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🔍 '''Look-back period''' refers to a defined window of time — typically stretching months or years into the past — during which an insurer examines an applicant's or policyholder's historical [[Definition:Loss history | loss history]], [[Definition:Claims experience | claims experience]], or other underwriting-relevant data to inform current decisions. In [[Definition:Workers' compensation insurance | workers' compensation]], for example, a look-back period often spans three to five policy years and directly feeds into the [[Definition:Experience modification rate (EMR) | experience modification rate]] calculation. The concept also surfaces in [[Definition:Claims-made policy | claims-made policies]], where the look-back period — sometimes called the [[Definition:Retroactive date | retroactive date]] window — determines how far back in time a policy will respond to claims arising from prior acts.

⚙️ During [[Definition:Underwriting | underwriting]] or [[Definition:Policy renewal | renewal]], the insurer pulls loss data from the defined look-back window and uses it to gauge the applicant's risk profile. A commercial property account with three large [[Definition:Claim | claims]] in the past five years will price differently from one with a clean record over the same span. In [[Definition:Experience rating | experience-rated]] programs, actuaries weight losses within the look-back period against expected losses for the [[Definition:Classification code | classification]] to produce a premium modifier. The boundaries of the look-back period matter enormously: extending it captures more data but may penalize an insured for events that no longer reflect current risk management practices, while shortening it can mask troubling trends.

💡 For insureds and their [[Definition:Insurance broker | brokers]], understanding the look-back period is essential to managing premium outcomes and coverage scope. A business preparing for renewal can take proactive steps — strengthening safety programs, closing open claims, or documenting corrective actions — within the look-back window to improve its profile before an [[Definition:Underwriter | underwriter]] reviews the account. On the claims-made side, failing to appreciate how the look-back period interacts with the [[Definition:Retroactive date | retroactive date]] can leave policyholders with unexpected [[Definition:Coverage gap | coverage gaps]] for incidents that occurred before the designated cut-off. In both contexts, the look-back period acts as a lens through which past performance shapes present-day insurance economics.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Experience modification rate (EMR)]]
* [[Definition:Claims-made policy]]
* [[Definition:Retroactive date]]
* [[Definition:Loss history]]
* [[Definition:Experience rating]]
* [[Definition:Tail coverage]]
{{Div col end}}

Definition:Look-back period - Revision history

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