Definition
Cost structure is the structural property of a claim that specifies how costs are charged and how transparent they are, with five possible values: none, explicit fee, embedded spread, crediting parameter drag, or guarantee charge.
Why it matters
Different lifetime income arrangements charge their costs in fundamentally different ways. Some are explicit and visible; others are embedded in pricing parameters that are difficult to inspect. The cost structure property names this difference and makes it part of the structural characterization, rather than something that has to be reverse-engineered from disclosure documents.
How it works
Cost structure takes one of five values. None — there is no separate cost above the actuarial value of the arrangement; this applies to the frictionless pool as a benchmark, never to a real product. Explicit fee — costs are charged as visible, separately disclosed fees, typically in direct pool arrangements or fee-only advisory contexts. Embedded spread — the carrier's margin is built into the asset yield supporting the contract and is not separately disclosed; this is the structure of a SPIA, a DIA, and other traditional general-account annuities. Crediting parameter drag — costs are imposed through manipulation of cap rates, participation rates, and spread parameters that determine how much of the underlying index return is credited to the contract; this is the structure of a fixed indexed annuity. Guarantee charge — costs are charged as a separate disclosed fee for an embedded guarantee, layered on top of the underlying contract structure; this is the structure of a variable annuity with a guaranteed lifetime withdrawal benefit, where the rider charge is disclosed separately from the subaccount expense ratios.
In practice
The cost structure property determines how much of the structural pooling benefit reaches the participant — the realized value. A SPIA with embedded spread and a fixed indexed annuity with crediting parameter drag are not just different products; they are different cost-structure categories, and the difference in transparency between them is itself information about how realized value can be evaluated. An individual evaluating any lifetime income arrangement should be able to name which of the five cost-structure values applies, and to identify how the cost is measured and disclosed. Where the cost structure is embedded spread or crediting parameter drag, the implied cost is computable against the frictionless benchmark even if it is not separately disclosed by the manufacturer. Plan fiduciaries should require any proposed in-plan lifetime income option to be characterized by its cost-structure value and to be evaluated for realized value against the frictionless benchmark using the implied load computed from the cost structure.
In the Longevity Standard Framework
Cost structure is one of four claim properties in the Longevity Standard framework. The four properties — risk sharing, adjustment mechanism, liquidity, cost structure — together characterize any lifetime income arrangement structurally. Cost structure and liquidity together describe what the claim means for the participant commercially — the experiential pair of the four-property framework, distinct from the structural pair (risk sharing and adjustment mechanism). The cost-structure property determines how much of the structural pooling benefit reaches the participant — that fraction is the realized value, measured as the market-based uplift over solo drawdown divided by the theoretical uplift over solo drawdown. Cost structure is the property most directly responsible for the gap between the frictionless pool benchmark and the realized arrangement.
Related terms
- Risk sharing
- Adjustment mechanism
- Liquidity
- Realized value
- Insurer load
- Embedded spread
- Crediting parameter drag
- Guarantee charge