NAIC IRIS Ratios: Benchmarks, Flags, and Regulatory Follow-Up

The NAIC IRIS ratios are a standardized set of financial measures the National Association of Insurance Commissioners calculates from every U.S. insurer’s annual statement to flag solvency concerns early. There are thirteen ratios for property/casualty insurers and twelve for life/health insurers, each with a published “usual range.” When four or more of a company’s ratios land outside that range, the NAIC routes the filing to its analyst team for a closer look and, if warranted, assigns a priority designation that tells the state regulator how urgently to investigate.

How IRIS Screening Works

IRIS stands for Insurance Regulatory Information System, a cooperative tool built by the NAIC and state insurance departments to screen insurer solvency on a common scale.¹ Every licensed U.S. insurer files an annual statement with the NAIC containing its balance sheet, summary of operations, investment schedules, and reserve data. IRIS pulls numbers from that filing and runs them through identical formulas for every company of the same type, so a mid-size homeowners insurer is measured against the same yardstick as a national commercial carrier.

The ratios are grouped into four categories per insurer type. For property/casualty companies: overall leverage, profitability, liquidity, and reserve adequacy. For life/health companies: overall financial position, investment quality, surplus relief, and change in operations. Each ratio produces a number. A result that equals or exceeds the upper boundary, or sits at or below the lower boundary, is an “unusual value.” A single unusual result does not mean trouble. The threshold that matters is four or more unusual values across the ratio set, which sends the insurer forward for analyst review.²

Property and Casualty Ratios and Their Usual Ranges

The thirteen P/C ratios ask whether an insurer is writing too much business for its capital base, whether it is actually making money, whether it can pay claims on short notice, and whether its reserves have been realistic.

Overall Leverage

Ratio 1, Gross Premiums Written to Policyholders’ Surplus. Unusual at 900% or higher. Measures total premium volume before reinsurance against surplus.
Ratio 2, Net Premiums Written to Policyholders’ Surplus. Unusual at 300% or higher. Same comparison, but after reinsurance, reflecting the risk the company actually retains.
Ratio 3, Change in Net Premiums Written. Unusual above 33% or below −33%. Rapid growth can strain operations and reserves; a sharp decline may indicate forced retrenchment.
Ratio 4, Surplus Aid to Policyholders’ Surplus. Unusual at 15% or higher. Captures how much of surplus comes from commission credits on ceded reinsurance.

Profitability

Ratio 5, Two-Year Overall Operating Ratio. Unusual at 100% or higher. A combined measure of underwriting and investment performance over two years; 100% means no profit margin.
Ratio 6, Investment Yield. Unusual above 5.5% or below 2.0%. A yield that is too high suggests risky reaching for return; too low can mean poor portfolio management or heavy cash drag.
Ratio 7, Gross Change in Policyholders’ Surplus. Unusual above 50% or below −10%. Tracks year-over-year surplus movement.
Ratio 8, Change in Adjusted Policyholders’ Surplus. Unusual above 25% or below −10%. Strips out certain non-recurring items for a cleaner view of underlying trends.

Liquidity

Ratio 9, Adjusted Liabilities to Liquid Assets. Unusual at 100% or higher. If liabilities match or exceed liquid assets, the insurer may not be able to meet obligations from readily available funds.
Ratio 10, Gross Agents’ Balances to Policyholders’ Surplus. Unusual at 40% or higher. Measures uncollected premiums owed by agents.

Reserves

Ratio 11, One-Year Reserve Development to Policyholders’ Surplus. Unusual at 20% or higher. Shows how much prior-year reserves had to be strengthened. Chronic under-reserving is among the most reliable predictors of insolvency.²
Ratio 12, Two-Year Reserve Development to Policyholders’ Surplus. Unusual at 20% or higher. The same measure stretched over two years to smooth out single-year anomalies.
Ratio 13, Estimated Current Reserve Deficiency to Policyholders’ Surplus. Unusual at 25% or higher. Projects whether current reserves are likely adequate based on historical development.

Life and Health Ratios and Their Usual Ranges

Life and health insurers face a different mix of risks, so IRIS uses a separate set of twelve ratios weighted toward investment performance, surrender behavior, and shifts in product mix.³

Overall

Ratio 1, Net Change in Capital and Surplus. Unusual above 50% or below −10%. Strips out capital contributions and surplus notes to isolate organic growth.
Ratio 2, Gross Change in Capital and Surplus. Unusual above 50% or below −10%. Total surplus movement, including infusions.
Ratio 3, Net Income to Total Income. Unusual below 0%. A negative result means the insurer is losing money after capital gains and losses.

Investment Quality

Ratio 4, Adequacy of Investment Income. Unusual above 900% or below 125%. Measures whether investment income covers interest credited to policyholders. Below 125% means the portfolio is barely meeting contractual obligations.
Ratio 5, Nonadmitted to Admitted Assets. Unusual above 10%. A high share of assets regulators will not count toward solvency weakens what the balance sheet appears to show.
Ratio 6, Real Estate and Mortgage Loans to Cash and Invested Assets. Unusual above 30%. Heavy concentration in these holdings creates illiquidity and market-value exposure.
Ratio 7, Total Affiliated Investments to Capital and Surplus. Unusual above 100%. More money tied up in affiliates than in surplus means a parent’s problems can pull the insurer down.

