AM Best Rating Explained — How to Check an Insurer's Financial Strength

You're about to buy a life insurance policy, an annuity, or a homeowners policy with a $500,000 dwelling limit. The premium is competitive, the agent is friendly — but none of that tells you whether the company will actually be able to pay a claim ten, twenty, or thirty years from now. That's a different question, and there's a free, publicly available way to check it: an insurer's financial strength rating.

What a financial strength rating actually measures

The best-known of these ratings comes from AM Best, a credit rating agency that specializes in the insurance industry. Its own "Guide to Best's Financial Strength Ratings" describes the rating as "an independent opinion of an insurer's financial strength and ability to meet its ongoing insurance policy and contract obligations."

That's a narrower claim than it might sound. AM Best is explicit that the rating does not address an insurer's claims-handling practices, its willingness to dispute or deny a claim, or whether a specific policy is suitable for you. And in AM Best's own words, the rating "is not a recommendation to purchase, hold or terminate any insurance policy." In plain terms: it tells you whether the company is financially built to pay claims broadly — not whether it will pay your claim without a fight, and not whether the policy itself is a good fit.

The rating scale, from Superior to Poor

AM Best's Financial Strength Rating (FSR) scale runs through seven category levels, each with two "notches" (a plus or minus grade within the category):

• Superior — A++, A+
• Excellent — A, A-
• Good — B++, B+
• Fair — B, B- (AM Best's own language: "vulnerable to adverse changes in underwriting and economic conditions")
• Marginal — C++, C+ (same "vulnerable" language)
• Weak — C, C- (AM Best's own language: "very vulnerable")
• Poor — D ("extremely vulnerable")

Below the letter-grade scale, AM Best also assigns non-rating statuses when a standard grade no longer applies:

• E — the insurer has been publicly placed into conservation or rehabilitation by court order (or a regulator has taken clear action to delay or limit policyholder payments without a court order)
• F — the insurer has been placed into liquidation after a finding of insolvency
• S — the rating is suspended, usually because a sudden event makes it impossible to evaluate the company with adequate information
• NR — not rated (the company has never been rated, or a prior rating was withdrawn)

If you look up a company and see anything other than a standard letter grade, that's worth pausing on.

How to actually look one up

Go to ambest.com and use the company search. Search the insurer's full legal name — the entity that will actually be named on your policy — rather than just the marketing brand on the brochure, since large insurance groups often sell through several differently-named subsidiaries with different ratings.

AM Best isn't the only agency in this business. According to the Insurance Information Institute (III), five independent agencies rate insurer financial strength: A.M. Best, Fitch, Kroll Bond Rating Agency (KBRA), Moody's, and Standard & Poor's. III also flags a real trap: the same letter grade doesn't mean the same thing across agencies. As III puts it, "an A+ from A.M. Best is the next-to-top rating of its 15 categories, but an A+ from Fitch, Kroll or S&P is their 5th-highest rating." III's recommendation is to check a company's rating from two or more agencies before deciding whether to buy or keep a policy, and to check again roughly annually, since ratings can change.

The regulator's side of the check

A financial strength rating tells you what a private rating agency thinks about a company's ability to pay claims. It doesn't tell you whether the company is actually licensed to sell insurance where you live, or whether other policyholders have filed complaints against it. For that, the National Association of Insurance Commissioners (NAIC) — the standards-setting body for state insurance regulators — runs a free Consumer Insurance Search (CIS) tool that lets you confirm an insurer's exact legal name and its subsidiaries (useful since the name on your policy may not match the brand you searched for) and directs you to your state insurance department to verify licensing and check complaint history there.

Between the two, you get a fuller picture than either gives alone: a rating agency's opinion on financial strength, plus a path to your own state regulator's licensing and complaint record on the same company.

Where this fits

This is the same instinct behind checking whether a lender is actually licensed through NMLS Consumer Access, checking a broker or adviser through FINRA's BrokerCheck, or verifying an investment adviser's SEC registration before you trust it: a free, official, or independently published lookup tells you more in a few minutes than a polished website or a confident sales pitch ever will. It's the same underlying question — "can I verify this claim myself, rather than take the seller's word for it?" — just aimed at the company standing behind the policy instead of the person selling it.

What this isn't

This is a description of what financial strength ratings measure and how to look one up — not a recommendation to buy, hold, or avoid any specific insurance product, and not a claim that a high rating guarantees a smooth claims experience. ClearValue Money is a publisher; it doesn't rate insurers, sell insurance, or endorse any named carrier. Ratings can change, and AM Best itself says as much — treat a rating as one input, checked periodically, alongside your state regulator's own licensing and complaint records.