Why Market Corrections Happen and How to React

A market correction is a fall of roughly 10% or more from a recent high. It often follows a shock, such as a rate surprise, weak earnings or geopolitical news, hitting a market made vulnerable by high valuations or borrowed money, though some large moves have no identifiable trigger. Reacting well comes down to a few rule-based checks: when the money is needed, whether the portfolio has drifted from its target, and what the tax and margin rules say about selling.

Key takeaways

"Correction" is a market convention; the SEC's Investor.gov glossary defines bear market (a fall of 20% or more over at least two months) but has no entry for correction.
From March 1957 to October 12, 2026, the S&P 500 closed at least 10% below its prior record 23 times, about once every three years; 12 stopped short of 20%.
"Most corrections recover within six months" holds only in hindsight: 11 of the 12 shallower declines regained their high within 126 trading days of the low, but from the first close 10% down, the only point visible in real time, 9 of all 23 did.
With bonds flat, a 15% stock fall moves a 60/40 portfolio to about 56/44, inside a 5-point rebalancing band.
Buying substantially identical securities within 30 days before or after a loss sale makes it a wash sale, which postpones the loss.

What counts as a correction

Market commentators use "correction" for a decline of 10% or more, usually less than 20%, in a broad index such as the S&P 500, measured from a recent closing high. The SEC's investor site has no glossary definition for the word; its Investor.gov definition of a bear market describes a fall of 20% or more in a broad index over at least two months.

A conventional threshold can split near-identical events. From January 27 to March 30, 2026, the S&P 500 fell 9.1% on a closing basis and is not counted as a correction; the 1967–68 decline of 10.1% is. This article measures declines as follows:

decline on day t = close(t) / highest close before t - 1

close(t)                 = index closing level on day t
highest close before t   = the running record close, reset each time the index sets a new high
correction (convention)  = decline of -10% or worse that ends above -20% at its lowest close

What tends to set one off

The Federal Reserve's framework for its Financial Stability Report separates shocks, which it calls inherently difficult to predict, from vulnerabilities, which can be monitored as they build up. The split is a useful lens for corrections: a shock often supplies the timing, and vulnerabilities help decide how far prices fall.

Shocks: the news that starts the move

A stock price reflects expected earnings and the rate used to discount them, so news that cuts expected earnings or raises rates lowers prices, other things equal. A study of newspaper coverage of market volatility by Baker, Bloom, Davis and Kost found commodities, interest rates, real estate, economic activity and inflation prominent, with about 30% of such articles discussing tax policy and 30% monetary policy. Geopolitics belongs here too: the Fed's May 2026 report notes that developments in the Middle East led to periods of heightened interest rate volatility.

News does not explain everything. In "What Moves Stock Prices?" Cutler, Poterba and Summers found that macroeconomic news explained no more than about a third of the variation in aggregate returns, and that large market moves often occurred on days with no identifiable major news. Post-drop headlines can imply a single cause the data do not support.

Vulnerabilities: why some drops go further

Valuation. The Fed's framework says elevated valuation pressures may increase the possibility of outsized drops in asset prices. In its May 2026 asset valuations section, the S&P 500 forward price-to-earnings ratio remained well above its historical median. That describes a condition, not a forecast of when or whether prices fall.
Liquidity. The same section notes that low liquidity can mean larger price moves after shocks, and that volatility can in turn reduce liquidity as liquidity providers quote more cautiously.
Leverage. Borrowed money turns falling prices into forced selling: brokers can sell margin borrowers' securities without notice, and the framework describes over-leveraged institutions forced to cut lending and sell assets after losses.

The record since 1957

The figures below are this article's own calculation from daily S&P 500 closes in Yahoo Finance's ^GSPC history, from March 4, 1957, the commonly reported launch of the 500-stock index, to October 12, 2026. Yahoo is a commercial data service, not an official record. The St. Louis Fed's FRED SP500 series carries only the last ten years; over that decade the two matched within 0.12% every day and gave the same five declines, but the 18 earlier declines rest on Yahoo alone. Dividends are excluded; with them reinvested, recoveries would come sooner.

The 12 declines that ended between 10% and 20% are listed here; "trading days" are days the market was open, and 126 is roughly six months.

