Annuity

Definition

An annuity is an insurance contract under which an individual exchanges premium for a contractual right to a stream of future payments, typically continuing for the lifetime of the contract owner, with the specific structural features and costs determined by the type of arrangement chosen.

Why it matters

Annuity is the umbrella term for a wide range of structurally different lifetime income arrangements — immediate income annuities, deferred income annuities, fixed annuities, fixed indexed annuities, variable annuities, longevity annuities, and charitable gift annuities, among others. These arrangements differ in how risk is shared, what changes when conditions change, what access to capital is retained, and how costs are charged. Naming the umbrella term directly is what makes the specific arrangement types distinguishable rather than collapsed.

How it works

Every annuity has the same structural transaction at its core: the individual pays premium to an insurer in exchange for a contractual right to scheduled future payments. The variations are in what surrounds the core transaction. Some annuities begin payments immediately (immediate annuities); others defer commencement to a future date (deferred annuities, deferred income annuities, longevity annuities). Some are structured around a fixed crediting rate (fixed annuities, multi-year guaranteed annuities); others around a market index with carrier-set parameters (fixed indexed annuities, registered index-linked annuities); others around investment subaccounts the contract owner directs (variable annuities, often paired with guaranteed living benefit riders that overlay protective features). Some are funded by a single premium; others accept flexible premiums over an accumulation period. The contract is issued by an insurance company, regulated primarily at the state level, and supported by the insurer's general account or, in the case of variable annuity subaccounts, by separate accounts in which the contract owner bears direct investment risk.

In practice

When you encounter the word annuity in a financial context, the operative question is which specific arrangement type is being described — the structural and cost differences across types are substantial. An immediate income annuity and a variable annuity with a guaranteed lifetime withdrawal benefit are both annuities, but they are different categories of arrangement and the comparisons that matter for each are different. A professional working with you on lifetime income should be able to characterize any specific annuity under consideration by its arrangement type, by who bears longevity risk in it, by how it responds to changing conditions, by what access to capital it retains, and by how it charges costs. Plan fiduciaries evaluating in-plan annuity options apply the same characterization at plan level — the relevant comparisons are at the level of the specific arrangement type, not at the umbrella term.

In the Longevity Standard Framework

Annuity is the umbrella term that covers most of the asset-backed claims characterized by the Longevity Standard framework. The four properties — risk sharing, adjustment mechanism, liquidity, cost structure — together characterize any lifetime income arrangement structurally, but they take their specific values at the level of the individual arrangement type rather than at the umbrella level. A SPIA carries the risk sharing — transferred, adjustment mechanism — fixed-contractual, liquidity — none, cost structure — embedded spread profile; a variable annuity with a guaranteed living benefit carries a hybrid risk-sharing profile and a guarantee-charge cost structure; a fixed indexed annuity carries a transferred risk-sharing profile, a discretionary adjustment mechanism, and a crediting parameter drag cost structure. The cost-of-income comparison against the frictionless pool benchmark is computed at the specific arrangement level, with realized value reported for each arrangement against the same baseline. At a representative 12% insurer load, the SPIA — one of the simplest annuity arrangements — delivers realized value of approximately 23% for a focal individual (67F, $500K, 3% real, plan to 90); the comparable figure for other arrangement types varies substantially with their specific claim-property profiles.

Related terms

• Single premium immediate annuity (SPIA)
• Deferred income annuity (DIA)
• Fixed annuity
• Variable annuity
• Fixed indexed annuity
• Annuitization
• Lifetime income
• Asset-backed claim