“The stock market returns about ten percent a year” is one of the most repeated figures in finance. It is also one of the most misleading, because it quietly skips the two things that take the largest bites out of what you actually keep: inflation and tax.
There is a number that gets quoted so often it has hardened into folk wisdom: stocks return roughly ten percent a year over the long run. People plan their futures around it, imagining their money roughly doubling every seven years, compounding serenely toward wealth. The figure is not invented. But it is a gross, nominal number — and the distance between that number and what ends up in your pocket is where most financial disappointment is born.
The headline return is the beginning of the calculation, not the end. Two forces stand between it and reality, and both are routinely left out of the sentence.
The first bite: inflation
The first deduction is the one we have met before in another form: inflation. A return has to be measured against what your money can actually buy, not just against the number of dollars.
If an investment grows by ten percent in a year while prices rise by three to four percent, your real return — the growth in actual purchasing power — is not ten percent. It is closer to six or seven. The other three or four percent did not make you richer in any meaningful sense; it merely kept pace with the rising cost of everything. You have more dollars, but each dollar buys less, and the part of your “gain” that exactly offsets that erosion is not a gain at all. It is standing still while appearing to move.
This is the money illusion applied to investing. The nominal return flatters; the real return tells the truth. Any long-run figure quoted without subtracting inflation is describing a world where prices never rise — a world that has never existed.
The second bite: tax
The second deduction is the one people forget even more reliably: tax. Investment gains are, in most cases and most places, taxed — on the profits when you sell, on the dividends along the way, sometimes on both.
The exact rate depends on where you live, how long you held the investment, and the kind of account it sits in, so no single figure applies to everyone. But the principle is universal: the return you actually keep is the return after the tax authority takes its share. A gain that looks like ten percent on paper might, after tax, be meaningfully less in your hands — and that smaller figure is the only one that funds your future.
Stack the two together and the famous number shrinks dramatically. A nominal ten percent, minus several points of inflation, minus a slice of tax, can leave a real, after-tax return that is a fraction of where you started. Nothing was stolen and no one lied — the two largest costs were simply never mentioned in the headline.
Why the flattering number survives
If the real, after-tax figure is what matters, why is the gross nominal one the one everybody quotes?
Partly because it is bigger, and bigger numbers are more appealing to repeat, to advertise, and to believe. Partly because inflation and tax are variable and personal, so the gross figure is the only one that can be stated cleanly to everyone at once. And partly because the gap is invisible in the moment — you see the headline return on a chart, while inflation and tax do their work quietly, spread across years and buried in unrelated transactions. The comfortable number is the one that gets passed around precisely because it is comfortable.
What this is not
This is not an argument that investing is futile, or that long-term returns are an illusion — real, after-tax returns over long periods have still, historically, built genuine wealth, which is the actual case for investing. It is not advice about any particular investment, account, or tax strategy; those depend on your situation. It is one correction: that the number you are most often quoted is the one most likely to mislead you, because it omits the two largest deductions between a gain on paper and a gain in your life.
The question to keep
So the next time you are quoted a return — on a fund, a strategy, a market, an opportunity — do not let the gross nominal figure set your expectations. Run it through the two bites that the headline left out:
After inflation has taken its share, and after tax has taken its share, what did this actually earn me — in money that buys real things, in a world where prices rise and the tax authority is a silent partner in every gain?
We are not here to tell you whether to invest or what to choose. We are here to make sure you judge every return by the only figure that ever reaches you: what’s left after the two costs nobody puts in the headline.
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