Definition:Premium split
📋 Premium split describes the allocation of total premium among multiple parties involved in an insurance or reinsurance arrangement. In co-insurance structures, the premium split determines what percentage of the total premium flows to each participating carrier based on its share of the risk. In delegated authority arrangements, the term can also refer to how the premium dollar is divided between the capacity provider, the MGA or coverholder, and intermediaries — encompassing commissions, overriders, and the carrier's net retained premium. The way premium is split has direct consequences for each party's profitability, incentive alignment, and regulatory capital treatment.
⚙️ How a premium split operates depends on the transaction structure. In a co-insurance placement — common in the London market, continental European commercial lines, and large-risk programs across Asia — a broker secures multiple carriers to participate on a single policy, with each carrier's premium share corresponding to its signed line. A carrier writing 25% of a $4 million policy premium receives $1 million and is liable for 25% of any covered losses. In quota share reinsurance treaties, the premium split between cedant and reinsurer follows the cession percentage, with the cedant retaining a ceding commission that compensates for acquisition and administration costs. Multi-layered excess-of-loss programs involve a different kind of split: each layer carries its own premium, and the allocation across layers reflects the probability and severity of losses attaching at each attachment point, as determined by actuarial modeling.
💡 Getting the premium split right is crucial for maintaining sustainable partnerships between carriers, intermediaries, and program administrators. An MGA that negotiates an outsized commission split may deliver short-term revenue growth but risks attracting adverse selection or under-reserving the carrier's portfolio, leading to deteriorating loss ratios and eventual program non-renewal. Conversely, carriers that squeeze intermediary compensation too aggressively may lose access to high-quality distribution and underwriting talent. Regulators in several jurisdictions — including the FCA in the UK and various US state insurance departments — scrutinize premium splits within delegated programs to ensure that sufficient premium is retained by the risk-bearing entity to fund claims and reserves. In insurtech distribution models, where digital platforms and embedded insurance partnerships add new participants to the value chain, premium split design has become an increasingly strategic lever for balancing growth, profitability, and fair customer outcomes.
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