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NAIC complaint ratio is a simple score that shows how many complaints an insurance company receives compared to its size. The National Association of Insurance Commissioners (NAIC) publishes this data for free. It covers thousands of insurers across all 50 states. A big insurer will naturally get more complaints than a small one. However, the NAIC complaint ratio adjusts for that by comparing complaints to market share.
As a result, you can fairly compare a national giant with a small regional carrier. For drivers shopping for auto insurance, this is one of the few objective tools available. It measures how real customers feel after they file a claim, ask for a refund, or dispute a bill. Price matters, but service matters most when you need help. That is why checking the NAIC complaint ratio before you buy is a smart habit.
What Is an NAIC Complaint Ratio and How Is It Calculated?
The NAIC calls this score a “complaint index.” Most consumers and insurance sites call it the NAIC complaint ratio. Both terms mean the same thing. The score compares an insurer’s share of complaints to its share of premiums in a given line of business, such as private passenger auto.
The formula has two parts. First, the NAIC divides the company’s confirmed complaints by the total complaints for all companies. Second, it divides the company’s premiums by the total premiums for all companies. Then it divides the first number by the second. The national average is always set at 1.00.
For example, imagine an insurer writes 5% of all auto premiums nationwide. If it also receives 5% of all auto complaints, its score is 1.00. That is exactly average. If it receives 10% of complaints, its score is 2.00. That means twice as many complaints as expected for its size. In contrast, a company with 2.5% of complaints would score 0.50, or half the expected amount.
The data comes from closed complaints that state insurance departments report to the NAIC Complaints Database System. In most cases, the NAIC only counts complaints that a state regulator confirmed and closed. Scores are typically based on the prior calendar year of data.
How to Read the Numbers
A lower NAIC complaint ratio is better. Any score below 1.00 means the company gets fewer complaints than expected. Any score above 1.00 means it gets more. The table below shows a general way to interpret the results.
| Complaint Index | What It Means | Complaints vs. Expected |
|---|---|---|
| 0.00 – 0.49 | Excellent | Less than half the expected amount |
| 0.50 – 0.99 | Better than average | Fewer than expected |
| 1.00 | Average | Exactly as expected |
| 1.01 – 1.99 | Worse than average | More than expected |
| 2.00 and above | Poor | Double or more the expected amount |
Context matters, however. A small insurer might receive only three or four complaints in a year. Yet its NAIC complaint ratio could jump above 3.00 because its market share is tiny. As a result, small companies can show volatile scores from year to year. Always check the raw complaint count alongside the index.
The NAIC also shows why people complained. Common reasons for auto insurance complaints include claim delays, unsatisfactory settlement offers, claim denials, and premium increases. Other frequent issues include policy cancellations and nonrenewals. For example, a company with many “delays” complaints may have slow claims staff. A company with many “premium and rating” complaints may raise rates aggressively at renewal.
Trends also matter. The NAIC tool typically shows several years of data. A company improving from 1.80 to 0.90 over three years is moving in the right direction. In contrast, a company sliding from 0.70 to 1.60 may have new service problems.
What the Ratio Does Not Tell You
The NAIC complaint ratio is useful, but it has limits. First, it only counts complaints filed with state regulators. Many unhappy customers simply switch companies without filing anything. As a result, the score likely understates true dissatisfaction.
Second, not every complaint means the insurer did something wrong. Some complaints are resolved in the company’s favor. Even so, the NAIC complaint ratio still reflects friction between customers and the company. Frequent disputes are a warning sign either way.
Third, the score does not measure financial strength. An insurer with a great complaint record could still be on shaky financial ground. For that, check ratings from agencies like AM Best, S&P, or Moody’s. In most cases, an “A” rating or better from AM Best signals strong claims-paying ability.
Fourth, the score does not measure price. A company with an excellent service record might still charge $300 more per year than a competitor. Typically, smart shoppers balance cost, service, and financial strength together.
Finally, scores differ by state. Some state insurance departments publish their own complaint data. For example, the Texas Department of Insurance and the California Department of Insurance both post company complaint rankings. These state numbers may use different formulas, such as complaints per 1,000 policies. Always note which method a source uses.
How to Look Up an Insurer’s NAIC Complaint Ratio
Looking up a company’s NAIC complaint ratio takes about five minutes. The data is free and requires no account. Follow these steps.
Step 1: Go to the NAIC Consumer Insurance Search tool at content.naic.org. Choose the option to search for complaint information.
Step 2: Enter the insurer’s name. Be careful here. Large brands often operate through several legal companies. For example, one well-known brand may have a dozen separate underwriting companies with different scores.
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Step 3: Check your policy declarations page or quote. It lists the exact underwriting company name. Typically, it also lists a five-digit NAIC company code. Searching by that code gives the most accurate result.
Step 4: Select “Private Passenger” as the coverage type. Auto insurance scores are reported separately from home or life insurance. A company can rank well in one line and poorly in another.
Step 5: Review the complaint index, total complaints, and complaint reasons. Compare at least three insurers before you decide.
Using Complaint Data When Shopping for Auto Insurance
Complaint data works best as one part of a bigger decision. Start by collecting three to five quotes for the same coverage limits. Then check each company’s NAIC complaint ratio for private passenger auto. Cross off any insurer with a score well above 2.00 and a meaningful number of complaints.
Next, compare the remaining options on price and financial strength. For example, suppose Company A costs $1,650 per year with a 0.45 index. Company B costs $1,580 with a 2.30 index. Paying $70 more for stronger service may be worth it. A single slow claim after an accident can cost far more in rental cars and stress.
You can also use complaint data with your current insurer. If its score is rising, read the complaint reasons. Look for patterns that match your own experience. If problems keep growing, it may be time to shop at renewal.
If you have a dispute with your own insurer, you can file a complaint too. Contact your state insurance department first. Most states accept complaints online. In most cases, the regulator forwards your complaint to the insurer and requires a written response, often within 15 to 30 days. Keep copies of all letters, emails, and claim notes. Your complaint, if confirmed, becomes part of the national data.
Frequently Asked Questions
What is a good NAIC complaint ratio for car insurance?
Any NAIC complaint ratio below 1.00 is better than the national average. Scores under 0.50 are typically considered excellent. However, always check the total number of complaints, especially for small insurers.
Is a complaint index of 0 possible?
Yes. A company with zero confirmed complaints in a year will show 0.00. In most cases, this happens with smaller or regional insurers. As a result, a zero score is positive but may reflect a small customer base.
How often is the NAIC complaint ratio updated?
The NAIC typically updates its complaint data once a year. Each NAIC complaint ratio is based on closed complaints from the previous calendar year. For example, data published in 2026 generally reflects complaints closed in 2025.
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Official Sources & Resources
For verified information on auto insurance regulations and consumer protection:
- NAIC (National Association of Insurance Commissioners): naic.org
- Insurance Information Institute: iii.org
- Federal Trade Commission — Auto Insurance: consumer.ftc.gov
- USA.gov — Car Insurance: usa.gov/car-insurance
Content last reviewed October 2026. If you notice any outdated information, please contact us.