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Base Premium: The calculation starts with a base rate derived from your vehicle's market value. A typical base rate is around 2.5% of vehicle value per year for collision coverage.
Coverage Multiplier: Liability-only coverage applies a 0.4x multiplier (much lower cost), collision adds a 1.0x factor, and comprehensive (full coverage) uses a 1.35x multiplier to account for theft, weather, and non-collision damage.
Age Factor: Younger drivers (under 25) and older drivers (over 70) statistically have higher claim rates. A surcharge of 30-50% may apply. Drivers aged 30-60 generally receive the best rates (0.9x factor).
Mileage Factor: Higher annual mileage means more exposure to risk. The industry average is about 12,000 miles/year. Drivers under 7,500 miles/year receive a low-mileage discount, while those over 20,000 miles/year pay more.
Driving Record: A clean record yields no surcharge. Minor violations (speeding tickets) add roughly 15-25%, at-fault accidents or major violations add 40-60%, and multiple incidents can more than double your premium.
Final Formula: Annual Premium = Base Rate x Coverage Multiplier x Age Factor x Mileage Factor x Record Factor.