The Core Insight Most Sites Miss
Full-coverage premiums do not drop much with car age. The liability portion -- which covers your risk, not the car's value -- stays roughly flat throughout the car's life. The physical damage portion (collision + comprehensive) drops only 5-8% per year. Meanwhile, car values decline 15-20% in year 1 and 10-15% annually after that.
The result: the premium-to-value ratio relentlessly increases over time. A car that was a "keep full coverage" decision at purchase will typically cross the 10% threshold between years 3 and 8, depending on the vehicle and your premium level. The table below shows the full curve for a mid-size car purchased new at $30,000.
15-Year Premium and Value Table (Mid-Size Sedan)
| Car Age | Approx Value | Full Coverage/yr | Liability/yr | Savings/yr | 10% Ratio | Verdict |
|---|---|---|---|---|---|---|
| Yr 0 | $30,000 | $1,900 | $960 | $940 | 6.3% | keep |
| Yr 1 | $24,000 | $1,820 | $930 | $890 | 7.6% | keep |
| Yr 2 | $19,500 | $1,745 | $900 | $845 | 8.9% | borderline |
| Yr 3 | $16,200 | $1,675 | $875 | $800 | 10.3% | drop |
| Yr 4 | $13,800 | $1,615 | $855 | $760 | 11.7% | drop |
| Yr 5 | $11,900 | $1,560 | $835 | $725 | 13.1% | drop |
| Yr 6 | $10,300 | $1,510 | $815 | $695 | 14.7% | drop |
| Yr 7 | $9,000 | $1,465 | $800 | $665 | 16.3% | drop |
| Yr 8 | $7,900 | $1,425 | $785 | $640 | 18% | drop |
| Yr 9 | $7,000 | $1,390 | $770 | $620 | 19.9% | drop |
| Yr 10 | $6,200 | $1,355 | $755 | $600 | 21.9% | drop |
| Yr 12 | $4,800 | $1,295 | $730 | $565 | 27% | drop |
| Yr 15 | $3,400 | $1,225 | $705 | $520 | 36% | drop |
Mid-size sedan ($30k new). Premiums based on national averages (MoneyGeek/Bankrate April 2026). Values based on KBB/NADA depreciation curves. Individual results vary by carrier, ZIP, driver record, and vehicle.
Worked Examples: Three Vehicles
2015 Honda Civic (2026: 11 years old)
| Value | $5,500-$7,000 |
| Full coverage | $1,250-$1,500/yr |
| Liability only | $650-$800/yr |
| 10% ratio | 18-27% |
Classic 10% rule fire. Premium exceeds threshold by wide margin. Drop collision and comprehensive, keep 100/300/100 liability + UM/UIM.
2018 Toyota RAV4 (2026: 8 years old)
| Value | $16,000-$20,000 |
| Full coverage | $1,450-$1,700/yr |
| Liability only | $750-$900/yr |
| 10% ratio | 7-10% |
Right at the borderline. Worth checking annually. If you can get quotes below 10% of car value, keep it. Otherwise, consider dropping.
2020 Ford F-150 (2026: 6 years old)
| Value | $28,000-$34,000 |
| Full coverage | $1,700-$2,100/yr |
| Liability only | $850-$1,050/yr |
| 10% ratio | 5-7% |
Well below threshold. Full coverage is mathematically justified. F-150s also carry higher theft risk, which elevates comprehensive EV.
The Gotcha: Liability-Only Is Not 50% of Full Coverage Cost
Many drivers assume switching to liability-only cuts their bill in half. In reality, the physical damage portion (collision + comprehensive) is typically 40-50% of total premium. The liability portion stays because you still need it -- it covers your legal exposure, not your car.
Example: $1,500/yr full coverage policy breaks down as approximately $750-900/yr liability, $400-500/yr collision, $150-200/yr comprehensive. Moving to liability-only saves the $550-700/yr physical damage portion -- roughly 37-47% of the total bill.
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