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Insurance businesses should pair revenue growth with measures of underwriting performance, operating costs, solvency, capital returns, and results by product line. Premium growth alone cannot show whether new business is profitable, whether claims or expenses are rising faster, or whether the insurer is strengthening its financial position.
Start with underwriting performance
For each metric, state the reporting period, business segment, accounting basis, numerator, and denominator. Insurers may use different definitions under statutory and other financial reporting, and ratios are not automatically comparable across life, health, property-and-casualty (P&C), title, or non-U.S. businesses.
Loss ratio: how claims compare with earned business
Track incurred losses and loss-adjustment expenses against the relevant earned-premium or insurance-revenue measure, as defined by the insurer’s reporting basis. The loss ratio shows claims cost relative to the earned exposure or revenue base. Where reported consistently, break out catastrophe losses, current accident-year results, and prior-period reserve development; these can materially affect a period’s result, but there is no single decomposition established here for every insurer type.
Expense ratio: how much distribution and operations cost
Track acquisition and operating expenses against the corresponding premium or insurance-revenue base. This separates pressure from claims costs from pressure associated with distribution or operations. Disclose exactly which expenses and which premium or revenue measure are included, since definitions can differ between statutory and other accounting presentations.
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Combined ratio: a summary, not a diagnosis
The combined ratio brings loss and expense performance together. In its 2025 Form 10-K, RLI Corp. defines its combined ratio as the loss ratio—incurred loss and settlement expenses divided by net premiums earned—plus the expense ratio—policy acquisition costs and insurance operating expenses divided by net premiums earned. Under RLI’s stated measure, a ratio below 100% indicates underwriting income per dollar, while a result above 100% indicates an underwriting loss. This is RLI’s explanation of its measure, not a universal definition; check each insurer’s accounting basis and components.
Always show the loss and expense ratios beside the combined ratio. The total can identify a change in underwriting results but cannot tell whether claims or expenses caused it.
Measure financial resilience and capital returns separately
Capital and solvency
Include statutory financial ratios, risk-based capital analysis, and capital or surplus measures. These address financial resilience and regulatory condition—not whether premium growth is profitable. The NAIC’s Financial Data Repository supports IRIS financial ratio reports, financial analysis, risk-based capital analysis, and solvency reviews. The NAIC says the repository covers more than 98% of U.S. premiums and over 4,500 individual insurers, with ten years of annual and quarterly data across insurer types.
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Follow return on surplus alongside the change in surplus, and identify the material drivers: operating results, unrealized gains, capital contributions, dividends, and other gains or losses. This helps show whether growth is accompanied by capital generation. Do not attribute a surplus change to underwriting alone without decomposing the other movements.
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Break out results by line and reporting period
Compare premiums and losses by product or line, period, and accounting basis. A company-wide growth figure can conceal a line where losses are increasing faster than earned premiums, or another where results are improving. Keep mix changes visible, and isolate catastrophe or prior-period reserve effects when the company reports them consistently.
The NAIC’s 2024 mid-year report illustrates why segmentation matters: personal and commercial lines showed different movements in premiums and losses. A single aggregate trend would not capture those differences.
Use industry figures as context, not targets
The NAIC’s 2025 report on full-year 2024 U.S. P&C and title results reported the following historical figures:
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| Measure | 2024 U.S. P&C and title result | How to interpret it |
|---|---|---|
| Combined ratio | 100.7% | 5.4 percentage points worse than the prior year, according to the NAIC report. |
| Net loss ratio | 69.4% | Industry result for the covered lines and period; not a target for an individual insurer. |
| Expense ratio | 31.2% | Industry result for the covered lines and period; definitions and company reporting bases still matter. |
| Policyholders’ surplus | $61.8 billion, up 8.6% | The NAIC attributed the increase to a combination of profitable operations, net unrealized gains, and capital contributions, among other factors, offset by dividends and other losses. |
| Return on surplus | 6.0% | Historical industry result for 2024, not a universal target. |
These numbers describe U.S. P&C and title business for 2024, not every insurer type, jurisdiction, or reporting basis. The NAIC’s industry analysis index also describes reports based on statutory filings covering around 99% of expected filers.
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- Growth: premium or insurance-revenue movement, split by line and period.
- Claims: loss ratio, with catastrophe and reserve effects shown when consistently reported.
- Costs: expense ratio, with its numerator and denominator disclosed.
- Underwriting result: combined ratio alongside both component ratios.
- Resilience: statutory financial ratios, risk-based capital analysis, and surplus or other relevant capital measures.
- Capital generation: return on surplus and a breakdown of the drivers of surplus movement.
Set comparisons only after aligning business line, reporting period, and accounting basis. Customer retention, claims-cycle, complaint, or digital-service measures may also help manage operations, but definitions and suitable benchmarks depend on the insurer and line; the figures above do not establish comparable targets for those measures.
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