A regulator cannot read every annual statement in depth. So the NAIC runs 13 quick ratios that flag which insurers deserve a closer look. Your job is to compute them and read what an out-of-range value is warning about.
IRIS ratios come straight from the statutory annual statement. Each ratio compares two reported figures, usually against policyholders' surplus (PHS), the statutory net worth that absorbs adverse experience. The NAIC sets a usual range for each. Fall outside it and the ratio prints as unusual.
KEY: No single unusual ratio condemns a company, and no fixed count triggers review. Analysts note which ratios print unusual and by how much they deviate. An unusual value is not necessarily adverse; financially stable insurers can show several in some years, as when equity-market swings move the surplus divisor.
The 13 ratios split into four families.
A result exactly at a published value is flagged unusual. The manual's range table reads unusual values "equal to or over" (or under) each threshold, so the usual ranges above are strict.
Common mistakes
- Reading positive reserve development as favorable. In IRIS a positive value means reserves proved deficient. Ratio 11 of +22.2% is adverse; redundancy would show as a negative ratio inside the range.
- Dividing reserve development by current surplus. Ratio 11 divides by prior year-end surplus and Ratio 12 by second-prior; only Ratio 13 uses current surplus. Grabbing today's surplus for all three miscomputes two ratios.
- Using net premiums for Ratio 1. Ratio 1 is gross (900% ceiling); Ratio 2 is net (300% ceiling). Swapping them mislabels leverage and can flip an unusual call.
Bottom line
- IRIS is the Insurance Regulatory Information System: 13 financial ratios in 4 groups (overall, profitability, liquidity, reserve) computed from the annual statement.
- Each ratio has a published usual range; a value outside it, or exactly at the published threshold, is flagged unusual.
- No fixed count of unusual ratios triggers review; analysts note which ratios are unusual and by how much they deviate.
- Net premiums written to surplus usual ceiling is 300%; gross premiums written to surplus usual ceiling is 900%.
Exam shortcut
Anchor the flag points you will reuse most: net premiums to surplus 300%, gross to surplus 900%, agents' balances 40%, and the reserve trio at 20%, 20%, and 25%. A result equal to the published value is unusual. Match each reserve ratio to its surplus vintage: prior year for Ratio 11, second-prior for Ratio 12, current for Ratio 13. Read the sign on reserve development first.
The full lesson (about 2,653 words, 18 min read) adds 2 worked examples, all 7 common mistakes, a self-check, free in the app.
Learning objectives
- C4
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