The Decision Rule
If your annual full-coverage premium exceeds 10% of your car's current market value, consider dropping collision and comprehensive.
This rule is a financial efficiency heuristic. Over many policy periods, paying premiums above 10% of asset value means you are paying more than the expected value of your potential claims. The car is simply too cheap relative to the cost of insuring it for physical damage.
Drop Example
2016 Honda Civic
| Car value | $6,000 |
| Full coverage/yr | $1,100 |
| Ratio | 18.3% |
| Decision | DROP |
Keep Example
2023 Toyota RAV4
| Car value | $28,000 |
| Full coverage/yr | $1,600 |
| Ratio | 5.7% |
| Decision | KEEP |
Your Numbers
Check the 10% Rule for Your Car
The Rule Only Works When These Preconditions Are Met
- Car is fully paid off. If a lender is on your title, they require full coverage regardless of the 10% math. Dropping it triggers force-placed insurance at 2-3x cost and can put the loan in default.
- You can replace the car from savings. Self-insuring on physical damage means writing a check for $8,000-$12,000 if you total the car. If that would devastate your emergency fund, the 10% rule does not apply yet.
- You are NOT also dropping liability or UM. The 10% rule only governs collision and comprehensive -- the physical damage coverages. Your liability limits and UM/UIM coverage are completely separate decisions and should not be reduced.
- You are not in a high-theft or high-natural-disaster area. If your ZIP code has vehicle theft rates significantly above average, or you are in a hurricane or hail belt, the expected value of comprehensive claims may exceed 10% even on a cheap car.
10-Year Projection
Depreciation + Premium Curve: $30,000 Honda Accord (2026 Purchase)
Full-coverage premiums drop slowly as cars age (roughly 4-6% per year) while car values drop fast (roughly 15-20% in year 1, 10-15% per year after). The ratio -- premium as a percentage of value -- steadily rises. For this $30,000 car, the 10% threshold fires at year 3.
| Year | Car Value | Full Coverage/yr | Liability/yr | Premium Ratio | Verdict |
|---|---|---|---|---|---|
| Yr 0 | $30,000 | $1,900 | $950 | 6.3% | keep |
| Yr 1 | $23,700 | $1,820 | $920 | 7.7% | keep |
| Yr 2 | $19,400 | $1,740 | $890 | 9% | borderline |
| Yr 3 | $16,100 | $1,680 | $870 | 10.4% | drop |
| Yr 4 | $13,500 | $1,620 | $850 | 12% | drop |
| Yr 5 | $11,500 | $1,570 | $830 | 13.7% | drop |
| Yr 6 | $9,900 | $1,520 | $810 | 15.4% | drop |
| Yr 7 | $8,600 | $1,480 | $790 | 17.2% | drop |
| Yr 8 | $7,500 | $1,440 | $770 | 19.2% | drop |
| Yr 9 | $6,600 | $1,410 | $755 | 21.4% | drop |
| Yr 10 | $5,800 | $1,380 | $740 | 23.8% | drop |
Based on mid-size sedan depreciation curves (Kelley Blue Book/NADA 2026) and national average premium trajectories (MoneyGeek/Bankrate April 2026). Actual values vary by vehicle, ZIP code, and carrier.
When the 10% Rule Is Wrong
- Classic and collector cars. ACV is meaningless for vehicles whose value appreciates or is set by agreed-value policies. A 1969 Mustang with agreed value of $45,000 should not be evaluated with the 10% rule.
- High-theft-rate ZIP codes. If comprehensive claims are highly probable, the expected value of that coverage exceeds what the rule assumes. Check your carrier's data or the NICB hotspot list.
- Drivers with very poor records. If your collision expected value is elevated due to driving history, the rule's assumptions break down.
- No emergency fund. The rule implies you can self-insure. Without 3-6 months of savings, losing the car to a total loss is a financial emergency. The rule should be applied only when you genuinely can cover the loss.
What to Do Instead of Dropping Full Coverage
If the 10% rule fires but you are not comfortable fully dropping physical damage coverage, consider these intermediate steps:
- Raise your deductible from $500 to $1,000. Saves 15-30% on the physical damage portion. On a $400/yr physical damage premium, that is $60-120/yr saved while retaining full coverage protection.
- Shop annually. Rates can vary 30-40% across carriers for the same driver and car. A quick comparison at renewal could match what dropping would save.
- Bundle home and auto. Multi-policy discounts average 5-25%. If you have renters or homeowners insurance elsewhere, moving it to the same carrier can significantly offset full-coverage costs.
- Telematics discounts. Programs like Progressive's Snapshot or Allstate's Drivewise monitor driving behavior and offer 10-30% discounts for safe drivers. If you drive below 10,000 miles/year, these programs consistently benefit you.
- Drop collision but keep comprehensive. If theft and weather are your main concerns but collision risk is low, keeping only comprehensive at $150-300/yr may be the right compromise. See our full coverage breakdown for what each covers.
If you are repairing an older car and wondering whether a costly fix is worth it given the car's value -- a common trigger for this research -- see ignitioncoilreplacementcost.com for what typical repairs cost. The buy-vs-replace-vs-repair decision and the coverage decision often need to be made together. If a new purchase is on the horizon, see awdvs4wd.com for how drivetrain choice affects insurance and total cost of ownership.
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