Your premium isn't a guess — it's a formula. Here's what insurers actually weigh, and which factors you can influence.
Two drivers with the same car, the same coverage level, and the same zip code can still end up with premiums that differ by hundreds of dollars a year. That's not random — insurers run every applicant through a pricing model built on a mix of statistical risk factors, and small differences in any one of them can move the final number meaningfully.
Understanding what actually goes into that formula won't make your insurer hand you their algorithm, but it does explain why your quote looks the way it does, and which levers are actually worth pulling if you want it to change.
Nothing in the formula matters more than how you've actually driven. At-fault accidents, speeding tickets, and especially DUIs tend to raise premiums more than almost any other factor, and the effect compounds — multiple incidents in a short window can push you into a much higher risk tier, not just a slightly higher one. The flip side is that a clean record for three to five years is usually the single biggest discount available, often without you having to ask for it.
Insurers price by zip code because location correlates strongly with claim frequency and severity — dense urban areas tend to see more accidents and theft, while areas prone to hail, flooding, or wildfire see more comprehensive claims. Two people with identical driving histories can get noticeably different quotes purely based on where the car spends its nights.
Location-based pricing is built on aggregate claims data for an area, not anything specific to your address. It's the same logic that makes flood insurance more expensive near a floodplain — the individual policyholder didn't cause the risk, but they're priced as part of the group that shares it.
Make, model, age, and trim level all factor in, mostly through three lenses: how much the car costs to repair, how often that model is stolen, and how it performs in safety testing. A car with expensive, hard-to-source parts will usually cost more to insure for comprehensive and collision coverage than a similarly priced car with cheaper, more available parts — even if both are equally safe to drive.
In most states, insurers are permitted to use a credit-based insurance score as one input — a different calculation from your standard credit score, but built from similar underlying data. Statistically, this score has been shown to correlate with claim likelihood, which is why insurers use it, even though it can feel disconnected from actual driving behavior. A handful of states ban or restrict this practice, so its impact on your specific quote depends partly on where you live.
Newer drivers, statistically, file more claims per mile driven than experienced ones, which is why teenage and young-adult drivers see some of the highest premiums in the market. This isn't really about age as a number — it's a proxy for years of driving experience and the maturity of judgment that tends to come with it. Premiums typically decline gradually through someone's twenties as their personal claims history builds and the actuarial risk curve for their age group drops.
The formula isn't judging you — it's pricing the statistical group you fall into, based on factors that correlate with claims across thousands of similar drivers.
Everything above determines your baseline risk price, but the coverage you choose to buy on top of that baseline moves the number too. Higher liability limits, lower deductibles, and add-ons like rental reimbursement or roadside assistance all increase the premium in fairly predictable, linear ways — these are the parts of the equation you control directly, every time you renew or shop a new policy.
Some inputs, like your age or the area you live in, aren't really things you can change for the sake of a lower premium. But several genuinely are within your control:
None of these guarantee a dramatically lower number on their own, but together they tend to move the needle more than people expect — and they're also the only parts of the formula you actually have a say in.
It's worth knowing that insurers periodically recalibrate their entire pricing model based on updated claims data across their whole book of business, not just your individual file. That means your premium can shift at renewal even if your driving record, vehicle, and address haven't changed at all — the underlying formula itself moved, often in response to broader trends like rising repair costs or increased claim frequency across the industry. This is one more reason shopping your policy periodically is worth doing: a rate increase tied to industry-wide repricing at one insurer doesn't necessarily show up the same way at another.