Record close	Lowest close	Decline	Trading days to low	Trading days, low to old high	Old high within 126 days of low	Old high within 126 days of peak
Aug 3, 1959	Oct 25, 1960	-14.0%	311	64	Yes	No
Sep 25, 1967	Mar 5, 1968	-10.1%	110	37	Yes	No
Oct 10, 1983	Jul 24, 1984	-14.4%	199	125	Yes	No
Oct 9, 1989	Jan 30, 1990	-10.2%	78	82	Yes	No
Jul 16, 1990	Oct 11, 1990	-19.9%	62	86	Yes	No
Oct 7, 1997	Oct 27, 1997	-10.8%	14	28	Yes	Yes
Jul 17, 1998	Aug 31, 1998	-19.3%	31	59	Yes	Yes
Jul 16, 1999	Oct 15, 1999	-12.1%	64	22	Yes	Yes
May 21, 2015	Feb 11, 2016	-14.2%	183	103	Yes	No
Jan 26, 2018	Feb 8, 2018	-10.2%	9	137	No	No
Sep 20, 2018	Dec 24, 2018	-19.8%	65	81	Yes	No
Feb 19, 2025	Apr 8, 2025	-18.9%	34	55	Yes	Yes

For these 12, the median decline was 14.1%, the median time from record to low 64.5 trading days (about three months), and from low back to the old high 72.5 (about three and a half months). The other 11 declines went past 20%, with a median depth of 33.5%. Counted from the record close, they took a median of 488 trading days, about two years, to regain it; the longest, from January 1973 to July 1980, took 1,898 trading days, about 7.5 years.

Because the reference point is the running record close, a slide that starts below an earlier record is not counted separately: the 19.4% fall from April 29 to October 3, 2011 is absent because the index had not regained its October 2007 high. Methods that restart from interim highs find more corrections.

Checking the six-month claim

A common line holds that about 80% of corrections recover within six months. The answer depends on where the clock starts and which declines count.

Declines counted	Clock starts at	Back at old high within 126 trading days
12 that stayed between 10% and 20%	Lowest close	11 of 12 (91.7%)
12 that stayed between 10% and 20%	First close 10% below the record	8 of 12 (66.7%)
12 that stayed between 10% and 20%	Record close	4 of 12 (33.3%)
All 23 declines of 10% or more	Lowest close	13 of 23 (56.5%)
All 23 declines of 10% or more	First close 10% below the record	9 of 23 (39.1%)
All 23 declines of 10% or more	Record close	5 of 23 (21.7%)

The flattering 91.7% needs two facts nobody has in real time: that the decline will stop short of 20%, and where the low is. The only moment an investor can identify is the first close 10% below the record; from there, 11 of the 23 declines (47.8%) went on past 20%, and 9 of 23 regained the old high within about six months. With 23 events, one recovery more or less moves a share by about 4 percentage points (8 in the 12-decline rows), so these figures describe a small sample; they are not probabilities.

How to react: the rules that apply

None of this is a recommendation to buy, sell or wait; these are the rules that decide which responses are available and what they cost.

When the money is needed

The SEC's beginners' guide to asset allocation ties the right mix to time horizon and risk tolerance. The record shows why: the 11 declines that went past 20% took from 126 to 1,898 trading days, roughly six months to 7.5 years, to get from the record close back to it. The record close is the fair starting point because the low is known only afterwards. Money needed within that span is exposed in a way long-term money is not. For retirees drawing income, the order of returns adds sequence-of-returns risk.

Rebalancing back to target

Rebalancing, in the guide's terms, restores the original mix, either on a calendar (every six or twelve months, for example) or when an asset's weight moves more than a set amount. The guide says to consider transaction fees and tax consequences before choosing a method.

Illustrative example. A $100,000 portfolio targets 60% stocks and 40% bonds. Stocks fall 15%; bonds are flat in scenario A and down 5% in scenario B (sometimes both fall together).

stock weight after the move = S(1 + rs) / [S(1 + rs) + B(1 + rb)]
trade to restore target     = w* x total - stock value
new cash needed, no selling = (w* x total - stock value) / (1 - w*)

S, B   = starting stock and bond values;  rs, rb = their returns
w*     = target stock weight (0.60 here)

Item	Scenario A: bonds 0%	Scenario B: bonds -5%
Stocks after a 15% fall	$51,000	$51,000
Bonds	$40,000	$38,000
Total	$91,000	$89,000
Stock weight	56.0%	57.3%
Trade back to 60/40	Move $3,600 from bonds to stocks	Move $2,400 from bonds to stocks
Alternative: new cash into stocks only	$9,000	$6,000

A 15% stock drop moves the weight by only 4 points in scenario A. With a rule of rebalancing only when stocks leave a 55%–65% band, neither scenario would trigger a trade; with bonds flat, stocks would have to fall about 18.5% to reach 55%. In a taxable account, selling bonds at a gain can create a tax bill. The SEC guide's other two methods avoid a sale: buying the underweight asset with new money, as in the last row, or redirecting ongoing contributions to it. The Rebalancing Calculator can repeat this arithmetic for other targets and balances.

