How often does the S&P 500 dip — and how deep?
If you hold index funds and keep some cash for the dips, one question matters more than any forecast: how often do dips actually happen, and how far do they usually fall? Seventy-six years of data give a surprisingly clear baseline for separating routine volatility from the moments that deserve a plan.
Since 1950, declines in the S&P 500 have arrived on a remarkably regular schedule. Here is each size of decline, how often it shows up — and, more to the point, what it should mean to a long-term investor:
Background noise. They happen about once a year and pass in weeks. React to every one and you'll never stay invested. Ignore.
The market's most common meaningful discount. 26 of them since 1950, and the S&P recovered from each in about a year. Start paying attention.
The real ones — averaging about 35% deep and scary while they last. Yet all 11 since 1950 fully recovered. This is when a pre-planned cash rule matters.
Generational events — 2008, the COVID crash. Only 6 in 76 years. In hindsight, they produced exceptional long-term entries, but they were emotionally hardest in real time. Act from a plan, not panic.
A typical correction (≥10%)
Median depth around 20%. Roughly 8 months from peak to trough, then about a year back to a new high.
A bear market (≥20%)
Average depth around 35%. About 14 months down, and roughly two years to fully recover.
The deepest declines since 1950:
| 2007–09 — Global Financial Crisis | −56.8% |
| 2000–02 — Dot-com bust | −49.1% |
| 1973–74 — Oil shock | −48.2% |
| 2020 — COVID crash | −33.9% |
| 1987 — Black Monday | −33.5% |
Here is the part most investors get wrong. The market is not usually sitting at an all-time high. Since 1950, the S&P 500 has spent about 35% of all trading days at least 10% below its prior peak — and 16% of days at least 20% below.
A third of the time, in other words, the index is trading below a prior peak by enough to feel uncomfortable. Buying the dip is not mainly about catching a rare crash. It is about deciding in advance how you will behave during normal market weather, then having a rule that keeps you from improvising under stress.
You can't know the exact day in advance — nobody can, and anyone who claims otherwise is selling something. What you can do is stop guessing and use a rule. A good signal doesn't predict the future; it waits for evidence that selling pressure has exhausted itself, then flags it.
Since 2016, our DoubleTrends™ signal has fired 12 times on the S&P 500 index. At the moment each one fired, the market was a median of 13.2% below its recent peak. The deepest signals landed near the COVID crash low (−22.3%) and the 2022 bear-market low (−23.3%). To be straight with you: not every signal marked a major bottom. Several fired on shallow 5–8% dips that barely qualified as corrections, and some were early. The point is not that every alert is a generational buy; it is that the same rule was present when the largest opportunities appeared.
One of our tools, the Maximum Drawdown indicator, takes a different angle. Instead of reading price patterns, it counts how many of the past months' closing prices were higher than today's. When that count is high, today's price sits near the bottom of its own recent history — the accumulation zones that, in hindsight, were the good entries. It's a simple, honest way to ask one question: relative to where this market has been, how cheap is it right now?
Let the signal watch for you.
DoubleTrends™ tracks the S&P 500 index every day and sends a single alert when the oversold-reversal rule fires — built for ETF investors using funds such as VOO, SPY, or IVV. It does not replace allocation decisions, but it gives you a dated reference point when the market is hardest to read.
SubscribeData & method
S&P 500 price index (^GSPC) daily closes since 1950, via Yahoo Finance. Drawdowns are price-only and exclude dividends, so real total-return recoveries were somewhat faster than the figures above. A “decline” is measured from an all-time high to the lowest point before a new all-time high is reached. Signal drawdowns are measured on the S&P 500 index itself from 2016 to present. Educational information only — not financial, investment, or trading advice. Past performance does not guarantee future results.