Real vs. Nominal Return: What Investors Need to Know
The nominal return is the headline return your investment earns. But inflation silently erodes purchasing power every year. The real return — calculated using the Fisher equation — tells you how much your wealth actually grew in terms of what you can buy.
If inflation is 3% and your nominal return is 7%, the simple approximation gives 4%, but the precise Fisher calculation gives 3.88%. The difference becomes significant at higher rates. When inflation exceeds your nominal return, the real return is negative — your money buys less than before despite earning a positive return.
Frequently Asked Questions
Simple subtraction (nominal − inflation) is a rough approximation. The Fisher equation is mathematically precise and accounts for the compounding interaction between nominal returns and inflation. At higher rates, the approximation error grows.
Historically, US equities (S&P 500) have delivered ~7% real returns over the long term. Real estate, TIPS (Treasury Inflation-Protected Securities), and commodities also serve as inflation hedges.