Real vs. Nominal Returns: What Your Investments Earn After Inflation
October 21, 2026
A nominal return is the percentage your investment grows before accounting for inflation. A real return measures your growth in purchasing power. The exact formula is real return = (1 + nominal) / (1 + inflation) − 1. With a 7% nominal return and 3% inflation, the real return is 1.07 / 1.03 − 1 ≈ 3.88%, slightly less than the 4% you get by simple subtraction.
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Starting with $10,000 and earning 7% a year for 30 years gives about $76,123 in nominal terms. But if inflation runs at 3%, prices are about 2.43 times higher after 30 years, and the same money is worth about $31,361 in today's purchasing power.
That is a very different number from the headline figure, and it is the figure that matters when you plan a retirement budget in today's dollars.
| Years | Nominal value at 7% | Real value (3% inflation) |
|---|---|---|
| 10 | $19,672 | $14,637 |
| 20 | $38,697 | $21,426 |
| 30 | $76,123 | $31,361 |
The Approximation and When It Breaks Down
Subtracting inflation from the nominal return (7% − 3% = 4%) is close enough at low rates. At higher inflation, the error grows. With a 12% nominal return and 8% inflation, the exact real return is 1.12/1.08 − 1 ≈ 3.70%, not 4%.
Use the exact formula for long projections, because small errors compound across decades.
Using Real Returns in Planning
Retirement tools often ask for either a nominal return with an inflation rate or a real return directly. If you enter a nominal return and ignore inflation, projected balances look larger than the purchasing power they will actually have.
A simple habit is to run projections in real terms: use a real return such as 4% and express all future amounts in today's dollars.
Frequently Asked Questions
What is the formula for real return?
Real return = (1 + nominal return) ÷ (1 + inflation rate) − 1. The shortcut of nominal minus inflation is a close approximation at low rates.
Why is real return lower than nominal return?
Inflation reduces the purchasing power of each dollar, so a positive inflation rate always makes real growth smaller than nominal growth.
Can a real return be negative?
Yes. If inflation exceeds your nominal return, as with a savings account paying 1% when inflation is 3%, you lose purchasing power even though the balance grows.
What inflation rate should I assume for planning?
Many planners use 2% to 3% for long-run projections, but actual inflation varies by year. Testing a higher scenario is wise.