Why the same coverage costs $1,200 or $3,800
Auto insurance is one of the most price-discriminated products in America. Carriers use 50+ rating factors: age, gender (in most states), credit, ZIP code, marital status, education, occupation, prior carrier tenure, lapse in coverage, garaging address, vehicle VIN risk profile. Two identical drivers with different ZIP codes can pay 2× different premiums for the same coverage.
- • Credit-based insurance scoring drives 15–25% of premium variance in states that allow it (banned in CA, HI, MA, MI, WA).
- • Telematics / usage-based discounts now save 10–30% for good drivers in 40+ states.
- • Bundle home + auto with the same carrier saves 8–15% on average.
- • Raising deductible $500 → $1,000 cuts collision premium ~10%.
The 'state minimum' trap
State minimum liability ($25K/$50K BI in most states) is woefully inadequate for any real accident. Average car repair after collision is $4,200 and an ER visit is $3,800. One serious accident at state minimum and you're personally on the hook for $200K+ in damages. Stack 100/300/100 with an umbrella policy — the cost difference vs minimum is usually $200–400/yr and the protection is 10×+.
Related guides
Long-form playbooks on the same topic, written by the RevenueLab editorial team.
FAQ
How is car insurance calculated?
Insurers start from a state-specific base rate then apply multipliers for age, gender, credit, ZIP code, vehicle VIN, coverage level, mileage, incidents, and prior coverage tenure. The product of those multipliers × base = your premium. Different carriers weight factors differently — that's why shopping matters.
What is the average car insurance per month?
The 2026 NAIC US average is ~$148/month for full coverage and ~$58/month for liability-only. State averages range from $90/mo in Vermont to $250+/mo in Michigan and Florida.
Why is my car insurance so expensive?
The top 3 culprits in 2026 are (1) state — MI/FL/LA/NY structural cost, (2) age — anyone under 25, (3) credit-based insurance score. Other big movers: an at-fault accident or major ticket in the last 3 years, a vehicle with high repair cost or theft rate, or a coverage lapse in the last 12 months.
Does credit score affect car insurance?
Yes, in 46 states. Banned in California, Hawaii, Massachusetts, and Michigan. Going from 'poor' to 'excellent' credit typically cuts premium 15–25% — often a bigger lever than driving record.
How often should I shop car insurance?
Every 12–24 months and after any life event (move, marriage, new driver in household, new vehicle, paid-off vehicle). Carriers re-rate at renewal and a 12-month carrier rarely beats a new-customer quote. Compare apples-to-apples: same coverage limits and deductibles.
How this calculator is built
Independently maintained
Written by Sam Doshi and the RevenueLab editorial team. We don't sell the data feeds this tool is built on.
Sourced from primary data
Benchmarks come from public AdSense / Stripe / IRS disclosures and reader-submitted data — never third-party "$X per view" claims. Full methodology.
Last reviewed
June 2026. We re-check every figure on the platform on a rolling quarterly cycle.
Editorial standards
See our editorial policy and disclaimer. Results are estimates, not advice.