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🛡️ '''Aggregate excess insurance''' is a form of [[Definition:Excess insurance | excess coverage]] that attaches once the total cumulative [[Definition:Loss | losses]] incurred by an insured over a defined period — typically a policy year — breach a specified [[Definition:Aggregate retention | aggregate retention]] or [[Definition:Attachment point | attachment point]], rather than responding to any single loss event. It functions as a ceiling on the insured's overall loss burden, absorbing the volatility that arises when multiple smaller losses stack up beyond what was budgeted or [[Definition:Self-insured retention (SIR) | self-insured]].

📐 The mechanics center on a cumulative trigger. The insured bears all losses — individually and collectively — until the aggregate threshold is met. Once that threshold is pierced, the aggregate excess policy begins to pay, typically up to a defined [[Definition:Policy limit | policy limit]]. This structure is common in [[Definition:Workers' compensation insurance | workers' compensation]], [[Definition:General liability insurance | general liability]], and [[Definition:Auto liability insurance | auto liability]] programs where a large employer or [[Definition:Risk retention group (RRG) | risk retention group]] retains a per-occurrence [[Definition:Deductible | deductible]] or [[Definition:Self-insured retention (SIR) | SIR]] but wants protection against an unexpectedly high frequency of claims in a single year. [[Definition:Actuary | Actuaries]] price these policies by modeling the probability distribution of aggregate losses, factoring in [[Definition:Loss development | loss development]] patterns, historical frequency and severity, and the specific retention structure.

📊 This coverage is especially valuable for organizations with sophisticated [[Definition:Risk management | risk management]] programs that accept individual claim volatility but need to cap their total annual exposure. Without aggregate excess protection, a year marked by unusually high claim frequency — even if no single event is catastrophic — could devastate the insured's financial results. It also plays a structural role in [[Definition:Captive insurance company | captive insurance]] arrangements and large [[Definition:Deductible program | deductible programs]], where the aggregate excess layer effectively defines the boundary between retained and transferred risk. For [[Definition:Reinsurance | reinsurers]] and [[Definition:Excess and surplus lines (E&S) | E&S carriers]] that write these policies, careful [[Definition:Underwriting | underwriting]] of the insured's claims management practices and exposure base is essential to avoid adverse selection.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Aggregate retention]]
* [[Definition:Excess insurance]]
* [[Definition:Self-insured retention (SIR)]]
* [[Definition:Stop-loss insurance]]
* [[Definition:Captive insurance company]]
* [[Definition:Attachment point]]
{{Div col end}}

Definition:Aggregate excess insurance - Revision history

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