What a credit-based insurance score actually measures.
It shares data with your regular credit score, but it's a different number, built for a different purpose.
It predicts claims, not default risk
Your regular credit score is built to predict whether you'll repay a loan. A credit-based insurance score uses overlapping data, like payment history, length of credit history, and amounts owed, but is weighted to predict how likely you are to file an insurance claim. Statistically, insurers have found the two are correlated, which is why the practice exists at all.
Where it's restricted
Five states currently restrict or ban the use of credit in car insurance pricing: California, Hawaii, Massachusetts, Michigan, and Washington. In every other state, it's one of several factors insurers can legally use, alongside age, location, and driving record.
How much it actually moves your rate
On Open Rate Index, we model this as a credit tier adjustment on top of the filed base rate: excellent credit trending meaningfully below average, fair credit trending meaningfully above it. The exact multiplier a real insurer applies varies by company and state, which is why we label this a modeled adjustment rather than a filed number.
What you can actually do about it
You can request your credit-based insurance score disclosure from an insurer that used it to price you, and you can dispute inaccurate information on the underlying credit report through the credit bureau. Paying down revolving balances and avoiding new hard inquiries before you shop tends to help both your regular and insurance-specific scores together.