What is Correction?

A correction is a fall of at least 10%, but less than 20%, in the price of a stock, an index or a whole market, measured from its most recent peak. An index is a basket of shares tracked as one number, such as the S&P 500, which follows 500 large US companies. The peak is the highest closing level before the decline began. Once a fall reaches 20% or more, it is usually called a bear market instead. The 10% line is a convention used by journalists and analysts, not an official rule, but it is widely used.

Here is a hypothetical example with round numbers. Say you invest $10,000 in an index fund when its price is at a peak of $100 per share, so you own 100 shares. Over the following weeks the price falls to $88. The decline is $100 minus $88, which is $12, and $12 divided by $100 is 12%, so the fund is in a correction. Your holding is now worth 100 times $88, or $8,800. To get back to $10,000, the price must rise $12 from $88, and $12 divided by $88 is about 13.6%. A recovery always needs a larger percentage gain than the loss, because it starts from a smaller base. If the price had fallen to $80 instead, a 20% decline, the recovery would need a 25% gain.

The main limit is that the label only describes the past. In the middle of a decline nobody knows whether a 10% fall will stop there or deepen into a bear market, and the line between a 19% fall and a 21% fall is arbitrary. Another common misunderstanding is that the word implies prices were too high and are being put right. The term says nothing about value or cause; it only measures the size of the fall from the peak.

For a private investor building a long-term portfolio, corrections are a normal part of owning shares. The S&P 500 had 25 positive calendar years out of the 32 from 1994 to 2025, yet annual figures hide the falls that can happen within a year. Its total return, meaning price gains plus reinvested dividends, was 10.7% a year from January 1993 to June 2026, and that figure was earned through every decline along the way. Investors who recognise a correction for what it is tend to find it easier to stay with their plan, rather than selling after a fall and missing the recovery.

By Dr. Harry Hamann

What is the difference between a correction and a bear market?
A correction is a fall of 10% to under 20% from a recent peak; a bear market is a fall of 20% or more. Both are conventions rather than official definitions, and a correction can deepen into a bear market.

Is a correction the same as a crash?
No. A crash describes a fall of 20% or more, often a fast one. A correction is smaller, between 10% and 20%. For example, the S&P 500 fell 54.6% with dividends from peak to low in 2007–2009, far beyond correction territory.

How is a correction measured?
From the most recent peak, usually the highest closing price, to the current or lowest price. Divide the fall by the peak value: a drop from $100 to $90 is $10 divided by $100, or 10%.

Does a correction mean the market was overvalued?
Not necessarily. The term only describes the size of a fall, not its cause. Declines can follow economic news, rising interest rates or shifts in sentiment, whatever the starting valuation.