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📊 '''Unsupported line''' refers to a line of [[Definition:Insurance | insurance]] business — or a portion of an insurer's [[Definition:Risk retention | risk retention]] — that is not backed by [[Definition:Reinsurance | reinsurance]] protection. When an insurer writes a policy and retains the full exposure without ceding any portion to a reinsurer, that retained amount constitutes an unsupported line. The term arises most frequently in discussions of [[Definition:Underwriting capacity | underwriting capacity]], [[Definition:Net retention | net retention]] limits, and the adequacy of an insurer's capital relative to the risks it holds on its own balance sheet.

🔧 In practice, insurers set maximum net line sizes for each class of business — the largest single-risk exposure they are willing to retain after all [[Definition:Reinsurance program | reinsurance programs]] have been applied. An unsupported line exists when the gross written exposure exceeds the combined capacity provided by the insurer's reinsurance treaties and [[Definition:Facultative reinsurance | facultative placements]], leaving a residual amount entirely on the carrier's own account. This can occur deliberately — where the insurer is confident in the risk and wishes to maximize [[Definition:Underwriting profit | underwriting profit]] by avoiding [[Definition:Cession | cession]] costs — or unintentionally, when reinsurance coverage lapses, market capacity contracts, or an individual risk falls outside treaty terms. At [[Definition:Lloyd's of London | Lloyd's]], [[Definition:Managing agent | managing agents]] must demonstrate to the Corporation that their [[Definition:Syndicate | syndicates]]' net retained lines are supported by adequate capital within the approved [[Definition:Funds at Lloyd's (FAL) | Funds at Lloyd's]], and any unsupported excess would trigger supervisory intervention.

⚠️ Carrying significant unsupported lines concentrates catastrophic and attritional loss exposure on the insurer's own [[Definition:Policyholder surplus | surplus]], which is precisely what regulators scrutinize. Under [[Definition:Solvency II | Solvency II]], the [[Definition:Solvency capital requirement (SCR) | solvency capital requirement]] calculation reflects the net retained risk, so a larger unsupported book demands proportionally more capital. In the United States, [[Definition:Risk-based capital (RBC) | RBC]] ratios similarly deteriorate as net retentions grow without corresponding surplus increases. From a strategic standpoint, an insurer that deliberately maintains unsupported lines is making a calculated bet that [[Definition:Loss ratio | loss experience]] will remain favorable enough to justify retaining the full margin; when that bet goes wrong — as it did for several carriers after major [[Definition:Catastrophe | catastrophe]] events like Hurricane Andrew or the Tōhoku earthquake — the financial consequences can be existential. Sound [[Definition:Enterprise risk management (ERM) | enterprise risk management]] requires continuous monitoring of unsupported exposures relative to available capital and risk appetite.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Net retention]]
* [[Definition:Reinsurance]]
* [[Definition:Underwriting capacity]]
* [[Definition:Facultative reinsurance]]
* [[Definition:Solvency capital requirement (SCR)]]
* [[Definition:Risk appetite]]
{{Div col end}}

Definition:Unsupported line - Revision history

PlumBot: Bot: Creating new article from JSON