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A $4,000 car at $600/year needs to be totaled every 5.8 years to break even — real drivers total one every 25.
Every renewal, the same quiet question: why am I paying $600 a year to insure a car worth $4,000? The math has a clean answer. The insurer will never pay more than actual cash value minus your deductible — $3,500 on that car — so the premium breaks even only if you total the car every 5.8 years, against a real-world total-loss frequency of about once per 25. The 10% rule catches it faster: premium over 10% of the car's value means drop. But two gates come first — a loan or lease makes full coverage mandatory, and your emergency fund must be able to replace the car tomorrow. This calculator runs the rule, the breakeven, and both gates.
Owners of aging cars use it at renewal: premium as % of actual cash value plus the breakeven total-loss frequency shows a $4k car at $600/yr needs totaling every 5.8 years to break even — against a real frequency of once in 25.
Coverage for YOUR car's damage: collision pays when you hit something (or someone hits you and flees/is uninsured), comprehensive pays for theft, hail, flood, fire, vandalism, falling trees, and animal strikes. Everything else on your policy survives: liability (damage you cause others — never drop this), uninsured motorist, medical payments, and roadside. The sophisticated middle move: drop collision but keep comprehensive. Comprehensive is roughly a third of the combined premium because weather/theft claims are rarer than crashes, and those risks don't diminish as the car ages the way the at-fault-crash logic suggests — a $4,000 car is just as stealable and hail-dentable as a $40,000 one. Many carriers let you split them; ask.
Over the line — $900 is 11.3% of value, and the breakeven total-loss frequency ($900 against a $7,500 max payout at a $500 deductible) is 12%/year, three times the real-world rate. But the rule bends for two situations. First, the replacement gate: if $8,000 appearing tomorrow would hurt — or the car is essential to your income — the premium is buying liquidity, not just EV, and keeping it can be right. Second, your risk profile: park on the street in a hail zone, commute at deer o'clock on rural highways, or have a new driver on the policy, and your personal loss frequency isn't the fleet average. The rule is a screen, not a law — run the breakeven against YOUR roads and YOUR savings.
Not the way people fear — dropping comp/collision is a coverage change, not a lapse, and it doesn't mark your record. What DOES hurt: a full lapse in insurance (even a few days between policies flags you as higher-risk at the next quote — always overlap start/end dates), and claims themselves (an at-fault claim surcharges you 20–40% for 3–5 years, which is why filing a $1,200 claim on a $500 deductible is often a net loss). One renewal-season habit worth more than the drop decision: re-quote the whole policy every 1–2 years. Insurers price-optimize loyal customers upward; the same coverage often runs 15–30% cheaper at a competitor, and dropping comp/collision on an old car while raising liability to 100/300 frequently nets out to zero — better protection where it matters for the same money.