Inuring reinsurance
A treaty that applies before another, whose recoveries reduce the loss presented to that other treaty.
Textbook case: a 90 million gross event hits a 30% quota share and a 40 XS 20 layer. The cedant keeps 23 million if the quota share goes first, and 35 if the layer does. Reinsurance is said to inure to the benefit of another treaty when it applies first and its recoveries are deducted from the loss presented to that other treaty. The order of application is not obvious. It must be stipulated, because it changes a program's economics entirely. If a quota share inures to a catastrophe layer, the layer sees losses already reduced by the ceded share, hence a smaller exposure and a lower price. If the order is reversed, the quota share benefits from the layer, and it is the quota share that costs less. The order clause holds together a program made of several overlapping treaties. With no declared order, each reinsurer can argue the other responds first, and the cedant is left carrying a gap nobody acknowledges. Well drafted treaties carry the clause. It must be reread whenever the structure changes, since a treaty added mid-program alters the exposure of every treaty sitting after it.
A cedant holds a 30 percent quota share and a 40 million xs 20 catastrophe layer in 2026. An event costs 90 million gross. The quota share inures first: it absorbs 27 million, and the layer sees only 63 million, of which it pays 40. Were the order reversed, the layer would pay 40 on 90, and the quota share 30 percent of the remaining 50 million, that is 15 million. The cedant would keep 35 net instead of 23.
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