J-Curve
The J-curve describes the typical result pattern of a reinsurance contract, an underwriting year, or an ILS investment, in which losses are incurred initially before results improve over time.
Concept
The J-curve describes a characteristic result pattern in which an underwriting year, a reinsurance contract, or an investment shows negative or below-average results in the early periods before returns improve over time and typically turn positive – the graphical shape resembles the letter “J”.
Causes in the Reinsurance Business
In traditional reinsurance business, particularly for underwriting years kept open under the Lloyd’s principle, the J-curve effect arises because premium income is booked at the start of an underwriting year, while the associated claims payments – particularly in long-tail liability lines – are incurred over several years and initially weigh on reported results due to conservative regulatory reserving.
Relevance for ILS and Alternative Capital Investors
A J-curve effect is also frequently observed for investments in insurance-linked securities or newly established reinsurance vehicles (start-up syndicates, sidecars), as formation and underwriting costs together with conservative reserving approaches lead to an initially negative return on capital in the early years, before the invested capital is recouped as the business develops as planned.