A calm, ordered checklist for the days when stocks are falling hard: what to check first, what to leave alone, when rebalancing and tax‑loss harvesting help, and how long past crashes took to recover. With a market risk check that updates every trading day.
Work through a short checklist in a fixed order, and act only where it says so. Most lasting crash damage comes from a decision made on the worst day: selling at the low, or freezing when a plan called for rebalancing. The order below puts the questions that matter most first. It is part of the portfolio protection guide.
Data through the close of Oct 20, 2026. The S&P 500 fell 1.2% over the last five trading days, and the Nasdaq‑100 fell 3.5%. The S&P 500 is 1.3% below its record close of Oct 6: a small dip from its record. It is 6.4% above its 200‑day average (+7.9% a week earlier). Its 20‑day volatility is 9.4% a year, calmer than 71% of trading days since 2016.
Daily closes over the last year, through Oct 20, 2026. Green: the index above its average; red: below it.
Through Oct 20, 2026. “vs 200‑day avg.” = how far the close sits above or below its 200‑day average.
| Index fund | Last 5 days | Year to date | From its high | vs 200‑day avg. |
|---|---|---|---|---|
| S&P 500 (SPY) | −1.2% | +13.1% | −1.3% | +6.4% |
| Nasdaq‑100 (QQQ) | −3.5% | +17.0% | −5.5% | +6.8% |
| Russell 2000 (IWM) | −0.3% | +12.2% | −9.6% | −0.3% |
| Index fund | S&P 500 (SPY) | Nasdaq‑100 (QQQ) | Russell 2000 (IWM) |
|---|---|---|---|
| Last 5 days | −1.2% | −3.5% | −0.3% |
| Year to date | +13.1% | +17.0% | +12.2% |
| From its high | −1.3% | −5.5% | −9.6% |
| vs 200‑day avg. | +6.4% | +6.8% | −0.3% |
Last updated Oct 20, 2026. Members only.
| Exent regime pillar | Today |
|---|---|
| Liquidity | |
| Credit stress | |
| Economic cycle | |
| Sentiment | |
| Regime: Risk ON · Neutral · Risk OFF |
Price trend and volatility show what the market has already done. Exent’s macro regime score reads the backdrop behind it (liquidity, credit stress, the economic cycle and sentiment) and classifies it as Risk ON, Neutral or Risk OFF. Market intel members see today’s reading and get an alert when it changes.
Rarely, because the biggest up days tend to come within days of the biggest down days. In Exent’s data (Jul 2016 – Sep 2026), 8 of the S&P 500’s 10 best days came within 10 trading days of one of its 10 worst. On March 16, 2020 the S&P 500 fund fell 10.9%; on March 17 it rose 5.4%. In April 2025 the two worst days of the tariff selloff, April 3 and 4, were followed three trading days later by the best day since mid‑2016.
That selloff took the S&P 500 down more than 12% in the seven days after the April 2 tariff announcement, and the index had largely returned to its pre‑announcement level about a month later, NBC News reported on Yahoo Finance. Waiting a day or two costs little in a fall that size. A sale at the low can cost the rebound. Many investors traded anyway: 401(k) trading in that selloff ran at almost 10 times a normal day, the highest since March 2020, with money moving into stable value, bond and money market funds, Yahoo Finance reported, citing Alight.
Check this before any decision to sell. Money you will spend within 2–3 years, such as a home purchase, tuition or retirement withdrawals, has no time to recover. If that money already sits in cash or T‑bills, the crash in the rest of the portfolio is a paper loss with time to heal. If it is still in stocks, one approach is to move it gradually rather than all on one bad day.
Retirees drawing income can take withdrawals from cash or bonds during a fall and leave stocks alone until they recover. More on the first days after a fall: what to do after a big drop.
Look at your real exposure, not the fund names. Three things make a portfolio fall further than the market: leverage (2× and 3× funds, margin loans), high‑beta holdings that move more than the index, and concentration in one stock or sector. In the COVID crash, a 2× S&P 500 fund (SSO) fell 59.3% and a 3× Nasdaq‑100 fund (TQQQ) 69.9%, against 33.7% for the S&P 500 fund (Exent’s data).
A quick test takes ten minutes: list your holdings, mark the leveraged and single‑stock positions, and add up what share of the portfolio they are. Margin loans deserve a separate line, because a broker can sell for you at the low. If those positions are larger than you can hold through another leg down, that is a decision for your plan, made on a calm day.
A written plan says what loss triggers a change, how much to cut or add, and what brings you back. If you don’t have one, the steps below are a common core; see how to write a market crash plan and drawdown rules.
