Indemnity Period

Why it matters for underwriting

The indemnity period is the single figure that caps the maximum duration of a business interruption loss, regardless of how long the actual disruption lasts. An indemnity period that is too short relative to realistic reinstatement or supplier recovery timelines is one of the most frequent causes of an inadequate BI recovery, even when the sum insured itself is correctly calculated. Underwriters use the requested period, together with the complexity of the plant, building and supply chain, to judge whether the account’s true maximum foreseeable loss duration is properly reflected.

Capturing the attribute and evidence

Proposal forms ask for the requested indemnity period in months and the reasoning behind it, typically supported by a business impact analysis, lead-time quotations from key equipment suppliers for long-delivery machinery, and any prior loss history showing actual recovery timelines. Underwriters test the declared period against worst-case scenarios such as total loss of the main production building, destruction of bottleneck machinery with long replacement lead times, or failure of a critical single-source supplier.

Effect on coverage, premium and conditions

A well-substantiated indemnity period that reflects genuine reinstatement, ramp-up and market re-entry timelines supports standard pricing and full limits. A period that appears too short for the exposure typically triggers a recommendation to extend it, while an unusually long period relative to peers increases the rate on line and may prompt closer scrutiny of the underlying reinstatement assumptions or a sublimit on the extended tail.

Mitigation measures

Insurers and brokers recommend basing the indemnity period on a documented business impact analysis rather than a generic market convention, building in contingency time for permitting, procurement and ramp-up, and revisiting the period whenever machinery lead times, supplier dependencies or building complexity change materially.