Category: Insurtech · Reviewed by Mark Fox, Broker · Renewals · Last reviewed 2026-06-05
Parametric insurance, also called index insurance or trigger insurance, is a form of insurance in which the obligation to pay is triggered by the occurrence of a defined external parameter — for example an earthquake magnitude at a specified location, a hurricane wind speed crossing a defined latitude/longitude, or a defined rainfall deficit — rather than by indemnity for actual loss suffered by the insured.
Category: Insurtech Also known as: Index insurance, Trigger insurance Established: Conceptual origins 1990s catastrophe bonds; commercial mass-deployment from c. 2010 Related concepts: Insurance-linked securities, Reinsurance, Captive reinsurance
A parametric contract pays a fixed sum (or a sum calculated by formula from the parameter) on the occurrence of a defined parameter. Common parameters include: earthquake moment magnitude (MMI) at a defined epicentre; hurricane category and minimum central pressure at landfall; rainfall accumulation over a defined period within a defined geographic area; temperature anomalies; flood gauge readings; commodity index movements. Parametric contracts are typically settled within days of the triggering event, with no loss-adjustment process.
Parametric contracts must satisfy the requirement of insurable interest to be valid as insurance under English law (Marine Insurance Act 1906 section 4; Life Assurance Act 1774 section 1). The structure must be calibrated such that the parametric payout is reasonably correlated with the insured’s likely loss — otherwise the contract may be characterised as a gambling contract or as a derivative subject to financial services regulation rather than insurance regulation. PRA SS5/16 addresses the treatment of parametric and other non-indemnity contracts in internal models. EIOPA published a Discussion Paper on parametric insurance in 2023.
The principal regulatory question is the distinction between an insurance contract and a derivative under the Financial Services and Markets Act 2000 (Regulated Activities) Order — see Department of Trade and Industry v St Christopher Motorists’ Association [1974] 1 WLR 99 for the classical test.
Parametric products are widely used in catastrophe risk transfer (sovereign disaster risk financing — e.g., the Caribbean Catastrophe Risk Insurance Facility, CCRIF; the African Risk Capacity, ARC), agricultural insurance (rainfall-based crop covers), and large-corporate captive reinsurance. The “basis risk” — the difference between the parametric payout and the insured’s actual loss — is the principal commercial issue and must be managed by structuring the parameter carefully.
Cat-in-a-box: payment triggered if a defined catastrophic event occurs within a defined geographic box. Modelled-loss trigger: payment based on a modelled estimate of industry-wide loss (rather than purely physical parameter). Hybrid parametric-indemnity covers combine a parametric trigger with a maximum-loss indemnity backstop.
A Caribbean island sovereign insured under CCRIF for tropical cyclone risk would receive an agreed payout (e.g., $20m) on the occurrence of a Category 4 hurricane within a defined polygon, paid within 14 days, with no need to demonstrate or quantify actual loss. The parametric structure allows immediate liquidity for disaster response.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-05. Next review: 2026-12-05.
Apex Insurance Brokers Limited. Authorised and regulated by the Financial Conduct Authority, FRN 724952. Registered in England and Wales, Companies House 07014570. This entry provides general information about UK insurance concepts and is not regulated advice. Consult your insurance broker on your specific position.
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