Rebalancing bands. A crash pushes a portfolio away from its target mix. A common approach is a band, such as 5 percentage points either side of the target, with a rebalance only when a band is crossed (rebalancing band). Illustrative, a $1,000,000 portfolio with a 60% stock target:
| Illustrative | Stocks | Bonds and cash | Stock share |
|---|---|---|---|
| Before the fall | $600,000 | $400,000 | 60% |
| Stocks fall 25%, bonds flat | $450,000 | $400,000 | 53% |
| Rebalance back to 60% | $510,000 | $340,000 | 60% |
Rebalancing buys stocks after they fall, by rule rather than by nerve. It only works if the bond and cash side held up, which is why the mix matters before the crash.
Tax‑loss harvesting. In a taxable account, selling a holding below its cost realizes a loss that can offset capital gains and up to $3,000 a year of other income, with the rest carried forward (IRS Topic 409). The wash‑sale rule disallows the loss if you buy the same or a substantially identical security within 30 days before or after the sale, as Fortune explained on Yahoo Finance during the April 2025 selloff. A common workaround is to swap into a similar but not identical fund, to stay invested. See tax‑loss harvesting.
Every S&P 500 decline of 10% or more since mid‑2016 got back to its old high, but the wait ran from about four months to two years. The four big selloffs:
| Selloff | S&P 500 peak | Trough | Fall | Back to the peak |
|---|---|---|---|---|
| Q4 2018 selloff | Sep 20, 2018 | Dec 24, 2018 | −20.2% | Apr 29, 2019 |
| COVID crash, 2020 | Feb 19, 2020 | Mar 23, 2020 | −34.1% | Aug 18, 2020 |
| 2022 bear market | Jan 3, 2022 | Oct 12, 2022 | −25.4% | Jan 19, 2024 |
| 2025 tariff selloff | Feb 19, 2025 | Apr 8, 2025 | −19.0% | Jun 27, 2025 |
Every decline of 10% or more, from peak to recovery. Counting smaller dips, the index fell 5% or more from a high 13 times in the period, these five included:
| Peak | Trough | Fall | Back to the peak | Trading days, peak to recovery |
|---|---|---|---|---|
| Jan 26, 2018 | Apr 2, 2018 | −10.2% | Aug 24, 2018 | 146 |
| Sep 20, 2018 | Dec 24, 2018 | −20.2% | Apr 29, 2019 | 150 |
| Feb 19, 2020 | Mar 23, 2020 | −34.1% | Aug 18, 2020 | 126 |
| Jan 3, 2022 | Oct 12, 2022 | −25.4% | Jan 19, 2024 | 513 |
| Feb 19, 2025 | Apr 8, 2025 | −19.0% | Jun 27, 2025 | 89 |
The recovery math explains why deep falls take so long. A loss needs a larger gain to get back to even:
| Fall | Gain needed to get back to even |
|---|---|
| −10% | +11% |
| −20% | +25% |
| −34.1% (S&P 500, 2020) | +52% |
| −50% | +100% |
| −80% | +400% |
More in loss recovery math and how long crashes take to recover. If you sold during the fall, see when to get back into the market.
Work through a checklist in order: avoid deciding on the worst day, check money needed in the next 2-3 years, check leverage and concentration, follow your written plan, rebalance within bands, and harvest losses in taxable accounts.
Selling everything during a fall has a poor record because the best days cluster near the worst ones. On March 16, 2020 the S&P 500 fund fell 10.9%, and the next day it rose 5.4%.
A 10% fall is common: from mid-2016 to September 2026 the S&P 500 had 13 declines of 5% or more, five of them 10% or more, in Exent’s data. Each 10% decline got back to its old high, though the 2022 one took about two years.
A common approach is to rebalance when the stock share drifts outside a set band, such as 5 points from target. After a 25% fall in stocks, a 60/40 portfolio drifts to about 53/47, and rebalancing buys stocks back to 60%.
You sell a holding below its cost in a taxable account to realize the loss, which offsets gains and up to $3,000 a year of other income. Buying the same or a substantially identical security within 30 days before or after the sale disallows the loss.
Since mid-2016, the S&P 500 took between 89 and 513 trading days from peak to a new high in each decline of 10% or more. The 2020 crash took 126 trading days; the 2022 bear market took 513.
Market Intelligence reads the market regime and tells you whether the backdrop favors taking risk or protecting capital.
Educational content, not investment advice. Examples are illustrative; past performance does not guarantee future results.