What Factors Into a Car Insurance Rate?

Obviously, your driving record has an impact on the estimated risk your insurance company assumes by taking you on as a driver. There also are other risk elements that affect your car insurance, according to the Insurance Information Institute: where you park your car at night, your gender, your age and the kind of car you drive. Also relevant to your rate, according to insurance companies, is your credit score.

The practice of using credit scores in setting insurance rates has been around for at least 20 years. According to at least two studies, a 2003 study done at the McCombs School of Business at the University of Texas at Austin, and a 2007 study by the Federal Trade Commission, there is a statistical correlation between how much a consumer costs an insurance company and that customer's credit score.

The Texas study looked at a random sample of 175,647 people in the state and found that "the lower a named insured's credit score, the higher the probability that the insured will incur losses on an automobile insurance policy, and the higher the expected loss on the policy." The study's authors noted that they did not attempt to explain why credit scoring added significantly to the insurer's ability to predict insurance losses.

The FTC study found that credit-based insurance scores are effective predictors of risk under automobile policies. "They are predictive of the number of claims consumers file and the total cost of those claims," study authors write. "The use of scores is therefore likely to make the price of insurance better match the risk of loss posed by the consumer. Thus, on average, higher-risk consumers will pay higher premiums and lower-risk consumers will pay lower premiums."

It's also important to note that insurance companies don't use traditional credit scores. They build their own scores based on FICO or Experian scores: Basically, companies take your score and use it in their own model.