Business insurance ratings methodology
NerdWallet rewards business insurance companies for reliability and good service. We calculate star ratings based on scores in about a dozen categories. These include:
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Each company's financial strength.
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How many complaints customers made relative to its market share.
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How easy it is to get coverage.
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How accessible customer service is.
Our editorial team routinely fact-checks and updates these data points. We also adjust our scoring on an ongoing basis. This helps our star ratings reflect changing industry norms. For instance, in 2026, we began evaluating how easy insurers make it to add an additional insured.
Our ratings are a guide. But insurance policy details and prices can vary widely. We encourage you to shop around and compare several insurance quotes.NerdWallet does not receive compensation for any reviews. Read our editorial guidelines. Insurer complaints methodology
One key factor in our star ratings is how many complaints insurance companies get. Here's how we arrive at that score.
Disappointed customers can file a complaint with their state's insurance department. The National Association of Insurance Commissioners (NAIC) collects, analyzes and groups complaints by business line and insurance company every year. A business line is a specific type of coverage, like workers’ comp.
Then, the NAIC calculates a complaint ratio for each company. It divides the company's share of complaints by its share of total premiums for each line of business. It then adds these ratio values to their official complaint index.
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A complaint ratio of 1 means a company received about the expected number of complaints relative to its size.
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A ratio of 2 means it received twice as many complaints as expected.
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A ratio of 0 means it received half as many complaints as expected.
NerdWallet obtains the raw NAIC data every year. We aggregate results at the company level and fact-check these results. Then we calculate a three-year average of each insurer's complaint ratio and convert it to a score for our star ratings.
Business insurance star ratings consider complaints about two lines of business: commercial liability and commercial property. We analyze complaint data on commercial auto and workers' comp policies too. But we don't currently incorporate these into our ratings since they're less universal.