No 20-Year Period Has Ever Lost Money in the S&P 500
Rolling 10-year and 20-year annualized returns since 1930
Rolling 10-year S&P 500 total returns have been negative only a handful of times (after 1929, after 2000). Over any rolling 20-year period, the S&P 500 has NEVER produced a negative annualized total return. The worst 20-year return was approximately +6% annualized.
What history says
Editorial commentary written by ALAN analysts. Figures cited below are analyst-authored context — they are not derived from the chart above and may reflect different windows or sources.
Even including the Great Depression start, the worst 20-year S&P 500 total return was approximately +6% annualized. For any client with a 20+ year horizon, the historical floor is solidly positive.
The 2000-2009 decade was negative in real terms for the S&P 500. But 2000-2019 was solidly positive. Time horizon is the single most important variable in investment success.
Clients in accumulation (20+ year horizon) should see this chart annually. It provides mathematical certainty that patience has always been rewarded in US equities.
Segment your portfolio by time horizon and let the 20-year money be genuinely long-term: even history's worst 20-year stretch compounded positively, which argues for keeping distant-horizon dollars fully invested and reserving conservatism for money needed sooner.