What to do when the stock market crashes: a calm decision sequence

Why should you pause first when the stock market crashes?

A crash produces fast prices and slow facts. In the first hours, headlines repeat, screens turn red, and every message sounds urgent. A pause of 24 hours lets facts catch up with prices. During that time you make no trade except the ones your written plan already lists. The pause costs little, and it removes the most common mistake of the first day.

Use the pause to write down three things: the date, your portfolio value, and how you feel. The note gives you a baseline for the week. It also shows later whether you acted on information or on emotion. A written baseline turns a feeling into data, which is the first step toward a decision you can defend.

How do you check cash and income when the stock market crashes?

Step 2 is a count of what you can spend without selling investments. List the emergency fund, the next 6 months of bills, and any income at risk. If the reserve covers the bills, you can hold your shares through the fall. If it does not, you have a liquidity question to solve before an investment question.

Step 3 is the same count for income. A salaried job in a stable sector gives you time. A variable income, a business, or a loan with a margin clause gives you less. Income risk decides how long you can wait, so write the number of months next to the date from step 1. Liquidity questions come before investment questions, because cash needs set the clock for everything else.

What should your written plan say when the stock market crashes?

Step 4 is to open the plan you wrote in a calm period. It should state your target mix of stocks, bonds, and cash, your rebalancing rule, and the amount you add each month. If you have no plan, write one now on a single page, using the targets you held last month. The plan you wrote before the fall is the best guide during it.

Check each line against what changed. Prices moved, but your goals, your time frame, and your income may not have. When a line still fits, keep it. When a line no longer fits, note why, and change it only after the pause is over. A structured method for decisions under uncertainty makes that review faster.

Which facts matter most when the stock market crashes?

Step 5 sorts information into three piles: what is measured, what is argued, and what is rumour. Measured facts are prices, volumes, interest rates, and company announcements. Argued facts are forecasts and opinions. Rumour is anything without a source and a date. Only the measured pile deserves a trade, and only if it changes your plan.

Ask of each item: does it change my cash, my income, or my time frame? If the answer is no, the item is noise for your decision, however loud it is. Fewer checks give you the same facts with less stress. Limit news checks to two fixed times a day, for example after breakfast and before dinner. Fewer checks give you the same facts with less stress, and they protect your sleep.

How do rebalancing and steady buying work when the stock market crashes?

Step 6 is to act only through rules. A rebalancing rule sells what rose and buys what fell until the mix returns to target. A steady-buying rule adds the same amount each month, so a lower price buys more shares. Contributions and withdrawals can do part of the rebalancing without extra trades, which lowers cost. Both rules are written in the plan, so no judgement is needed on the day.

Rules work because they remove the question of timing. You do not need to call the bottom; you need to follow the schedule. A rule applied monthly beats a perfect trade attempted once. If a rule triggers a purchase that frightens you, reduce the size and keep the rule alive. A smaller step that you repeat is worth more than a large step that you skip, and the schedule stays intact for the recovery.

How should you review your decisions after a stock market crash?

Step 7 happens 30 days later. Reopen the baseline note and compare what you did with what the plan said. List each trade, the rule behind it, and the result. Note any trade without a rule. Every trade without a rule is a lesson for the next version of the plan.

Then update the plan once, in writing, with the date. Add the question that surprised you most, whether it was liquidity, income, or the pace of the fall. A plan that improves after each stress is stronger than one that never met stress. Keep the old version so you can see how your thinking moved. After two or three stress periods, the file becomes a personal record of what works for you.

How can EQOS Asia help you test choices when the stock market crashes?

The EQOS Asia Λ simulator shows each option in three settings: a soft landing, a correction, and a crash. You enter your choice, and you read the outcome before any money moves. That order keeps decisions on paper while emotions run high.

A 30-minute pre-diagnostic applies the same scoring to your own exposure in Singapore, ASEAN, or Hong Kong. You bring the decision and the numbers from steps 1 to 3, and the session returns a score and a ranked set of options. Review the EQOS Asia method first if you want to see how the score is built.

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About the author

Stéphane Jambu

President, EQOS Forecast Asia

Stéphane Jambu leads EQOS Forecast Asia and works as a consultant in e-commerce, search visibility, and AI. LinkedIn profile