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📅 '''Inception date''' is the specific date on which an [[Definition:Insurance policy | insurance policy]] or [[Definition:Reinsurance contract | reinsurance contract]] officially takes effect and coverage begins. It marks the precise moment from which the [[Definition:Insurance carrier | insurer]] assumes risk for the [[Definition:Policyholder | policyholder]], and any [[Definition:Claim | claims]] arising from events occurring before this date generally fall outside the scope of coverage. In [[Definition:Reinsurance | reinsurance]] and [[Definition:Lloyd's of London | Lloyd's]] market transactions, the inception date is a critical reference point recorded in [[Definition:Bordereau | bordereaux]], [[Definition:Slip | slips]], and [[Definition:Policy schedule | policy schedules]].

⚙️ When a policy is bound, the inception date is agreed upon by the [[Definition:Underwriter | underwriter]] and the [[Definition:Insured | insured]] (or their [[Definition:Insurance broker | broker]]) and documented in the [[Definition:Binding authority agreement | binding authority agreement]] or policy contract. Coverage runs from this date through to the [[Definition:Expiration date | expiration date]], defining the [[Definition:Policy period | policy period]]. For [[Definition:Claims-made policy | claims-made policies]], the inception date also interacts with the [[Definition:Retroactive date | retroactive date]] to determine which events are eligible for coverage. In [[Definition:Treaty reinsurance | treaty reinsurance]], inception dates align with the start of the treaty period, and any premiums, [[Definition:Loss ratio (L/R) | loss ratios]], and [[Definition:Earned premium | earned premium]] calculations use this date as the baseline.

💡 Getting the inception date right matters far more than it might seem at first glance. A mismatch between the inception date recorded across different systems — the [[Definition:Policy administration system | policy administration system]], the broker's records, and the reinsurer's books — can trigger coverage disputes, [[Definition:Errors and omissions (E&O) | errors and omissions]] exposure, and regulatory complications. During [[Definition:Renewal | renewals]], gaps between an old policy's expiration and the new policy's inception date can leave an insured without coverage, creating potential [[Definition:Coverage gap | coverage gaps]]. For [[Definition:Insurtech | insurtech]] platforms automating the [[Definition:Quote-to-bind | quote-to-bind]] process, ensuring inception dates are accurately captured and propagated across all downstream data feeds is a foundational requirement for operational integrity.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Expiration date]]
* [[Definition:Policy period]]
* [[Definition:Retroactive date]]
* [[Definition:Effective date]]
* [[Definition:Binding authority agreement]]
* [[Definition:Claims-made policy]]
{{Div col end}}

Definition:Inception date - Revision history

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