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📂 '''Line of business (LoB)''' is a classification category used by [[Definition:Insurer | insurers]], [[Definition:Reinsurer | reinsurers]], and regulators to group [[Definition:Insurance policy | insurance products]] and [[Definition:Exposure | exposures]] that share similar [[Definition:Risk | risk]] characteristics, [[Definition:Underwriting | underwriting]] practices, and [[Definition:Regulatory | regulatory]] treatment. Common lines of business include [[Definition:Motor insurance | motor]], [[Definition:Property insurance | property]], [[Definition:General liability insurance | general liability]], [[Definition:Professional indemnity insurance | professional indemnity]], [[Definition:Marine insurance | marine]], [[Definition:Health insurance | health]], and [[Definition:Life insurance | life]] — though the specific taxonomy and nomenclature vary across markets. In the United States, the [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]] defines standardized lines for [[Definition:Statutory accounting | statutory reporting]]; under [[Definition:Solvency II | Solvency II]] in Europe, a distinct set of LoB categories governs [[Definition:Capital requirement | capital calculations]] and [[Definition:Technical provisions | technical provisions]]; and reporting under [[Definition:IFRS 17 | IFRS 17]] introduces further segmentation requirements based on profitability groupings.

🔧 Operationally, LoB segmentation underpins nearly every function within an insurance organization. [[Definition:Actuary | Actuaries]] develop [[Definition:Loss ratio (L/R) | loss ratios]], [[Definition:Reserve | reserves]], and [[Definition:Pricing model | pricing models]] at the LoB level because the loss behavior of, say, [[Definition:Workers' compensation insurance | workers' compensation]] bears little resemblance to that of [[Definition:Cyber insurance | cyber liability]]. [[Definition:Underwriting guideline | Underwriting guidelines]], [[Definition:Risk appetite | risk appetite]] frameworks, and [[Definition:Delegation of authority | delegations of authority]] are typically defined per LoB, and management reporting tracks [[Definition:Combined ratio | combined ratios]], [[Definition:Premium | premium]] growth, and [[Definition:Claim | claims]] development by line. [[Definition:Reinsurance | Reinsurance]] purchasing is also structured along LoB boundaries — a carrier might buy an [[Definition:Excess of loss reinsurance | excess of loss]] treaty for its property book and a separate [[Definition:Quota share | quota share]] for its casualty portfolio. In [[Definition:Lloyd's | Lloyd's]], [[Definition:Syndicate | syndicates]] report their performance by defined Lloyd's market classes, which map to — but do not perfectly align with — LoB categories used in other regulatory regimes.

📊 Strategic decisions at insurance companies are often framed in LoB terms: entering or exiting a line, adjusting the mix of short-tail versus long-tail business, or allocating [[Definition:Capital | capital]] among lines based on [[Definition:Return on equity (ROE) | return on equity]] targets. Investors and [[Definition:Rating agency | rating agencies]] evaluate carriers partly on whether they demonstrate disciplined LoB management — writing lines where they possess genuine expertise and pulling back from lines where results deteriorate. For [[Definition:Insurtech | insurtechs]] and [[Definition:Managing general agent (MGA) | MGAs]], choosing the right LoB to target is a foundational strategic decision, since each line has its own data requirements, regulatory barriers, distribution dynamics, and competitive landscape. As new risk categories emerge — [[Definition:Climate risk | climate]], [[Definition:Cyber insurance | cyber]], [[Definition:Parametric insurance | parametric]] — the industry continually debates whether they constitute new lines of business or extensions of existing ones, a classification question with real consequences for reserving, capital, and regulatory treatment.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Class of business]]
* [[Definition:Combined ratio]]
* [[Definition:Risk appetite]]
* [[Definition:Statutory accounting]]
* [[Definition:IFRS 17]]
* [[Definition:Solvency II]]
{{Div col end}}

Definition:Line of business (LoB) - Revision history

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