PlumBot: Bot: Creating new article from JSON

2026-03-16T08:56:45Z

Bot: Creating new article from JSON

New page

📋 '''Subject premium income (SPI)''' is the measure of [[Definition:Premium | premium]] that serves as the reference base for calculating [[Definition:Reinsurance | reinsurance]] pricing, attachment points, and limits within a reinsurance contract. In a typical [[Definition:Treaty reinsurance | treaty]] arrangement, the SPI defines the denominator against which key contractual parameters are expressed — for instance, an [[Definition:Stop loss treaty (also aggregate stop loss) | aggregate stop loss]] might attach at 85% of SPI, or a [[Definition:Reinsurance premium | reinsurance rate]] might be quoted as a percentage of SPI. The precise definition of SPI — whether it encompasses [[Definition:Gross written premium (GWP) | gross written premium]], [[Definition:Net written premium (NWP) | net written premium]], [[Definition:Net earned premium | net earned premium]], or some other variant — is negotiated between the [[Definition:Ceding company | cedant]] and the [[Definition:Reinsurer | reinsurer]] and documented explicitly in the treaty wording.

⚙️ Defining SPI correctly is one of the more detail-intensive aspects of structuring a reinsurance program. The choice of premium measure directly affects the economics of the contract: a broader SPI base (such as gross written premium before outward cessions) produces a larger denominator, which lowers the effective attachment point when expressed as a loss ratio and increases the absolute dollar amount of the reinsurer's exposure. Conversely, a narrower base like net earned premium limits the scope. Treaty wordings typically specify whether SPI includes or excludes certain components — such as reinstatement premiums, [[Definition:Return premium | return premiums]], or business ceded to other reinsurance layers — and may provide for adjustments at the end of the treaty period based on actual premium volume versus initial estimates. This adjustment mechanism is critical: most treaties are priced on an estimated SPI at inception, with a minimum and deposit premium paid upfront, followed by a final adjustment once the actual SPI is known. Disputes over SPI calculation — particularly around what business falls within the scope of the treaty — are a recurring source of friction in [[Definition:Reinsurance commutation | commutations]] and treaty settlements.

📊 Getting SPI right matters because it underpins the financial integrity of the entire reinsurance arrangement. An imprecise or ambiguous SPI definition can lead to situations where the reinsurer's exposure is materially larger or smaller than intended, distorting the [[Definition:Risk transfer | risk transfer]] profile and potentially affecting the cedant's [[Definition:Regulatory capital | regulatory capital]] treatment of the treaty. For [[Definition:Actuarial science | actuaries]] modeling the expected performance of a reinsurance program, SPI is a foundational input — errors propagate through every downstream calculation, from [[Definition:Expected loss ratio | expected loss ratios]] to profit commissions to sliding-scale [[Definition:Ceding commission | ceding commissions]]. Market practice around SPI definitions varies: in the [[Definition:Lloyd's of London | London market]], treaty wordings may follow Lloyd's Market Association model clauses, while in Continental Europe and Asian markets, local conventions and regulatory frameworks can influence how premium is measured and reported. Whatever the jurisdiction, experienced [[Definition:Broker | reinsurance brokers]] and treaty [[Definition:Underwriter | underwriters]] treat SPI definitions as a first-order negotiation point rather than boilerplate.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Gross written premium (GWP)]]
* [[Definition:Net earned premium]]
* [[Definition:Treaty reinsurance]]
* [[Definition:Stop loss treaty (also aggregate stop loss)]]
* [[Definition:Ceding commission]]
* [[Definition:Minimum and deposit premium]]
{{Div col end}}

Definition:Subject premium income (SPI) - Revision history

PlumBot: Bot: Creating new article from JSON