Income Annuities: When Buying a Floor Beats Building One

Most pre-retirees assume the safest income floor is one they build themselves, bonds, CDs, a carefully laddered portfolio they never have to trust anyone to run. That assumption is worth pressure-testing, because for a specific slice of the income gap, an insurer can often deliver more monthly income per dollar than you can replicate on your own. The reason is mortality credits, and it changes the SPIA-vs-bond-ladder conversation entirely.

What Mortality Credits Actually Do to the Math

A bond ladder works by matching maturities to spending years. Buy enough bonds maturing each year from 65 to 90, and you have 25 years of covered income. The flaw is that you have to fund all 25 years upfront, including the years you may not reach.

A single-premium immediate annuity (SPIA) pools longevity risk across thousands of annuitants. The premiums of people who die early subsidize the income of people who live long. Those are mortality credits, and they are not available anywhere else. For a healthy 65-year-old in 2026, a SPIA will typically generate 15 to 25 percent more monthly income per dollar than a bond ladder of equivalent credit quality, with the gap widening the older the buyer is at purchase.

A deferred income annuity (DIA), sometimes called longevity insurance, takes this further. Fund it at 65, income begins at 80 or 85. The deferral compounds the mortality credit effect dramatically, and the premium is a fraction of what a SPIA costs, freeing the intervening years' assets to grow.

This is the core of the Roots stage of the Sporos Doctrine: before the portfolio is freed to pursue real long-term return, essential income must be floored so it never has to liquidate into a down market. For many clients, a well-sized SPIA or DIA is the most capital-efficient way to close that gap.

Where Caution Is Warranted

Not all annuity products belong in this conversation. Variable annuities wrapped in income riders, indexed annuities with participation caps and surrender charges running eight to ten years: these are distribution products engineered around a sales commission, not income-floor tools. The test is simple. If you cannot read the guaranteed monthly income figure in plain dollars on page one of the illustration, the product is not a floor, it is a bet dressed as one.

For a SPIA or DIA that passes that test, insurer credit quality is the remaining variable that matters. These contracts are backed by the insurer's general account, not SIDC-protected like a brokerage account. That means you want carriers rated A or better by at least two of the major agencies, and you want to understand your state's guaranty fund coverage limits before committing a large sum to a single insurer.

An inflation rider (typically 1 to 3 percent annual step-up) reduces the initial payout in exchange for purchasing power protection. Whether the trade is worth it depends on how much of your floor this annuity covers and what the rest of your portfolio looks like.

The Question That Changes the Answer

The single fact that determines whether a SPIA or DIA belongs in your plan is not your age or your health. It is the size of your income gap: the distance between guaranteed sources (Social Security, pension) and your essential monthly spending number. A small gap may be closable with a modest bond allocation. A large gap, and the annuity's mortality-credit advantage becomes decisive.

Where plans go wrong is not in the annuity itself. It is in sizing it correctly relative to the full income architecture, accounting for sequence-of-return risk in the portfolio that sits above the floor, and making sure the tax treatment of the income stream fits the wrapper it lives in. Those interactions are where the real planning work happens, and where a conversation about fit is worth having.

The information provided is for educational purposes only and does not constitute investment, legal, or tax advice. Consult with qualified professionals for guidance specific to your situation.