Definition:Eroding limit
📉 Eroding limit is a policy limit structure in which defense costs, legal expenses, or other allocated loss adjustment expenses reduce the total amount of coverage available to pay claims. Sometimes called a "burning" or "wasting" limit, this arrangement means that every dollar spent on investigation, litigation, or defense eats into the same aggregate cap that would otherwise be available to satisfy a judgment or settlement. Eroding limits are most commonly found in professional liability, directors and officers (D&O), errors and omissions (E&O), and cyber insurance policies.
⚙️ Under an eroding-limit structure, the insurer establishes a single aggregate limit — say, $5 million — that covers both indemnity payments and defense costs combined. As defense counsel bills accumulate, they are deducted from that $5 million cap. In a complex litigation scenario where defense costs reach $2 million before a settlement is even discussed, only $3 million remains for the actual indemnity payment. This contrasts sharply with policies that provide defense costs "in addition to" the limit, where the full limit stays intact regardless of how much is spent on legal fees. Whether a policy uses an eroding or non-eroding structure significantly affects pricing: eroding-limit policies carry lower premiums because the insurer's maximum exposure is capped at the stated limit, whereas non-eroding structures expose the insurer to defense costs on top of the full indemnity amount.
🔍 Understanding whether a limit erodes is one of the most consequential details a risk manager or broker can evaluate when placing coverage. In claims-intensive lines like D&O or employment practices liability, defense costs can consume a surprisingly large share of the policy limit, leaving the insured with far less protection than the headline number suggests. Sophisticated buyers often address this risk by purchasing higher limits, adding excess layers, or negotiating for non-eroding defense cost provisions — though the latter option is not available in all markets or for all product lines. In the London market and across major specialty insurance hubs in Bermuda, Singapore, and the United States, the eroding-versus-non-eroding distinction is a standard point of negotiation in placement discussions and a key variable in coverage benchmarking.
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