Surplus Relief

Ratio 8, Surplus Relief. For companies with surplus above $5 million, unusual above 30% or below −99%. For smaller companies with surplus at or below $5 million, unusual above 10% or below −10%. Measures how much reinsurance arrangements are boosting or draining surplus.³

Change in Operations

Ratio 9, Change in Premium. Unusual above 50% or below −10%. Rapid growth may indicate pricing that will not hold up actuarially.
Ratio 10, Change in Product Mix. Unusual above 10%. A sharp shift in the kinds of products being sold suggests strategic instability.
Ratio 11, Change in Asset Mix. Unusual above 5%. Even moderate reshuffling can signal a changed risk appetite or a scramble to meet new obligations.
Ratio 12, Change in Reserving. Unusual above 20% or below −20%. Tracks shifts in the ratio of reserve increases to net premiums.³

What Happens After an Insurer Is Flagged

Once ratios are calculated, NAIC analysts run a two-phase review. Phase I is a high-level screen: analysts look at the raw numbers, set aside unusual values with obvious explanations like a one-time catastrophe loss, and decide which companies merit a deeper look. Phase II is a closer examination of the financial filings, searching for trends the ratios alone cannot capture, such as a pattern of aggressive reserve releases or growing dependence on a single reinsurer.

The output is a priority designation. First Priority identifies companies the NAIC considers most at risk and recommends immediate, intensive review by the home state regulator. Second Priority raises serious concern without the same urgency. Third Priority flags lower-level concern that still warrants monitoring or follow-up. These designations are confidential communications between the NAIC and state insurance departments, used to direct limited regulatory resources toward the companies that need attention first.

How State Regulators Act on IRIS Results

The NAIC calculates ratios and assigns priorities, but regulatory authority sits with the states. When a state regulator receives a high-priority designation, the usual first step is a targeted financial examination.

That authority flows from state statutes based on the NAIC’s Model Law on Examinations, which directs the commissioner to consider “the results of financial statement analyses and ratios” when deciding to examine an insurer.⁴ Examiners go on-site to verify asset valuations, review claims files, test reserve adequacy, and assess management. The model law also calls for a routine examination of every licensed insurer at least once every five years, regardless of IRIS results.

If the examination confirms financial instability, regulators have graduated tools. They can require more frequent reporting, such as quarterly instead of annual statements. They can mandate a corrective action plan with specific steps: cutting premium volume, raising capital, strengthening reserves, or unwinding risky investments. Refusing to cooperate can result in suspension or revocation of the company’s license.⁴ When corrective measures fail, states can petition a court for conservation, rehabilitation, or liquidation under statutes based on the NAIC’s Insurer Receivership Model Act.⁵

Where IRIS Stops and Risk-Based Capital Begins

IRIS is one of two main solvency screens, not the whole picture. Risk-Based Capital (RBC) works alongside it. Where IRIS compares an insurer’s financial ratios against industry norms, RBC calculates the minimum capital an insurer should hold based on the specific risks in its portfolio: investment risk, underwriting risk, credit risk, and interest rate risk.⁶

RBC has its own four-level escalation framework tied to multiples of the Authorized Control Level (ACL):⁷

Company Action Level at 200% of ACL. The insurer must file a plan to restore capital.
Regulatory Action Level at 150% of ACL. The regulator can order corrective actions, including examination.
Authorized Control Level at 100% of ACL. The regulator has authority to take control of the company.
Mandatory Control Level at 70% of ACL. The regulator must place the insurer under control.

In practice the two systems catch different problems. An insurer can hold plenty of capital and clear RBC while its IRIS ratios show adverse reserve development or wild premium swings. Another can keep all its IRIS ratios in the usual range while its RBC ratio slides toward an action level because of concentrated investment risk. A red flag from either system can trigger enhanced oversight.

Public Access to Ratio Results

The NAIC publishes an annual statistical report that lists insurers alphabetically with their IRIS ratio results and the usual-range benchmarks. Anyone can look up a company and see which ratios fell outside the range. The priority designations themselves are a separate matter. They are treated as confidential regulatory communications between the NAIC and state insurance departments, and most states treat examination workpapers and related correspondence as privileged and exempt from public-records requests, though the specific confidentiality protections vary by state. The ratio numbers are visible to the public; the internal assessment of how urgently regulators view them is not.

1
National Association of Insurance Commissioners. Insurance Regulatory Information System (IRIS) Ratios Manual
2
National Association of Insurance Commissioners. Insurance Regulatory Information System (IRIS) Ratios Manual 2024 Edition
3
National Association of Insurance Commissioners. Insurance Regulatory Information System (IRIS) Ratios Manual 2025 Edition
4
National Association of Insurance Commissioners. Model Law on Examinations
5
National Association of Insurance Commissioners. Insurer Receivership Model Act
6
National Association of Insurance Commissioners. Risk-Based Capital
7
National Association of Insurance Commissioners. Risk-Based Capital (RBC) for Insurers Model Act