Tax-loss sales and the wash-sale rule

Selling a holding below its cost realizes a capital loss that can offset capital gains. Under IRS Publication 550, the loss is disallowed as a wash sale if, within 30 days before or after the sale, the seller buys substantially identical stock or securities, acquires them in a fully taxable trade, acquires a contract or option to buy them, or buys them for an IRA or Roth IRA. Whether securities are substantially identical depends on all the facts and circumstances; different companies' shares ordinarily are not.

Illustrative example. Fund shares bought for $20,000 are sold for $17,000, a $3,000 loss. If substantially identical shares are bought 10 days later for $17,500, the loss is disallowed and added to the new shares' cost: $17,500 + $3,000 = $20,500 basis, and the old holding period carries over. The loss is postponed, not erased. Without a wash sale the loss counts now, but the replacement's basis is its lower purchase price, so a later sale shows a larger gain; how much tax is saved overall depends on the rates that apply in each year.

Margin and liquidity

On a margin call, a brokerage firm can sell securities in the account without advance notice, choose which ones, and change its threshold at any time, so borrowed positions can be sold mid-decline whatever the owner intends. Checking cash needs and margin balances early shows whether a sale could be forced.

Pitches that follow a sell-off

FINRA's guide to avoiding fraud describes the tactics: "phantom riches" promises using words like "guaranteed" or "risk-free", claimed credentials, and false urgency that the window is closing. It suggests checking the seller's registration on BrokerCheck and talking to someone before investing. A pitch to recover correction losses with no risk is a phantom-riches promise, often paired with the other two.

What a correction does not signal

A correction is not a reliable recession signal. Comparing the 23 declines with the NBER's official recession dates, a business-cycle peak came in the same month as the index's record close or within the next 12 months in 9 cases (the 2000 decline only just, at 12 months). For the 12 declines that stayed under 20%, it happened in 3; the other 9, including 1997, 1998, 2015, both 2018 drops and 2025, have no NBER-dated recession starting in that window as of October 2026.

The dates also arrive late. The NBER's Business Cycle Dating Committee says its approach is retrospective and it tends to identify a peak a number of months after the fact, long after the market has moved. As of October 2026, the most recent NBER-dated peak and trough were February and April 2020.

Frequently asked questions

Is a correction measured on closing prices or intraday?

Both are used, and the choice can change the label. On closes, the 1990, 1998, 2018 and 2025 declines all stopped short of 20%. On intraday highs and lows from the same data, each exceeded 20%: about 20.2% from September 21 to December 26, 2018, and about 21.3% from February 19 to April 7, 2025.

Are corrections happening more often than they used to?

This count shows no clear trend. By the decade of their record close, the 23 declines split 2 for 1957–59, 4 in the 1960s, 1 in the 1970s, 4 each in the 1980s and 1990s, 2 in the 2000s, 3 in the 2010s and 3 so far in the 2020s. The low 1970s and 2000s counts partly reflect the method, which does not count declines inside long slumps separately.

Can losses inside an IRA or 401(k) be harvested?

No. Publication 550 says its rules on investment losses do not apply to investments held in IRAs, 401(k) plans and other qualified retirement plans. Buying substantially identical stock in an IRA within 30 days of selling it at a loss in a taxable account is itself a wash sale, and in that case the loss is not added to the basis of the IRA shares.

Does the wash-sale rule apply if a spouse buys the shares?

Yes. Publication 550 says it is also a wash sale when a spouse, or a corporation the seller controls, buys substantially identical stock in the same 61-day span, 30 days before through 30 days after the sale.

What happens to a capital loss larger than $3,000?

According to IRS Topic 409, net capital losses beyond capital gains can reduce other income by up to $3,000 a year ($1,500 if married filing separately). The remainder carries forward, figured with the carryover worksheet in Publication 550 or the Schedule D instructions.

A checklist for the next one

Write down when each portion of the money is needed; compare it with the 126 to 1,898 trading days (about six months to 7.5 years) that declines deeper than 20% have taken to regain their record.
Compare the current stock weight with the target and a band set in advance; with 60/40 and a 5-point band, nothing triggers until stocks fall about 18.5% with bonds flat.
Before any loss sale in a taxable account, list every purchase of the same or a substantially identical security in all accounts, including a spouse's, IRAs and any dividend reinvestments, from 30 days before to 30 days after.
Check margin balances and the broker's current maintenance requirement.
Treat any unsolicited promise of guaranteed or risk-free recovery as a red flag; look the seller up on BrokerCheck.