Your car insurance rate is built from a rating plan your insurer files with your state’s insurance department — a formula that weighs who you are, where you drive, what you drive, and how much coverage you buy. About a dozen factors do nearly all the work. Some you can’t change; several you can, and knowing which is which is the difference between shrugging at a renewal and actually lowering it.
Factors about you
1. Age and driving experience. The single most visible rating factor. Experian’s 2026 marketplace data shows drivers under 20 averaging $3,224–$3,414 per year, drivers in their 20s about $2,730–$2,816, and drivers in their 40s roughly $2,172–$2,263. Rates typically decline as experience accumulates, then rise again for the oldest drivers. Young drivers pay more because crash rates per mile are highest for the least experienced — our young driver guide covers the workarounds.
2. Driving record. Accidents and violations are priced directly into the premium. In Experian’s 2026 data, a clean record averaged about $2,112/year; one moving violation lifted that to roughly $2,515, and three or more violations to about $2,893. Insurers typically look back three to five years, so a single ticket has a long tail.
3. Credit-based insurance score. In most states, insurers may use a credit-based insurance score — a model built for insurance, not lending — as a rating factor. The NAIC confirms this is legal in most states and advises checking your state’s rules and reviewing your credit reports for errors before getting quotes. A few states ban or restrict the practice. Where it’s used, drivers with poor scores can pay substantially more than otherwise identical drivers with strong scores. Details in credit and car insurance.
4. Gender. Where allowed, gender is a rating factor because crash statistics differ — young men are involved in more severe crashes, so they generally pay more than young women. Several states (including California, Hawaii, Massachusetts, Michigan, Montana, North Carolina, and Pennsylvania) prohibit or restrict using gender in auto rating, so this factor’s impact depends on where you live.
5. Marital status. Married drivers statistically file fewer claims, so most insurers offer a married discount. It’s a small factor, but it’s automatic once your status changes — as long as you tell your insurer.
6. Insurance history. Continuous coverage with no lapses signals reliability; a gap in coverage — even a month between policies — can raise your rate. Drivers coming off an SR-22 filing face the steepest version of this: SR-22 insurance explains the high-risk filing and how to get past it.
Factors about where and how you drive
7. Location, down to the ZIP code. State regulation, crash density, theft rates, weather exposure, medical costs, and even local body-shop labor rates all feed the premium. Experian’s 2026 state table shows full coverage averaging $1,523/year in New Hampshire versus $4,181 in Maryland — the same driver, nearly triple the price. Urban ZIP codes generally cost more than rural ones.
8. Annual mileage and vehicle use. The more you drive, the more exposure you create. Low-mileage drivers can qualify for discounts, and commuting use is typically rated higher than pleasure use. If your driving dropped — remote work, retirement — tell your insurer; it’s one of the easiest legitimate reductions. Usage-based insurance takes this further by pricing actual driving behavior.
9. State insurance system. Whether your state uses a tort or no-fault system, what minimum coverages it mandates, and how it regulates rates all shape the baseline everyone pays. You can’t change your state’s system, but understanding it explains why your cousin across the border pays half.
Factors about your car
10. Make, model, and year. Insurers track repair costs, theft frequency, and claim severity by vehicle. Cars that are expensive to fix, easy to steal, or involved in costly crashes cost more to insure. The NAIC advises checking insurance costs before buying — advanced driver-assistance sensors, for instance, can make even minor fender repairs surprisingly expensive.
11. Safety and anti-theft features. Airbags, anti-lock brakes, electronic stability control, and anti-theft devices can earn discounts — the NAIC lists them among the standard discounts to ask about. Safety feature discounts break down which equipment actually moves the rate.
Factors about your policy choices
12. Coverage levels and deductibles. This is the factor entirely in your hands. Higher liability limits and lower deductibles cost more; minimum liability with high deductibles costs less. Full coverage averages about $2,922/year nationally versus $1,580 for liability-only (Experian, August 2026) — see the 2026 cost guide and the full coverage vs. liability framework for the trade-offs.
