A complaint index answers one question: does this insurer draw more complaints than its size would predict? It is the closest thing consumers have to a public report card on how insurance companies treat customers after the sale. But there are at least three versions you are likely to meet, they measure different things, and a number from one cannot be compared with a number from another.
This guide is for educational purposes only and is not personalized insurance advice. We are not licensed insurance agents.
The Short Answer
- A complaint index scales confirmed complaints by company size. Raw counts favor small insurers; an index levels that out.
- Texas publishes an index where 1.00 is the market average. Below 1 is better than average, above 1 worse.
- California publishes a rate: justified complaints per 100,000 policies or exposures.
- The NAIC compiles closed, confirmed complaints from state insurance departments and shows them for the past three years in its Consumer Insurance Search.
- None of them counts every unhappy customer. Only complaints filed with a regulator, and confirmed or found justified, are counted.
What Has to Happen Before a Complaint Is Counted
What has to happen before a complaint is counted
That pipeline explains most of the index’s quirks. A complaint a customer only posts online is not in it. A claim dispute filed in December may close, and be counted, the following year. And a complaint the regulator decides was not the insurer’s fault drops out entirely.
Three Systems, Side by Side
| NAIC | Texas Department of Insurance | California Department of Insurance | |
|---|---|---|---|
| What is counted | Closed, confirmed complaints compiled from state insurance departments | Complaints TDI “confirmed against a licensed carrier” | Justified complaints closed in the year |
| Scaled by | The NAIC says a company’s index varies with its complaints or premiums and with the U.S. market for that type of insurance | Share of complaints ÷ share of policies in force, by line | Complaints per 100,000 policies or exposures |
| Average | — | 1.00 | No fixed average; we compute the median of the 50 insurers |
| Coverage | Past three years, multi-state | Each company and line; the open dataset has auto and homeowners for 2024–2025 | 50 large insurers per line; three-year history |
| Where | Consumer Insurance Search | data.texas.gov dataset pa9u-9s9w | Consumer Complaint Study |
Sources: the NAIC’s guide to researching complaints against insurance carriers, TDI’s dataset notes, and the California Department of Insurance’s study page.
Texas: An Index Where 1.00 Is Average
TDI states the formula: “The complaint index is calculated by dividing the company’s percentage of complaints for a specific line of insurance by the company’s percentage of policies in force for the same line of insurance. The average index is 1.00.”
Worked example from 2025 auto data: State Farm Mutual drew 201 of 2,481 confirmed complaints (8.10%) and held 4,040,188 of 15,057,105 policies (26.83%). 8.10 ÷ 26.83 = 0.30. Tesla Property & Casualty drew 241 complaints (9.71%) on 40,364 policies (0.27%), for 36.24. Our Texas car insurance complaint index and Texas homeowners complaint index rank every insurer with 10,000+ policies.
California: A Rate per 100,000
The California Department of Insurance says its ratio “is based on the number of justified complaints per 100,000 policies or exposures,” and that the study “only includes complaints that are closed for a given year regardless of when the complaints were filed.” In the 2026 auto study, State Farm Mutual’s ratio was 3.1 (121 justified complaints) and the median of the 50 insurers was 3.15. See our rankings of California car insurance complaint ratios and California homeowners complaint ratios.
NAIC: The National Lookup
The NAIC says it “compiles closed, confirmed complaint information about insurance carriers from state insurance departments,” which consumers can look up by state, company and insurance type for the past three years. It also warns that “a company’s complaint index can vary not only due to fluctuations in the company’s complaints or premiums,” but also with changes in “the U.S. market for the type of insurance being sold.” In other words, the NAIC figure moves when the rest of the market moves, even if the company did nothing differently.
The Same Company Can Look Very Different by State
Because each regulator counts its own state’s complaints and its own state’s business, one insurer can score very differently across state lines:
| Insurer (legal company) | Texas, 2025 | California, 2025 |
|---|---|---|
| Lemonade Insurance Company (homeowners) | Index 0.42; 19 complaints on 353,084 policies | 6.3 per 100,000; 27 justified complaints; 43rd of 50 |
| Mercury (auto) | Mercury County Mutual: index 0.90; 7 complaints | Mercury Insurance Company: 1.2 per 100,000; 19 complaints; 9th of 50 |
| Tesla’s insurers (auto) | Tesla Property & Casualty: index 36.24; 241 complaints | Tesla Insurance Company: 142.2 per 100,000; 372 complaints; 49th of 50 |
Sources: TDI complaint indexes and policy counts (2025); California Department of Insurance 2026 Consumer Complaint Studies. Note that Mercury’s two rows are different legal companies.
Tesla is the rare case where the signal is consistent: it is at or near the bottom in both states, and California’s regulator brought enforcement actions over Tesla’s claims handling in October 2025. Our Tesla Insurance review covers it in full.
Five Ways to Misread a Complaint Index
- Reading the brand instead of the company. Indexes are reported by legal insurer. In Texas, many auto policies are written on the paper of a county mutual. TDI’s statistical plan manual says some county mutuals let managing general agents sell insurance “using the County Mutual’s name,” which TDI calls “fronting.” Check the company printed on your declarations page.
- Ignoring the count. An index of 10 built on 20 complaints is a stronger signal than an index of 10 built on 2. Small insurers swing wildly from year to year.
- Mixing scales. A Texas index of 3.0 means three times the average. A California ratio of 3.0 means three justified complaints per 100,000 exposures, which in the 2026 auto study was below the median.
- Mixing lines of insurance. A company’s auto index says nothing about its homeowners or life business. Every system reports by line.
- Treating it as a claim prediction. It is an aggregate. It says regulators confirmed more (or fewer) complaints than expected, not what will happen to your claim.
How to Look Up Your Insurer in 10 Minutes
- Get the legal name from your declarations page or quote (for example, “Allstate Vehicle and Property Insurance Company,” not “Allstate”).
- Search the NAIC’s Consumer Insurance Search for that company and line to see its complaints across states.
- Check your state. Texans can use TDI’s dataset or our Texas auto and homeowners rankings. Californians can use the Department’s study or our auto and homeowners rankings. Other states’ insurance departments publish their own complaint data in different formats.
- Look at three years. One bad year can be a backlog; three rising years is a pattern.
- Weigh it with everything else: financial strength, coverage terms, price and service. Our Nerd Score methodology shows how we combine claims experience with price, coverage and digital tools.
FAQ
What is a good complaint index for an insurance company?
On an index where 1.00 is the market average, such as the Texas Department of Insurance’s, anything below 1.00 means fewer confirmed complaints than an average insurer of the same size. Read it with the raw count: an index built on two or three complaints is weak evidence either way.
Where can I look up an insurance company’s complaints?
The NAIC’s Consumer Insurance Search lets you look up a company’s complaints by state, company and insurance type for the past three years. Texas publishes company complaint indexes as an open dataset, and California publishes an annual Consumer Complaint Study for its largest auto, homeowners and life insurers.
Why is my insurer’s complaint index different in each state?
Each regulator counts complaints filed in its own state and scales them by that state’s business, and each uses its own method. Lemonade Insurance Company, for example, had a Texas homeowners complaint index of 0.42 for 2025 but ranked 43rd of 50 in California’s homeowners study for the same year.
Does a high complaint index mean an insurer will deny my claim?
No. It means regulators confirmed more complaints against that company than its size would predict. It is a signal worth weighing, especially when it is built on many complaints and repeats across years, but it does not predict the outcome of any individual claim.