The Selloff Playbook: what to do when the market drops

Every market drop feels like the exception — the one that keeps going. That feeling is the whole problem. The drops are normal; the damage is optional, and almost all of it is self-inflicted in the first 72 hours.

Declines of 10% or more show up in most years. Deeper falls of 20% or worse arrive every handful of years, driven by whatever the cycle’s headline happens to be — a war, a rate scare, a bank, a bubble. And historically, broad, diversified markets have gone on to make new highs given enough time. The investors who get hurt aren’t the ones who lived through the drop. They’re the ones who sold into it and bought back higher, converting a paper dip into a permanent loss.

So this playbook isn’t about predicting the bottom — nobody can, and anyone selling you a forecast is selling you something. It’s about behavior: a fixed sequence you run when the screen is red, so panic doesn’t get a vote. Steps, scripts, a checklist, a worked example, and the six ways people blow themselves up.

Why a drop hijacks your brain

Losses register roughly twice as hard as equal-sized gains feel good — a quirk called loss aversion — and a falling portfolio reads to your nervous system like a physical threat. That’s why a 15% dip can trigger the urge to “just get to safety,” even when nothing about your actual life has changed. Add an app you can refresh every ninety seconds and a feed engineered for alarm, and you’ve got a machine for manufacturing bad decisions. The fix isn’t more willpower. It’s removing the decision from the moment of maximum fear.

Step 1 — The 48-hour rule

When the market is in free-fall, your first move is to make no irreversible move for 48 hours. No selling, no “just going to cash for a bit,” no doubling down on margin. You’re allowed to look (once), to write down how you feel, and to reread this list. That’s it.

The gap does one job: it separates the decision from the adrenaline. Most of the catastrophic selling in any crash happens in a compressed window of peak fear. Route around that window and you’ve already dodged the mistake that does the most damage. Put the rule in writing now, before you need it, and tell one person you’ve committed to it.

Step 2 — Run the three-question triage

After the pause, don’t ask “is the market going lower?” (unanswerable). Ask three questions you can actually answer:

1. Did my goals change? Is this money still for the same thing — retirement in 20 years, a house in five? If the goal is intact, today’s quote is noise.
2. Did my timeline change? When do you actually need to spend it? Cash you need inside 2–3 years shouldn’t have been in stocks to begin with; money you need in 10-plus years has time to recover. The drop is only an emergency if your timeline says so.
3. Did the businesses break, or just the prices? In a broad selloff, the same companies earn the same profits the week after as the week before — the market simply repriced fear. If you own an index fund, you own the economy, and the economy didn’t vanish because oil spiked or a headline landed.

If your honest answers are “no, no, just prices,” the correct action is almost always nothing — which is a decision, not a cop-out. This triage pairs naturally with a standing routine like the 15-minute market review: the calmer your normal cadence, the less a red day can bully you.

Step 3 — Pressure-test your real risk

A drop is a free audit of whether your portfolio was ever right for you. Two quick tests:

• The cash-runway test. Do you have 3–6 months of expenses in cash you can reach without selling a single share? If yes, you are not a forced seller — and forced sellers are the only ones a crash truly ruins. If no, that’s the real lesson of this drop, and job one once things settle.
• The sleep test. If this decline is costing you sleep, your stock allocation is too high for your true risk tolerance — not just today, structurally. The move is to dial down to a calmer mix after the panic passes, not to knee-jerk sell at the lows. Discovering your real risk tolerance is worth the tuition.

Step 4 — Rebalance by bands, not by mood

Here’s the one active move that reliably helps: rebalancing. When stocks fall hard, they drift below their target share of your portfolio — say a 70/30 stock/bond mix slides to 61/39. Selling some bonds to buy stocks back to 70/30 mechanically makes you buy low, with zero forecasting required.

Do it by bands, not feelings: pick a trigger — for example, rebalance whenever an allocation drifts 5 percentage points off target — and act only when it’s hit. Bands turn a terrifying judgment call (“should I buy this crash?”) into a rule you set on a calm day. If your finances already run on a system like the Money Operating System, this is just one more automated rule, not a heroic bet.

Step 5 — The opportunistic layer (optional, powerful)

Only once the boring, protective steps are done should you reach for upside. In rough order of safety:

• Keep buying the plan. If you invest every paycheck, a drop means your automatic contributions now buy more shares per dollar. The single best thing most people can do in a crash is not turn off the autopilot.
• Tax-loss harvesting (taxable accounts only). Selling a losing position and immediately buying a similar-but-not-identical one lets you bank a tax loss while staying invested. Mind the wash-sale rules — a spot where a pro or good software pays for itself.
• Deploy dry powder in tranches. Sitting on cash earmarked for investing? Put it to work in planned slices — say a third now, a third if the market falls another 10%, a third later — rather than dumping it all in trying to nail the low. You won’t catch the bottom. You don’t need to.

Notice what’s not on the list: concentrated bets on whatever’s falling fastest, options to “make it back,” or leverage. Crashes end careers through the downside, not the missed upside.

A worked example

Say you hold $100,000 at a 70/30 split — $70k stocks, $30k bonds — and stocks fall 20%. Your stock sleeve drops to $56k; the total is $86k, now roughly 65/35. Panic says “sell before it hits $70k.” The playbook says:

1. 48 hours: nothing. Reread the plan.
2. Triage: retirement in 18 years, no near-term need, businesses intact → goals and timeline unchanged, just prices.
3. Risk check: five months of cash in the bank → not a forced seller. Sleeping fine → allocation about right.
4. Rebalance: your 5-point band tripped (65 vs 70). Move about $4,300 from bonds into stocks to get back to 70/30 — buying shares roughly 20% cheaper than a month ago.
5. Opportunistic: your $1,000 monthly auto-invest keeps running and now buys more shares; you harvest a loss on one fund and rotate into a similar one.

You did almost nothing dramatic. That’s the point. When the market recovers — on its own schedule, not yours — the rebalance and the steady buying quietly turn the drop into a tailwind.

Six ways people blow themselves up

• Selling to “wait for clarity.” Clarity arrives after the rebound, not before. You’ll buy back higher.
• Going fully to cash. The exit feels great for a week; then you’re frozen, waiting for a re-entry that never feels safe. Time out of the market is the expensive part.
• Revenge trading. Trying to win it back fast with bigger, riskier bets is how a drawdown becomes a wipeout.
• Refreshing the app. Checking a falling portfolio ten times a day is self-harm with extra steps. Cut it to once.
• Catching knives on margin. Buying the dip is fine; buying it with borrowed money can force you to sell at the exact bottom.
• Abandoning the plan you wrote when calm. Your calm self is smarter than your scared self. Trust the document.

The one-page selloff checklist

• ☐ Pause — no irreversible moves for 48 hours.
• ☐ Triage: did goals, timeline, or the businesses actually change?
• ☐ Confirm 3–6 months of cash → am I a forced seller? (No = breathe.)
• ☐ Rebalance only if a band is breached.
• ☐ Keep automatic contributions ON.
• ☐ Consider tax-loss harvesting (taxable only, mind wash sales).
• ☐ Deploy any dry powder in planned tranches.
• ☐ Close the app. Revisit on your scheduled date.