Real return

A real return is the return on an investment after adjusting for inflation. While a nominal return measures the change in the dollar value of the investment, a real return measures the change in what those dollars can actually buy. Real return is the figure that matters for long-term planning because it represents actual growth in purchasing power.

How it’s calculated

The exact formula relates real and nominal returns through inflation:

Real return = ((1 + nominal) / (1 + inflation) − 1) × 100

For practical purposes at low rates, the shortcut real ≈ nominal − inflation works well. A 7% nominal return with 3% inflation gives a real return of approximately 4% (precisely 3.88%). A 5% nominal return with 4% inflation gives only about 1% real. A 3% nominal return with 4% inflation produces a negative real return — the investment is losing purchasing power.

Why it matters

Inflation compounds against the real value of an investment in the same way returns compound for it. Over short horizons, the gap between nominal and real returns is small. Over long horizons it becomes dramatic:

• At 3% inflation, prices double every ~24 years.
• A $1 million nominal balance in 30 years has the purchasing power of about $412,000 today.
• A 30-year retirement projection at 8% nominal / 3% inflation is really only a 4.85% real-return projection.

This is why financial planners insist on projecting in real terms. Nominal numbers always feel reassuring and always overstate the lifestyle they support.

Historical context

Long-run nominal stock-market returns in developed markets have averaged around 8–10%. Long-run inflation in those same economies has averaged 2–4%. So the long-run real equity return — the actual growth in purchasing power — is typically 5–7%. This is the figure most academic studies and prudent financial advisers use when discussing long-term returns.

How real return shapes decisions

Once an investor thinks in real terms, several reframes follow naturally:

• Cash savings reveal their true cost. A 2% savings account at 3% inflation is losing real value at 1% per year.
• The “safe withdrawal rate” makes more sense. The classic 4% rule is a real-terms figure — meaning 4% inflation-adjusted, not 4% of the nominal balance.
• Bond yields look different. A 4% bond in a 4% inflation environment returns nothing in real terms.

Real return is one of the most important — and most underused — concepts in personal investing. Every long-horizon projection should be expressed in real terms before being acted upon.