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Category Insurance

Premiums

Earned Premiums (EP)

Written Premiums (WP)

Used for trade basis expense ratio

Losses

Incurred Losses (L)

Loss Adjustment Expenses (LAE)

Expenses & Other

Underwriting Expenses (UE)

Commissions, salaries, marketing, overhead

Policyholder Dividends (optional)

Net Investment Income (optional)

For operating ratio calculation

Expense Ratio Basis

Trade Basis (UE ÷ WP) Statutory Basis (UE ÷ EP)

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About

The combined ratio is the primary metric for measuring an insurance company's underwriting profitability. It represents the percentage of each premium dollar spent on claims and expenses. A combined ratio below 100% indicates an underwriting profit. A ratio above 100% means the insurer pays out more in claims and expenses than it collects in premiums. The distinction matters: even a 1% miscalculation on a $500M book of business translates to $5M in misallocated capital reserves.

This calculator computes the combined ratio using both trade basis and statutory basis methods for the expense ratio component. The trade basis divides underwriting expenses by WP (written premiums), while the statutory basis uses EP (earned premiums). Results diverge when written and earned premiums differ significantly, which occurs in growing or shrinking books. Note: this tool assumes reported figures are net of reinsurance. Gross-to-net adjustments must be applied before input.

Formulas

The combined ratio is the sum of the loss ratio and the expense ratio. When policyholder dividends are material, a dividend ratio is added as a third component.

CR = LR + ER + DR

The loss ratio measures claims cost efficiency:

LR = L + LAEEP × 100

The expense ratio has two calculation bases. Trade basis uses written premiums. Statutory basis uses earned premiums:

ER_trade = UEWP × 100

ER_statutory = UEEP × 100

The operating ratio extends the combined ratio by subtracting investment income:

OR = CR − IIEP × 100

Where: CR = Combined Ratio (%), LR = Loss Ratio (%), ER = Expense Ratio (%), DR = Dividend Ratio (%), L = Incurred Losses, LAE = Loss Adjustment Expenses, EP = Earned Premiums, WP = Written Premiums, UE = Underwriting Expenses, II = Net Investment Income, OR = Operating Ratio (%).

Reference Data

Combined Ratio Range	Interpretation	Underwriting Result	Industry Context
< 80%	Exceptionally profitable	Strong underwriting profit	Rare; typically niche specialty lines
80% - 90%	Highly profitable	Solid underwriting profit	Well-managed personal lines
90% - 95%	Profitable	Moderate underwriting profit	Typical target for P&C insurers
95% - 100%	Marginal	Slim underwriting profit	Investment income needed for ROE targets
100%	Breakeven	No underwriting profit or loss	All premium consumed by costs
100% - 105%	Slight loss	Underwriting loss	Acceptable if investment income compensates
105% - 110%	Moderate loss	Significant underwriting loss	Requires corrective action
> 110%	Severe loss	Heavy underwriting loss	Unsustainable; capital erosion risk
Typical Industry Benchmarks (U.S. P&C, 2018-2023 avg.)
Personal Auto	CR ≈ 98% - 104% \| LR ≈ 70% \| ER ≈ 27%
Homeowners	CR ≈ 95% - 110% \| LR ≈ 65% \| ER ≈ 28%
Commercial Multi-Peril	CR ≈ 95% - 102% \| LR ≈ 60% \| ER ≈ 33%
Workers' Compensation	CR ≈ 90% - 98% \| LR ≈ 58% \| ER ≈ 30%
General Liability	CR ≈ 98% - 108% \| LR ≈ 68% \| ER ≈ 32%
Medical Malpractice	CR ≈ 100% - 115% \| LR ≈ 75% \| ER ≈ 30%
Inland Marine	CR ≈ 85% - 95% \| LR ≈ 52% \| ER ≈ 35%
Surety	CR ≈ 40% - 65% \| LR ≈ 15% \| ER ≈ 35%
Reinsurance (Global)	CR ≈ 95% - 105% \| LR ≈ 65% \| ER ≈ 32%
Cyber Insurance	CR ≈ 65% - 95% \| LR ≈ 45% \| ER ≈ 30%

Frequently Asked Questions

Trade basis divides underwriting expenses by written premiums. Statutory basis divides by earned premiums. When a book is growing, written premiums exceed earned premiums, making the trade basis expense ratio lower. Conversely, a shrinking book produces a higher trade ratio. The statutory basis is used in NAIC Annual Statement filings. The trade basis aligns expenses with the premiums that generated them chronologically. Most analysts report both; AM Best and S&P use the trade basis by default.

Because insurers earn investment income on the float - premiums collected before claims are paid. A combined ratio of 103% means a 3% underwriting loss, but if investment income yields 5% on reserves, the overall operation is profitable. This is captured by the operating ratio. Warren Buffett has noted that Berkshire Hathaway's insurance operations sometimes run above 100% CR deliberately, because the cost of float (the underwriting loss) is cheaper than alternative capital sources.

Catastrophe losses (hurricanes, earthquakes, wildfires) create spikes in the loss ratio that are not indicative of ongoing underwriting quality. Industry practice separates the "underlying" or "ex-cat" combined ratio from the reported figure. For example, a reported CR of 108% might break down as 95% underlying + 13 points of catastrophe losses. When evaluating an insurer, always request the ex-cat combined ratio and the 10-year average to normalize for event frequency.

LAE includes all costs to investigate, defend, and settle claims. It has two components: ALAE (Allocated LAE) - costs tied to specific claims like legal fees and expert witnesses - and ULAE (Unallocated LAE) - overhead costs like claims department salaries. LAE typically adds 10-15 percentage points to the pure loss ratio. Insurers with efficient claims operations achieve lower ULAE ratios. Some jurisdictions require LAE to be included in the loss ratio; others report it separately.

Property lines (homeowners, commercial property) tend to have lower expense ratios (25-28%) but highly volatile loss ratios due to catastrophe exposure. Casualty lines (general liability, workers' comp) have higher expense ratios (30-35%) due to claims complexity and longer settlement tails, but more predictable loss ratios. Long-tail casualty lines also carry reserve development risk - prior year reserves may prove inadequate, inflating the current year's combined ratio retroactively.

Startup insurers (first 3-5 years) typically run combined ratios of 110-130% because fixed underwriting expenses are spread over a small premium base. The expense ratio alone can exceed 50%. Established carriers target 92-98%. MGAs (Managing General Agents) that do not bear risk should track their gross combined ratio for the business they place, targeting below 95% to remain attractive to capacity providers. A startup should model the path to sub-100% CR by year 4-5 or risk losing reinsurance support.

The combined ratio uses incurred losses, which include case reserves and IBNR (Incurred But Not Reported) estimates. If reserves prove deficient, adverse development increases the combined ratio in future periods. Favorable development decreases it. A company reporting a 95% CR that later takes 8 points of adverse development actually had a 103% CR. Schedule P of the NAIC Annual Statement tracks reserve development over 10 years. Always review the development triangle before trusting a single year's combined ratio.