How Much Monthly Income Will Your Savings Really Produce?

Very few can tell you the number that actually matters: how much reliable monthly income that balance will produce, for as long as they live. Those are two completely different questions — and the gap between them is where most retirement anxiety lives.

Here’s how to run the number yourself.

Start with the income gap

Forget your balance for a minute. Start with what you actually spend. Take the after-tax income you want to live on each year in retirement. Then subtract the income you already have coming in for life:

• your desired annual after-tax income
• minus your Social Security
• minus any pension
• minus any other guaranteed lifetime income

What’s left is your income gap — the amount your savings has to produce every year, on top of what’s already guaranteed, for the rest of your life.

That one number changes everything, because it turns a vague worry (“do we have enough?”) into a specific, answerable question (“can our savings reliably produce this much, every year, adjusted for inflation, for 30-plus years?”).

An example

Say you want $90,000 a year to live comfortably. Between the two of you, Social Security covers $50,000. That means your portfolio doesn’t need to produce $90,000 — it needs to reliably produce the $40,000 gap. Suddenly the question isn’t “is our whole retirement okay?” It’s “can this specific pile produce $40,000 a year, safely, for decades?” That’s answerable. (Illustrative example only — your numbers are your own.)

Why “reliably” is the whole game

Here’s where a lot of online calculators mislead people. They take your balance, multiply by some average return, and hand you a cheerful number. But you don’t live on average returns — you live on income, in a specific order, through good markets and bad. A calculator that assumes a smooth 6% every year ignores the single most dangerous risk in retirement: a bad market in your early years, while you’re withdrawing, which can permanently damage a plan even if the long-run average is fine.

So the real question isn’t “what’s my average return?” It’s “how much of my income is reliable — arriving no matter what the market does?” That’s why serious retirement planning starts by covering your essential expenses with income that doesn’t depend on the market, and only then invests the rest for growth. The gap that’s covered by reliable income is the part you never have to worry about again.

Run your number

You can estimate your own income gap in about two minutes with the subtraction above. It’s the single most clarifying thing most people can do before they retire — and most never do it. If you want to go further and see how reliably your savings can actually fill that gap across all the years and all the markets, that’s exactly what a real reading of your plan does: not an average-return guess, but an honest look at whether the income holds.