Definition
A single premium annuity is any annuity contract funded by a single lump-sum premium payment at issue, with no provision for subsequent premium contributions — the structural alternative to a flexible-premium annuity, which accepts premium contributions over an extended accumulation period.
Why it matters
The single-premium funding structure is what distinguishes the most analytically tractable annuity arrangements — SPIAs, single-premium DIAs, single-premium fixed annuities, single-premium fixed indexed annuities — from their flexible-premium counterparts. Naming the funding structure separately allows the framework to treat the funding decision as a distinct structural choice from the arrangement-type decision.
How it works
A single premium annuity is funded by one lump-sum premium paid at the contract's issue date. The most common single premium annuity is the single premium immediate annuity (SPIA), in which the premium is paid and income commences within twelve months. Single premium deferred annuities include the deferred income annuity (DIA), the single-premium fixed annuity (often a multi-year guaranteed annuity, or MYGA), the single-premium fixed indexed annuity, and the single-premium variable annuity. The carrier issues the contract on the basis of the single premium, applies the contractual pricing assumptions at the premium date, and begins the income, accumulation, or deferral phase as specified. Once issued, the contract cannot accept additional premium contributions — additional capital must be placed in a new contract, which is priced under the carrier's then-current rate environment. The single-premium funding structure is the standard structure for income-focused annuity purchases, where the premium represents a deliberate allocation of accumulated capital into a lifetime income arrangement.
In practice
For an individual considering an annuity purchase as part of a retirement income plan, the single-premium funding structure is the typical match — the relevant capital is already accumulated and the purchase is a deliberate allocation rather than an ongoing savings vehicle. The single-premium structure also locks the contract's pricing into the rate environment prevailing at the purchase date, which makes the timing of the premium consequential. A professional advising on a single premium annuity purchase should discuss explicitly whether the relevant capital is the appropriate amount to lock in at the prevailing rate environment, and whether any portion should be staged across multiple contracts issued at different times to diversify rate-environment exposure. Plan fiduciaries evaluating single-premium in-plan annuity options apply the same staging consideration at plan level.
In the Longevity Standard Framework
The single-premium funding structure does not by itself determine any of the four claim properties — the specific arrangement type underneath the single-premium designation determines the claim profile. A single premium immediate annuity (SPIA) carries the risk sharing — transferred, adjustment mechanism — fixed-contractual, liquidity — none, cost structure — embedded spread profile; a single premium DIA carries the same profile with deferred commencement; a single premium MYGA carries a different liquidity profile (conditional, subject to a surrender schedule) and the same embedded-spread cost structure. The cost-of-income comparison against the frictionless pool benchmark is computed at the level of the specific arrangement type rather than at the level of the funding structure. At a representative 12% insurer load, the SPIA — the canonical single premium annuity — delivers realized value of approximately 23% for a focal individual (67F, $500K, 3% real, plan to 90).
Related terms
- Single premium immediate annuity (SPIA)
- Deferred income annuity (DIA)
- Multi-year guaranteed annuity (MYGA)
- Flexible premium variable deferred annuity
- Annuitization
- Fixed annuity
- Accumulation phase
- Distribution phase