Historical Index Fund Returns: What to Expect
Yes, the S&P 500 has averaged roughly 10% a year — but it got there through 50% crashes and decade-long flat spells. Here's what the history of index returns really looks like.
Don't have time? Here's what you need to know:
- 1The S&P 500 has returned roughly 10% a year nominally long-term (about 7% after inflation), but almost never 10% in any single year.
- 2That average was earned through ~50% drawdowns in 2000-2002 and 2007-2009 and a ~34% drop in early 2020 — all eventually recovered.
- 3Over rolling 20-year periods, U.S. stock returns have historically been positive, which is why index funds suit long horizons.
- 4Past returns don't guarantee the future; plan for volatility, keep a long horizon, and don't anchor to a precise number.
The Famous ~10% Average, and What It Hides
Over the long run, the S&P 500 has returned roughly 10% a year nominally with dividends reinvested — the figure quoted in nearly every discussion of index investing. Adjusted for inflation, the real return has been closer to 7% a year. Those numbers are accurate over multi-decade horizons, and they are the foundation of the case for buying and holding a broad index fund.
But the average is a destination, not the journey. The market almost never returns 10% in an actual calendar year. Annual returns are wildly scattered around that mean — some years up 25% or 30%, others down 20% or more. The smooth long-run number is the product of decades of jagged, unpredictable years, and treating it as a reliable annual yield is the most common way investors misjudge what index funds do.
The Drawdowns You Have to Survive
The 10% average was earned only by investors who endured brutal declines along the way. The S&P 500 fell roughly 50% from its 2000 peak through the 2002 bottom in the dot-com bust, and again about 57% from its 2007 peak to the 2009 financial-crisis low. The 2020 COVID crash cut the index by about a third in a matter of weeks. Each time, the market eventually recovered and went on to new highs — but only for those who did not sell at the bottom.
There have also been long flat stretches that test patience. An investor who bought at the 2000 peak waited well over a decade just to get back to even in price terms. History strongly favors the patient index holder, but "patient" can mean tolerating years of pain. Understanding this in advance is what separates investors who capture the long-run return from those who panic-sell and lock in a loss.
| Episode | Approx. S&P 500 decline | Outcome |
|---|---|---|
| Dot-com bust (2000-2002) | ~-50% | Recovered by mid-2000s |
| Financial crisis (2007-2009) | ~-57% | Recovered, new highs followed |
| COVID crash (early 2020) | ~-34% | Recovered within months |
Important: Every major drawdown felt permanent at the time. The investors who earned the ~10% average are the ones who kept buying through the fear, not the ones who waited for the 'all clear.'
Why Your Time Horizon Changes the Odds
The longer you hold a broad index fund, the more reliable its return becomes. Over any single year the range of outcomes is enormous, from steep losses to large gains. Over rolling 20-year periods, U.S. stock returns have historically been positive in every window, even ones that included the worst crashes — because the strong years more than offset the bad ones given enough time.
This is the core reason index funds are framed as long-term vehicles. Money you might need in two or three years has no business in an S&P 500 fund, because a downturn could arrive precisely when you need to withdraw. Money you will not touch for decades is where the index's historical strength shows up. Matching your time horizon to the asset is the single most important risk decision an index investor makes.
Tip: Match the holding period to the goal. Stocks for money you won't need for 10+ years; bonds or cash for money you'll need soon. The ~10% average only shows up over long horizons.
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What to Realistically Expect Going Forward
Past returns do not guarantee future ones, and it would be a mistake to bank on exactly 10% a year ahead. Valuations, interest rates, and economic growth all shape returns, and several respected forecasters expect more modest numbers over the next decade than the historical average. The honest position is that the long-run direction of a diversified index has been up, but the pace is genuinely unknown.
What you can reasonably expect is this: a broad index fund has historically delivered solid long-run growth to patient investors, punctuated by frightening but temporary declines. Plan for volatility, keep your time horizon long, contribute steadily through good years and bad, and do not anchor your plan to a precise return number. The behavior you bring to the index matters as much as the index's own returns.
Frequently Asked Questions
What is the average annual return of an index fund?
For a broad U.S. stock index like the S&P 500, the long-run average has been roughly 10% a year nominally with dividends reinvested, or about 7% after inflation. But that's a multi-decade average, not a typical single year — annual returns swing widely from large gains to steep losses, and the smooth average only emerges over long holding periods.
How often does the stock market actually return 10% in a year?
Rarely. The ~10% figure is a long-run average, and actual calendar-year returns are scattered widely around it — frequently up 20%+ or down 20%+, and only occasionally close to 10%. The average is the product of many uneven years, which is why it's misleading to expect 10% in any specific year.
How bad have index fund losses been historically?
Severe at times. The S&P 500 fell roughly 50% in the 2000-2002 dot-com bust, about 57% in the 2007-2009 financial crisis, and around 34% in the early-2020 COVID crash. Each time it eventually recovered and reached new highs, but the recoveries rewarded only investors who held on rather than selling at the bottom.
Are index fund returns guaranteed over the long term?
No. History shows broad index returns have been positive over every rolling 20-year period in the U.S. so far, but past results don't guarantee future ones. Returns depend on valuations, growth, and rates, and some forecasters expect more modest numbers ahead. Treat the long-run average as a guide, not a promise, and keep your time horizon long.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.