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Nominal vs real returns

Nominal return is the headline number (‘your fund returned 10% this year’). Real return is what’s left after inflation (10% nominal − 3% inflation = 7% real). For long-term planning, real returns are the only number that matters because purchasing power, not dollars, is what funds your retirement.

Updated May 2026 · 4 min read
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Definition

Nominal return is the headline number (‘your fund returned 10% this year’). Real return is what’s left after inflation (10% nominal − 3% inflation = 7% real). For long-term planning, real returns are the only number that matters because purchasing power, not dollars, is what funds your retirement.

What it means

Investment marketing nearly always quotes nominal returns because they’re higher numbers. But $1,000 in 2055 doesn’t buy what $1,000 buys today — at 3% inflation, $1,000 becomes $400-500 of equivalent purchasing power over 30 years. The S&P 500’s famous “~10% historical return” is nominal; real (post-inflation) return is closer to 7%. For retirement-target calculations, planning around 7% real makes sure your projected balance maintains today’s buying power. The difference compounds painfully: $500/month at 10% nominal for 30 years = $1.13M (nominal); same at 7% real = $612K (in today’s dollars).

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Formula

real_rate ≈ (1 + nominal_rate) / (1 + inflation) - 1

Why it matters

Most retirement calculators default to nominal returns, producing big optimistic numbers that overstate real wealth. A retirement projection of “$2M at age 65” in 2055 might purchase what $800K-1M buys today — meaningfully less than the calculator suggested. The fix: input 7% (real) instead of 10% (nominal) into compound-interest tools, OR input 10% nominal and mentally divide the output by 2-3 for purchasing-power equivalent. The harder fix: stop using inflation-blind models for long-term planning.

Example

Nominal 10%, inflation 3%: real return = (1.10 / 1.03) - 1 = 6.8%. Over 30 years: $1 grows to $17.45 nominal, but only $7.61 in today’s purchasing power. Same $1, two very different stories.

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Frequently asked questions

Where do I get the inflation rate?

US BLS publishes monthly CPI; the long-run average is 2-3%. Recent years (2021-2024) ran 3-7% — well above historical. For long-term planning, 2.5-3% is reasonable; lower if you assume Fed is back in control, higher if you assume structural inflation.

Do investment returns include dividends?

Total return (the standard measure) includes both price appreciation and dividends reinvested. The S&P 500’s 10% historical figure is total return; price-only return is closer to 6-7%.

Should I plan around real or nominal returns?

Real returns for purchasing-power planning (retirement, college, anything 10+ years out). Nominal for short-term comparisons where inflation impact is small.

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