The headlines are alarming. Your portfolio is down 25%. Experts are predicting further drops. Friends are talking about selling. The feeling that you should DO something is overwhelming.
Here's what 100 years of stock market data says you should do: almost nothing.
The investors who build the most wealth through market crashes are almost uniformly the ones who stayed invested, kept contributing, and did not sell. The investors who suffer the most are the ones who respond to crashes as emergencies and sell at the worst moment.
Disclaimer: This article provides general investment principles. Your specific situation depends on your timeline, asset allocation, and financial needs. Consider your circumstances carefully before making any investment decisions.
What a Market Crash Actually Is
A bear market is defined as a decline of 20%+ from a recent high. A market correction is a 10–20% decline.
Both feel catastrophic when you're in them. Both have always been temporary.
Historical S&P 500 bear markets:
| Period | Peak Decline | Duration | Recovery Time | |---|---|---|---| | 1973–1974 | -48% | 21 months | ~7 years | | 2000–2002 (dot-com) | -49% | 30 months | ~7 years | | 2007–2009 (financial crisis) | -57% | 17 months | ~5.5 years | | 2020 (COVID) | -34% | 1.5 months | ~5 months | | 2022 (rate hikes) | -25% | 9 months | ~18 months |
Every single bear market in US stock market history has been followed by a full recovery and new all-time highs. The question has never been "will it recover?" — only "how long will it take?"
The Most Expensive Mistake: Selling at the Bottom
The problem with selling during a crash is that you must then decide when to get back in. And the data shows that investors who sell during crashes almost never get back in at the right time.
Example: The 2009 Bottom
- S&P 500 bottom: March 9, 2009 (lowest point)
- Investor who sold in fear: sat in cash
- One year later (March 2010): S&P 500 was up 69% from the bottom
- Investor who sold: missed the entire recovery
| Action | 5-Year Result (from 2009 bottom) | |---|---| | Stayed invested throughout | +240% | | Sold at bottom, returned 6 months later | +155% | | Sold at bottom, returned 1 year later | +130% | | Sold at bottom, never returned | +0% |
Selling at the bottom and missing even 6 months of recovery cost 85 percentage points of return.
What the Data Says About Market Timing
Market timing — selling before a crash and buying back before the recovery — sounds logical. The data shows it almost never works:
DALBAR Research: The average equity fund investor earned 4.25% per year over 20 years — while the S&P 500 returned 9.52%. The gap is entirely explained by investors buying at peaks and selling at troughs.
JP Morgan study: Missing the 10 best trading days of each decade dramatically reduces returns.
| Scenario | $10,000 invested in S&P 500 (1994–2024) | |---|---| | Fully invested for 30 years | ~$210,000 | | Missed the 10 best days | ~$96,000 | | Missed the 20 best days | ~$57,000 | | Missed the 40 best days | ~$21,000 |
The best trading days often occur in the middle of bear markets — right when fear is highest and most investors have sold.
What You Should Actually Do During a Crash
Step 1: Verify your time horizon hasn't changed.
If you're 35 and invested for retirement at 65, a market crash changes nothing about your 30-year horizon. The portfolio is on paper, not in your wallet. A 30% paper loss on an account you won't touch for 25 years is noise, not a crisis.
If you're 63 and need to withdraw in 2 years — that's a different situation that should have been addressed by reducing stock exposure before the crash.
Step 2: Check your asset allocation, not your balance.
The question isn't "how much have I lost?" — it's "is my allocation still appropriate for my timeline and risk tolerance?"
| Portfolio Loss During Crash | What It Might Indicate | |---|---| | -10% during -30% crash | Under-allocated to stocks (possibly appropriate) | | -25% during -30% crash | Normal; well-diversified equity portfolio | | -45% during -30% crash | Over-allocated to volatile assets |
If a 25% portfolio drop causes you physical anxiety and the urge to sell everything, your allocation is too aggressive for your psychology. That's a problem to fix after the recovery — not during it.
Step 3: If you have cash to invest, buy more.
A market crash is a sale on stocks. Every dollar you invest during a crash buys more shares than the same dollar invested at peak prices.
| Scenario | Monthly Investment | Period | Result | |---|---|---|---| | Only invested before crash | $500/month | 5 years | Good | | Continued investing through crash | $500/month | 5 years | Better | | Increased investment during crash | $700/month | 5 years | Best |
Warren Buffett's most famous advice: "Be fearful when others are greedy, and greedy when others are fearful." During crashes, others are maximally fearful.
Step 4: Don't look at your portfolio daily.
The psychological damage of watching a portfolio fall $5,000–$20,000 per week is enormous and serves no productive purpose. Check quarterly. Ignore the news cycle.
When Action IS Appropriate
Some situations during a crash warrant a response:
| Situation | Appropriate Response | |---|---| | Asset allocation too aggressive for timeline | Plan to rebalance gradually after recovery | | Need cash in next 1–2 years | Sell bonds/cash reserves first, not stocks | | Have cash you intended to invest | Invest it — lower prices are an opportunity | | Rebalancing time (annual) | Sell what's overweight, buy what's underweight | | Harvest tax losses | Sell a losing position to offset gains, immediately buy similar fund |
Tax-loss harvesting: If your S&P 500 fund is down 25%, you can sell it, immediately buy a similar (but not identical) fund (wash-sale rule: can't buy the exact same fund for 30 days), and realize the loss for tax purposes — while staying fully invested.
How to Mentally Prepare Before the Next Crash
The best time to prepare for a crash is before it happens.
1. Know your allocation and why it's appropriate for your timeline. Write it down. When the crash comes, you can refer back to your reasoning rather than your emotions.
2. Set a "do nothing" rule for 6 months after a crash. Commit in advance: if the market falls 20%+, you will not sell for 6 months minimum. Write it down.
3. Turn off financial news during crashes. Financial media profits from fear. Their job is to keep you watching — not to help you invest well.
4. Have 1–2 years of expenses in cash or bonds (if near retirement). Retirees or near-retirees should maintain a cash/bond buffer specifically so they don't need to sell stocks during crashes. This is called the "bucket strategy."
Historical Perspective: What Crashes Feel Like vs. What They Are
| At the Time | In Retrospect | |---|---| | "The market will never recover" | Every one has recovered | | "This time is different" | It never is, structurally | | "I should wait for certainty" | Certainty arrives when stocks are already up 50% | | "This is a fundamental collapse" | Usually a confidence crisis, not permanent destruction of value |
Every generation of investors experiences a crash that feels uniquely catastrophic. Every one of those crashes has been followed by recovery.
The Bottom Line
A stock market crash is the most important test of every investor's discipline. The investors who pass it — by staying invested, continuing contributions, and maybe buying more — emerge with significantly more wealth than those who respond to the emotional emergency by selling.
The correct action during a crash for a long-term investor is: nothing. Or if you have extra cash: buy more. The fear you feel during a crash is real. The permanent damage it implies is not.