What the Research Actually Says About Retirement Income

So let’s do something different and boring: let’s look at what the actual research says about turning a pile of savings into income that lasts. It’s more settled than the noise would suggest — and it points somewhere very specific.

Build a floor. Invest the rest.

Here’s the finding, stripped of the sales pitch: cover your essential, must-pay expenses with income that’s reliable and doesn’t depend on the market — a floor — and invest everything above it for growth. Two buckets, two jobs. The floor keeps you safe; the rest keeps you growing.

This isn’t a matter of taste. Wade Pfau’s work on the retirement-income “efficient frontier” finds that a blend of guaranteed income and a growth portfolio can produce better, more reliable outcomes than either investments alone or annuities alone. Not one or the other — both, in the right proportion. And it directly disarms the most dangerous risk in retirement: if your essentials are covered by income that doesn’t move with the market, a crash early in retirement is frightening but not fatal, because you’re never forced to sell your investments while they’re down.

The one thing guaranteed income does that nothing else can

The honest reason lifetime income even exists as a tool is a mortality credit — a return that comes from pooling longevity risk, not from the market. The academic work of Moshe Milevsky shows it’s real and can’t be replicated by any investment. It’s also exactly why guaranteed income is the wrong tool when liquidity or legacy is your priority. Use it for the narrow job it’s uniquely good at, and not one dollar more.

Where insurance fits — and where it doesn’t

The research (again including Pfau) finds permanent life insurance can play a legitimate role for the right household — as a “buffer asset” you draw from in a down market so you don’t sell investments low, and as a tax-efficient way to leave a legacy. One study by EY modeled combining these tools with a portfolio and found the integrated version improved both income and legacy versus investments alone — though it’s worth knowing that study was commissioned within the insurance industry, so read it as a direction, not gospel. The honest other side: permanent insurance is expensive and complex, and for many people term insurance plus disciplined investing is the better answer. It’s a specific tool for specific jobs.

Why it can’t be a rule or a product

Notice what the evidence gives you: not a magic number like the 4% rule, and not a single product. A structure — whose right size depends entirely on your numbers: your essential expenses, the guaranteed income you already have, your taxes, your timeline, your spouse. Change one of those and the right plan changes. That’s why a rule of thumb can’t do this, and why one product can’t either.

And it’s worth doing well

This isn’t a soft claim. When researchers try to measure the value a good, comprehensive advisor adds, the number is real: Morningstar’s “Gamma” research estimated that better retirement decisions can produce the equivalent of about 22.6% more retirement income, and Vanguard has pegged the value of good advice at roughly 3% a year. Read those studies closely and the value comes from exactly these integrated decisions — how much floor to build, which account to draw from and when, when to convert to Roth, how to keep emotion out of it. Not from picking a hot product. From doing all of it, on purpose.