” are optional once your car is paid off. Knowing when to drop them is the single biggest way to lower your bill. Here is the simple “10% Rule” to decide.

BMT Consumer Advocates BMT Consumer Advocates · 📅 Mar 2026 · ⏱️ 5 min read · INSURANCE › AUTO
Rule
10%
Cost vs Car ValueCheck
Action
Drop
Collision on Older CarsSave
Potential
$500+
Annual SavingsWin
A balance scale showing the high cost of full coverage insurance ($800/yr) outweighing the low value of an older car ($5,000).

The 10% Rule Visualized: This scale shows why paying $800/year for full coverage on an older car worth only $5,000 makes little financial sense. The cost outweighs the potential benefit.

Image Source: bestmoneytip.com

1. The Three Main Parts of Your Policy

Before you cut anything, you need to know what it does.

✅ Liability (Keep This)
Pays for injuries and property damage to OTHERS when you are at fault.
  • Required by law? Yes (in most states).
  • Recommendation: Get high limits (e.g., 100/300/100) to protect your assets from lawsuits.
❌ Full Coverage (Optional)
Pays for damage to YOUR CAR regardless of fault.
  • Collision: Hitting another car or object.
  • Comprehensive: Theft, vandalism, hail, deer.
  • Recommendation: Drop it on older cars.

2. The “10% Rule”: When to Drop Full Coverage

This is the most important calculation for saving money. It helps you decide if the insurance cost is worth the potential payout.

The 10% Rule of Thumb:
Take the annual cost of your Comprehensive and Collision coverage. Divide it by your car’s current market value (check KBB or Edmunds).
If the result is more than 10%, consider dropping full coverage.
EXAMPLE SCENARIO: 10-Year-Old Sedan
Car’s Market Value: $5,000
Deductible: $1,000
Max Payout from Insurance: $4,000 ($5k value – $1k deductible)
Annual Cost of Full Coverage: $800 / year
The math: $800 is 16% of the car’s $5,000 value.
Verdict: Drop Full Coverage. You are paying too much for too little protection.

3. Three More Quick Ways to Save

Raise Your Deductible: Going from a $500 to a $1,000 deductible can lower your premiums by 15-30%. Just make sure you have $1,000 in an emergency fund.
Bundle Policies: Buying auto and home/renters insurance from the same company almost always gets you a discount.
Shop Around: Loyalty doesn’t pay. Get new quotes every 1-2 years. Prices change based on algorithms, not your loyalty.

4. Frequently Asked Questions

What if I still have a car loan?
If you are financing or leasing your car, the lender almost always requires you to carry full coverage. You cannot drop it until the loan is paid off.
Should I drop Uninsured Motorist coverage?
No. This is relatively cheap and protects you physically if you are hit by a driver with no insurance (which is surprisingly common). Keep it.