The Big Picture: 10% Average Annual Return
Since 1926, the S&P 500 has returned approximately 10.3% per year on average (including dividends). Adjusted for inflation, the real return is about 7%. This single fact is the foundation of most retirement planning.
Returns by Decade
| Decade | Avg Annual Return | Key Events |
|---|---|---|
| 1980s | +17.6% | Reagan era bull market |
| 1990s | +18.2% | Dot-com boom |
| 2000s | −0.9% | Dot-com bust + 2008 crisis |
| 2010s | +13.6% | Post-crisis recovery |
| 2020s (so far) | +12.4% | COVID recovery, AI boom |
The Power of Staying Invested
Missing just the 10 best trading days over the past 20 years would cut your returns in half. Missing the best 30 days would turn a profit into a loss. This is why "time in the market" beats "timing the market" — the best days often come right after the worst days.
Dollar-Cost Averaging Works
Investing a fixed amount monthly (dollar-cost averaging) into an S&P 500 index fund has been one of the most reliable wealth-building strategies. Even someone who started investing right before the 2008 crash would have recovered and profited significantly by 2012.
What $500/Month Grows To
| Time Period | Total Invested | Value (10% avg) |
|---|---|---|
| 10 years | $60,000 | $102,000 |
| 20 years | $120,000 | $382,000 |
| 30 years | $180,000 | $1,130,000 |
| 40 years | $240,000 | $3,162,000 |
Use our passive income calculator to model your own investment timeline with custom contributions and expected returns.