Handing an insurance company a quarter of a million dollars in exchange for roughly $1,600 a month for the rest of your life may sound smart at age 70. The math looks generous on the surface. A payout rate of about 7.7% beats every Treasury on the curve and dwarfs what banks are paying on cash. The catch is that the payout is not a yield, and several things disappear the moment you sign. This is the classic single-premium immediate annuity (SPIA) decision faced by many retirees who lack a traditional pension.
The 7.7% payout is driven by mortality credits and return of principal, not investment return. The insurer pools your $250,000 with thousands of other 70-year-olds. Those who die early subsidize those who live longer. Each monthly check contains a slice of your own money handed back to you.
Compare that to what the market actually pays on safe money. The 10-year Treasury yields about 4.5% and the 30-year around 5.1%. The current I-Bond composite rate is 4.26%, and the national average 12-month CD sits at 1.65%. None of those approach 7.7%.
What You Actually Give Up
- Liquidity. The $250,000 is gone and cannot be tapped for emergencies. A new roof, a health crisis, a family loan cannot come from this pot. If the rest of your portfolio is thin, that is a serious problem.
- Legacy. A life-only SPIA pays heirs $0 at death, even if death comes next month. Buy the contract, get hit by a bus, and the insurer keeps the balance. For a 70-year-old with adult children counting on an inheritance, that potential heir cost is the full $250,000 on the worst days.
- Inflation protection. The check never grows. A fixed $1,600/month loses roughly a third of its purchasing power over 20 years at about 2% inflation. Social Security at least adjusts, while a plain SPIA does not. The 2026 COLA came in at 2.8%.
A SPIA can earn its keep for a healthy retiree with good genes, without a pension, and who worries more about outliving money than leaving it behind. If the average household spends about $78,535 a year and Social Security covers part of that, using an annuity to plug the essentials gap is defensible.
It fits poorly for retirees in fragile health, those with heirs depending on the principal, or anyone whose liquid reserves outside the annuity are thin. A common rule of thumb is annuitizing no more than the slice needed to cover essential expenses above Social Security.
Smarter Structures Than a Plain Life-Only SPIA
- Partial annuitization. Annuitize only enough to cover fixed essentials (housing, utilities, insurance, food) above Social Security. Keep the rest invested and liquid.
- SPIA laddering. Buy in tranches over five to 10 years. Older ages produce higher payouts, and you avoid locking in one rate environment.
- Period-certain or cash-refund rider. Guarantees heirs receive the balance if you die early. The tradeoff is a lower monthly payout, but the legacy risk goes away.
- TIPS or bond ladder. No mortality credits, but you keep the principal and get inflation adjustment on the TIPS side.
The Bottom Line
The 7.7% payout is your own money coming back plus a longevity insurance premium, and it costs you liquidity, legacy, and inflation protection. Do not confuse the 7.7% payout with a 7.7% return. If guaranteed lifetime income is the goal, consider annuitizing the essentials-only slice, consider a cash-refund rider, and keep the rest of the portfolio working for growth and emergencies. Many experts advise against annuitizing everything. If you do, you may discover later that flexibility was worth more than the extra hundred dollars a month.
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