Annuities: Buying Yourself a Paycheck for Life
The one risk you can’t budget around
Every other money problem has a number you can plan against. Retirement saving has a target. A mortgage has a payoff date. But the central problem of spending your savings in retirement has no fixed horizon, because you don’t know your own:
How do you split a finite pile of money across an unknown number of years?
Draw down too aggressively and you risk outliving your savings — the one financial catastrophe with no recovery. Draw too cautiously and you’ll likely die with a fortune you denied yourself. This is longevity risk, and it’s the one risk you can’t diversify away by owning more funds, because it’s about you, not the market.
An income annuity is the financial product built to solve exactly this:
Hand an insurance company a lump sum today. In return, they pay you a fixed amount every month for the rest of your life — however long that turns out to be.
It’s a pension you buy. The simplest version is a single-premium immediate annuity (SPIA): one payment in, a paycheck out starting next month, guaranteed until you die.
What it pays — and why it can beat a bond
Start with the default: a 65-year-old hands over $250,000 and receives income at a 6.2% payout rate — roughly $1,290 a month, for life. Notice that 6.2% is higher than the 3% you might safely earn on the same money in bonds. How can the insurer pay more than the money earns?
The answer is mortality credits, and it’s the whole magic of the product:
The insurer pools thousands of buyers. Some die early and stop collecting; the money they didn’t use is redistributed to those still alive. The longer you live, the more of the pool’s forfeited premiums flow to you.
It’s a return no individual bond can offer, because no bond pays you extra for outliving strangers. This is why an annuity’s payout rate climbs with age — drag Your age now up and watch it rise. A 75-year-old gets a far higher rate than a 55-year-old, because the pool’s life expectancy is shorter and the mortality credits are richer. Buying young, before the credits kick in, is usually a poor deal.
The trade-off: a paycheck for your principal
Nothing comes free. The moment you annuitize, the $250,000 is gone. You can’t get it back, you can’t change your mind, and — for a plain life annuity — there’s nothing left for your heirs. You have traded a pile of money you control for a stream of income you don’t.
So the entire decision comes down to a single gamble against the alternative: keep the money, invest it, and pay yourself the same income. The chart races the two:
- The teal line is the annuity’s cumulative income — a steady climb that never stops.
- The amber line is keeping the money yourself: the income you’ve drawn plus the balance still in the account (the estate you’d leave if you died today).
While your self-managed money lasts, the amber line leads — you’re drawing the same income and sitting on a residual balance. But you’re spending faster than 3% can replenish, so the balance shrinks. Around age 87 in the default, it hits zero: your money runs out. That’s the dashed crossover marker. Past it, the amber line flatlines — you’re broke — while the teal annuity keeps paying.
Reading the gamble
The crossover age is the break-even, and it splits the outcome cleanly:
- Die before it → keeping your money wins. You’d have drawn the same income and still left an estate; annuitizing forfeited that to the insurer’s pool.
- Live past it → the annuity wins. It keeps paying after your own savings are exhausted. That gap — the teal income with no amber line beneath it — is the longevity insurance you bought, and the stat cards tally it up.
So the question an annuity really asks is: do you expect to outlive your own money? Plan to age 95 against money that runs dry at 87, and you’re buying roughly eight years of income you’d otherwise not have — the simulator flags this as the case where the annuity earns its keep.
When you should NOT annuitize
Drag If invested instead, return / yr up to 8% (and pull your age down so the payout falls). Now watch the amber line: it never crosses zero — your money grows faster than you withdraw it, so it lasts forever and still leaves an estate.
An annuity only earns its keep when its payout rate clears what your money can safely earn. If you can reliably out-earn the payout, you’d get the same income for life and keep your principal — the insurer adds nothing.
That’s why annuities look most attractive when interest rates and expected returns are low, when you’re older (richer mortality credits), and when you have no other guaranteed income to lean on. If a pension and Social Security already cover your essential spending, the longevity insurance is less urgent — you’ve already got some.
There’s also a powerful middle path the lesson hints at but doesn’t model: you don’t have to annuitize everything. Many retirees annuitize just enough to cover their fixed costs — a floor of guaranteed income — and keep the rest invested for growth, flexibility, and heirs.
What this simulator leaves out
It models the cleanest case — a plain, single-life immediate annuity — so the core trade-off stays visible. Real annuities add wrinkles, most of which make them worse, not better:
- Inflation. This payout is fixed in nominal dollars. At 3% inflation, a $1,290 check buys roughly half as much in 25 years. Inflation-adjusted annuities exist but start with a much lower payout.
- Fees and complexity. SPIAs are cheap and transparent. Variable and indexed annuities bolt on investment accounts, surrender charges, and rider fees that can quietly consume much of the benefit — a different and often far worse product wearing the same name.
- Survivor and refund options. You can buy versions that keep paying a spouse, or refund the unused premium to heirs — but each guarantee lowers your monthly check, because you’re handing back some of the mortality credits.
- Credit risk. The guarantee is only as good as the insurer. State guaranty associations backstop annuities up to limits, but it isn’t the federal guarantee that stands behind Social Security.
- Illustrative payout rates. The age-to-payout schedule here is a smooth stand-in, not a real quote; actual rates depend on sex, prevailing interest rates, and the insurer.
Key terms
- Annuity — a contract that converts a lump sum into a stream of payments; an income annuity pays for life.
- Single-premium immediate annuity (SPIA) — the simplest kind: one lump-sum payment in, lifetime income starting right away.
- Premium — the lump sum you hand the insurer to buy the income.
- Payout rate — the annual income as a percentage of the premium; rises with the buyer’s age.
- Mortality credits — the extra return survivors earn because early-dying members of the pool forfeit their premiums; what lets an annuity out-pay a bond.
- Longevity risk — the risk of outliving your savings; the risk an annuity is designed to remove.
- Annuitize — to irrevocably exchange a lump sum for the income stream, giving up access to the principal.
An annuity is insurance, not an investment — you buy it for the same reason you buy any insurance: to offload a risk too big to carry alone. Here that risk is living a long time with no paycheck. The math is the retirement-drawdown problem turned into a product, and it leans on the same time-value-of-money logic as every compounding lesson — only run in reverse, as you spend the money down.