What you can actually change
| Factor | Can you change it? | How |
|---|---|---|
| Driving record | Yes, over time | Drive clean; violations age off in 3–5 years |
| Credit-based score | Yes, over time | Pay on time, lower balances (where used) |
| Mileage / use | Yes | Report lower mileage; consider telematics |
| Vehicle | Yes, at purchase | Choose safe, common, modest models |
| Coverage levels | Yes, anytime | Raise deductibles; right-size limits |
| Discounts claimed | Yes, today | Annual discount audit call |
| Carrier | Yes, anytime | Re-shop quotes yearly |
| Age | No (but time helps) | Every birthday helps through your 20s |
| Location | Rarely | Moving changes rates — re-shop after a move |
| State system | No | Understand it; don’t fight it |
| Gender | No | Banned as a factor in several states |
| Insurance history | Partially | Avoid lapses going forward |
How insurers combine the factors
Insurers don’t just add the factors up — they run them through a filed rating plan that sorts drivers into tiers. Here’s the simplified version of what happens when you apply:
- Base rate by territory. Your ZIP code sets the starting point, reflecting local crash, theft, weather, and repair-cost data.
- Driver classification. Age, gender (where allowed), marital status, and driving record move you up or down from the base.
- Vehicle factor. Your car’s symbol — set from its repair costs, theft rate, and claim history — multiplies the physical-damage portions.
- Coverage selections. Your limits and deductibles scale the final number.
- Discounts and surcharges. Everything from bundling to telematics scores applies last.
Each insurer’s plan is proprietary and filed with state regulators, which is why identical inputs produce different prices at different companies — one carrier may weight credit heavily while another barely uses it. This is also why re-shopping quotes works: you’re not just hunting discounts, you’re hunting the carrier whose formula favors your particular profile.
One more subtlety: insurers also use insurance scores — proprietary models combining credit-based data with insurance history (prior claims, lapses). Two drivers with identical credit scores can get different insurance scores if one has a lapse and a claim. Continuous coverage with the same carrier quietly builds this score in the background.
Factors drivers overrate — and underrate
Overrated: loyalty. Staying with one insurer for a decade feels virtuous, but longevity discounts are usually small and shrink against the “price optimization” some carriers apply at renewal — gradually raising existing customers’ rates because they’re unlikely to leave. Loyalty untested by shopping is just inertia.
Overrated: the car color myth. Red cars do not cost more to insure. Insurers rate make, model, year, trim, and safety equipment — never paint color. (They don’t even ask.)
Underrated: the garaging ZIP code. Moving a few miles can change your rate more than a birthday does. Always update your address — and if you’re choosing between two apartments, a quick quote for each ZIP is legitimate due diligence.
Underrated: prior insurance history. A six-month lapse between policies can raise your next premium noticeably, because insurers read lapses as risk. If you’re between cars, a named non-owner policy keeps continuity alive cheaply.
Underrated: annual mileage accuracy. Most drivers estimate mileage once and never update it. If remote work cut your commute, reporting the real number can unlock low-mileage pricing immediately.
- About 12 factors set your rate: you, your location, your car, and your policy choices.
- Age, record, location, vehicle, and coverage level do most of the work.
- Clean records, higher deductibles, and annual re-shopping are the levers you control today.
- Credit-based scores matter in most states; a few ban them.
- A coverage lapse can raise your rate — never let a policy gap open.
FAQ
Why is my car insurance so high with a clean record?
Location, vehicle, age, coverage level, and credit-based score can all push premiums up even with no tickets. A high-theft ZIP code or an expensive-to-repair car can matter more than your driving.
Do insurance companies check your credit for car insurance?
In most states, yes — insurers may use a credit-based insurance score (distinct from your lending credit score) as a rating factor. A few states prohibit or restrict it. The NAIC advises reviewing your credit reports for errors before getting quotes.
How long does an accident affect my insurance rate?
Typically three to five years, depending on the insurer and state. At-fault accidents carry heavier surcharges than not-at-fault claims, though even the latter can nudge some carriers’ rates.
Will moving to a new ZIP code change my rate?
Almost certainly. Rates are calculated at the ZIP-code level using local crash, theft, weather, and repair-cost data. Always notify your insurer of a move — and re-shop, since carriers price the new area differently.
Does the color of my car affect insurance?
No. This is one of the most persistent myths in insurance. Carriers rate the make, model, year, body style, engine, and safety equipment — paint color is never a rating factor and isn’t even collected on applications.
Will a not-at-fault accident raise my rates?
It depends on the insurer and state. At-fault accidents carry the heaviest surcharges, but some carriers also nudge rates after not-at-fault claims — particularly if there’s a pattern. A single not-at-fault fender-bender with most major carriers has little or no effect.
How often do insurers re-check my driving record and credit?
Typically at each renewal (every six or twelve months), when they pull fresh motor vehicle and claims reports. That’s why a violation’s surcharge appears at renewal rather than immediately — and why re-shopping right after a violation ages off can pay.
This is general information, not financial advice — check your state’s insurance department for rules that apply to you.