Definition
A single premium immediate annuity (SPIA) is a lifetime income arrangement in which the contract owner pays a one-time premium to an insurer in exchange for a stream of periodic income payments that begin within one year of purchase and continue for the lifetime of the contract owner or another specified payout structure.
Why it matters
The SPIA is the simplest and most analytically transparent form of commercial lifetime income. Its claim profile is fully fixed at issue, which makes it the structure against which more complex annuity products are typically compared. Because the SPIA is the cleanest example of a transferred-risk arrangement, it serves as the reference structure for evaluating insurer load and realized value across the broader product universe.
How it works
In a SPIA, the contract owner pays the full premium at the start of the contract — there is no accumulation phase, no deferral period, and no surrender value. Income payments commence within one year of issue, typically monthly, and continue under the chosen payout structure: life-only (payments cease at the contract owner's death), joint and survivor (payments continue to a second life), period certain (payments guaranteed for a minimum period), cash refund (any remaining premium paid as a lump sum at death), or installment refund (any remaining premium paid out as continued installments at death). Once the SPIA is in force, the income is locked at the rate set by the insurer at issue, based on the prevailing interest rate environment, the chosen payout structure, the participant's age and gender, and the carrier's mortality and pricing assumptions. The premium becomes the carrier's general account asset; the contract owner's right is limited to the contractually scheduled income payments.
In practice
For an individual purchasing a SPIA, the operative decisions are the premium amount (typically a portion of accessible savings rather than the entire balance), the payout structure (life-only produces the highest income but no continuation; joint and survivor or refund features reduce income in exchange for additional protections), and the timing of purchase relative to the rate environment. SPIA pricing varies materially across carriers — quotes for the same individual at the same income target can differ by several percentage points of premium, which translates to material differences in realized value. A professional working in the cost-of-income framework can compute the implied insurer load on each quote against the frictionless pool benchmark, which is the comparison the payout-rate-only view cannot produce. Plan fiduciaries evaluating SPIA-based in-plan options should require this comparison at the plan's actual pricing.
In the Longevity Standard Framework
The SPIA is the canonical transferred-risk lifetime income arrangement and the reference structure for evaluating insurer load. Because the SPIA's claim profile is fully fixed at issue, the cost-of-income comparison against the frictionless pool benchmark resolves to a single number — the implied insurer load — that captures the carrier's combined cost of administration, profit margin, regulatory capital, and pricing conservatism. At a representative 12% insurer load, a SPIA delivers realized value of approximately 23% for a focal individual (67F, $500K, 3% real, plan to 90); at the same configuration, the SPIA produces net income of $30,563 per year against a frictionless pooled income of $36,843 per year and a solo drawdown income of $28,664 per year (plan to age 90). The SPIA is the structure most directly evaluated by realized value because its fixed-contractual adjustment mechanism eliminates the analytical ambiguity that discretionary or hybrid arrangements introduce.
Related terms
- Immediate annuity
- Deferred income annuity (DIA)
- Annuitization
- Life-only annuity
- Joint and survivor annuity
- Period certain annuity
- Cash refund annuity
- Insurer load