Same driver, same car: Why auto insurance quotes can differ by nearly $5,000 a year

A June 2026 analysis by NerdWallet found that U.S. drivers can overpay for auto insurance by an average of $4,914 per year by not comparing rates between carriers. The same driver, insuring the same vehicle with the same coverage level, can receive different car insurance quotes from separate carriers that differ by thousands of dollars annually.

According to the J.D. Power 2025 U.S. Insurance Shopping Study, 57% of U.S. auto insurance customers shopped for a new policy in 2024, the highest rate recorded in the study's 19-year history. The spread between the highest and lowest available quotes is widening as more Americans enter the market. As consumer demand for new quotes has risen, it's prompted closer attention to what may be driving sharp differences in rates across drivers with comparable records, AssuranceAmerica reports.

A Shopping Spike Driven by Record Rate Increases

The increase in shopping activity followed an equally sharp rise in premiums. The U.S. Bureau of Labor Statistics reported that motor vehicle insurance costs rose 22.2% year-over-year through March 2024, the largest increase across all household expense categories tracked in the Consumer Price Index (CPI). That figure pushed a significant share of existing policyholders to get insurance quotes from multiple companies for the first time in years.

J.D. Power's data captured the shift directly: The share of customers actively shopping for new auto coverage climbed from 49% in 2023 to 57% in 2024, a move the study linked to those premium increases. The rate of premium growth slowed to under 2% by the end of 2024. However, shopping behavior has not decelerated in parallel. As a result, more drivers are weighing their options at the same time, making the first quote a driver sees from a given carrier more consequential than ever.

The Math Behind Every Auto Insurance Quote

Insurance carriers each build proprietary pricing models, and the same input variables receive different weights at different companies. That structural difference is the core reason different car insurance quotes can diverge so sharply for a single driver. Understanding how car insurance quotes work requires examining the factors that feed those models.

The most common rating factors include driving record, age, ZIP code, vehicle make and model, annual mileage, prior coverage history, and marital status. A credit-based insurance score (where permitted by state law) is another key factor in calculating the cost of a premium. This score is a numerical rating insurers examine by using credit history to predict the likelihood a driver will file a claim.

One carrier may penalize a low credit-based insurance score more heavily than a competitor. Another may weigh driving history as the dominant variable. Because each company applies its own formula, two identical applicants can emerge from the process with quotes that differ by thousands of dollars. Drivers asking why an insurance quote is so high may not realize the answer can lie entirely in how one carrier weights a single factor compared to another.

What drives the biggest price differences for insurance carriers

Among all rating factors, credit-based insurance score, ZIP code, and prior carrier history tend to produce the widest price swings between carriers. Research published by the Consumer Federation of America (CFA) in 2023 found that consumers with poor credit scores paid, on average, 115% more for auto insurance than consumers with excellent credit, based on otherwise identical driving records.

Income, Credit and Other Socioeconomic Factors Shape What Drivers Pay

Beyond credit, the CFA's research documents a broader pattern of non-driving factors shaping premiums in ways that fall unevenly across demographic lines. In cities studied by the CFA, women between the ages of 40 and 60 with perfect driving records were charged higher rates than men with identical profiles nearly twice as often as the reverse. The pricing difference was not tied to claims history.

Homeownership status presents a similar dynamic. Renters can pay an average of 7% more for auto insurance than homeowners with otherwise identical profiles, according to CFA findings. In some cases studied, renters faced rates up to 47% higher than comparable homeowners. These effects tend to concentrate geographically. Lower-income ZIP codes can carry premiums that are difficult to reconcile with the driving records of the people living there, and in some markets, the cost of legally required minimum coverage may exceed what lower-income households can absorb.

The Insurance Industry's Explanation for Price Differences

The insurance industry offers a different frame for the same data. The Insurance Information Institute (III) has argued that price variation across carriers reflects a highly competitive marketplace, not a structural problem. Dr. Robert Hartwig, former president of the III, has made the case that differing carrier experience and risk modeling lead naturally to different prices for the same applicant, and that this variation is a sign the market is functioning as intended. Under that analysis, the range of available quotes is evidence of competition rather than inequity.

State-by-State Variations in Auto Insurance Regulation

Auto insurance is regulated at the state level, which introduces another structural layer of variation. The rules governing what factors carriers may use, and how much weight those factors may carry, differ substantially across the country. California, Hawaii, and Massachusetts restrict or prohibit the use of credit-based insurance scores in setting auto insurance rates. Most other states allow them, which means the same credit profile may influence a quote in Texas but carry no weight in California.

Minimum liability requirements represent a separate source of regional variation. A state-minimum policy in Florida is structured differently from a state-minimum policy in Maine, both in coverage levels and in cost. Drivers who relocate across state lines often encounter significant quote changes for reasons entirely unrelated to their driving history. The National Association of Insurance Commissioners maintains state-by-state rate filings and consumer disclosure data for drivers seeking to understand how local regulation affects their premiums.

What the Data Shows About Shopping Behavior

The J.D. Power 2025 study reported that 57% of U.S. auto insurance customers shopped for a new policy in 2024, and that 29% of those who shopped switched carriers. The switching rate continued at elevated levels through the first quarter of 2025, suggesting the behavioral shift is durable rather than a short-term reaction to premium increases. Drivers who request quotes from multiple companies are statistically more likely to find lower rates, and the financial gap between the highest and lowest available quotes is wider than in any year on record. Multi-carrier marketplaces have grown alongside the surge in comparison shopping.

This story was produced by AssuranceAmerica and reviewed and distributed by Stacker.

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