IV Crush Around Earnings, Explained

What IV crush actually is

An option's price has two parts: intrinsic value, which is what the option would be worth if exercised right now, and extrinsic value, which covers everything else. Extrinsic value depends heavily on implied volatility (IV), the market's estimate of how much the stock is likely to move before the option expires.

IV crush is the name traders use for a fast, large fall in implied volatility. The Options Industry Council calls it volatility crush and describes it as what happens when uncertainty is resolved and option premiums reprice. Earnings reports are the most common trigger, but the same pattern can follow any scheduled event with an uncertain outcome, such as a drug trial result, a court ruling or a major economic release.

The key point is that IV crush is not a market malfunction. Before the event, option sellers demand extra premium to take on the risk of a big surprise. Once the news is public, that particular risk is gone, so the extra premium disappears with it.

Why implied volatility rises into earnings

An earnings date is known in advance, and the stock can gap sharply in either direction on the result. Anyone selling an option that spans that date is exposed to the gap, so buyers have to pay more to get the seller to take the other side. That extra price shows up as higher implied volatility.

The build-up is usually gradual. IV often climbs over the days and weeks before the report, and it tends to be highest in the expiration that comes first after the announcement. Research from ORATS shows that the expiration with the largest earnings effect is typically the one right after the report, because the earnings day makes up a bigger share of that option's remaining life. An expiration that ends before the report carries no earnings effect at all.

This is why an options chain the week before earnings often shows a lopsided term structure: the nearest post-earnings expiration has noticeably higher IV than the expirations further out. Volatility analysts call that shape inverted or backwardated.

Expirations before the report: little or no earnings premium.
The first expiration after the report: usually the most elevated IV.
Later expirations: less affected, because the single earnings day is a smaller slice of their life.

What happens after the announcement

Once the numbers are out, the market no longer has to price an unknown result. Implied volatility in the near-term expirations usually falls at the next open, often by a large amount in a single session. Longer-dated expirations typically fall by less, for the same reason they rose by less.

OptionMetrics, which studied several heavily traded technology stocks since 2020, found that IV fell after most of their earnings announcements and that the declines tended to be larger than the increases. That matches the general pattern described by the Options Industry Council: IV climbs into the event and reprices quickly once it passes. It is a tendency, not a rule. If the result is a genuine shock, or it creates new uncertainty, IV can stay high or even rise.

A hypothetical example of the crush

The Options Industry Council uses an example along these lines. Take a hypothetical $100 stock the day before earnings. A trader buys the $105 call for $2.90 while implied volatility is around 80%.

After the report, the stock opens at $106, so the call is now $1 in the money. But implied volatility has dropped to around 30%. With far less extrinsic value left, the call is worth roughly $2.10. The stock moved the way the buyer hoped, past the strike, and the option still lost value.

The reason is that the $2.90 price already assumed a large move. A move of about 6% was smaller than what the inflated IV had priced in, so the gain from the stock rising was outweighed by the loss of volatility premium. The lesson is not that the trade was wrong or right; it is that the price of an option before earnings carries a built-in assumption about the size of the move.

The implied move: reading what the market expects

A practical way to see how much movement is priced in is the implied move, sometimes called the expected move. A common shortcut is to look at the price of the at-the-money straddle, a call and a put at the same strike, for the first expiration after earnings. Divided by the stock price, that gives a rough percentage the market is pricing for the event. Some platforms scale it down, for example to about 85% of the straddle, or derive it from at-the-money IV as a one standard deviation range.

Treat the implied move as an estimate of size, not direction. It tells you how large a move option prices currently assume, in either direction. It is not a forecast, and actual moves regularly land well inside or well outside it.

Comparing the implied move with how far the stock has moved after past reports can give useful context about whether current premiums look large or small relative to that stock's history. IV Rank and IV Percentile, which the Options Industry Council also describes, serve a similar purpose: they compare today's IV with its own range over the past year. None of these tools predicts what the stock will do.

Which positions feel the crush

The Greek that measures exposure to IV changes is vega: roughly how much an option's price changes for a one percentage point change in implied volatility. Long options have positive vega, so a fall in IV hurts them. Short options have negative vega, so a fall in IV works in their favor, all else equal.

All else is rarely equal around earnings. A seller of options who benefits from the IV drop is still exposed to the stock gapping further than the premium collected, and that loss can be large. A buyer who loses volatility premium can still come out ahead if the move is big enough. What matters is the size of the actual move compared with what was priced in, plus how much IV falls.

Spreads that combine different expirations, such as calendar spreads, are affected unevenly because the front expiration usually loses more IV than the back one. Spreads that are long and short options in the same expiration partly offset each other's vega. The point for a learner is to know which way each leg leans before the event, not to assume any structure is immune.

Long calls and puts: positive vega, hurt by a falling IV.
Short calls and puts: negative vega, helped by a falling IV but exposed to a large gap.
Multi-leg positions: net vega depends on how the legs balance and which expirations they use.

Practical habits for earnings season

Check the earnings date before opening any options position, and note whether your expiration falls before or after it. Many brokers flag the date on the chain. Look at the IV of your chosen expiration compared with the ones around it to see how much event premium is built in.

Use your broker's analysis tools to model the position with a lower IV after the event, not just a different stock price. Seeing the profit and loss at the same stock price with a sharply lower IV makes the crush concrete before any money is at risk.

Finally, remember that gaps at the open and wider bid-ask spreads are common around earnings. Before trading options, read the OCC's Characteristics and Risks of Standardized Options and make sure you understand the full range of outcomes, including the worst case.

The Short Version

IV crush is a rapid fall in implied volatility after a known event, most often an earnings report.
IV builds into earnings and is usually highest in the first expiration after the report.
Because option prices assume a large move, a stock can move in the expected direction while a long option still loses value.
The at-the-money straddle gives a rough read of the move the market is pricing, in size but not direction.
Vega tells you how exposed a position is: long options lose from the crush, short options gain from it but carry gap risk.

Questions

What is IV crush in options?

It is a sudden drop in implied volatility after uncertainty is resolved, most often right after an earnings report. Because implied volatility drives an option's extrinsic value, option prices fall even if the stock price barely changes.

Why did my call lose money when the stock went up after earnings?

The price you paid assumed a large move. If the stock's move was smaller than the move priced in, the loss of extrinsic value from falling implied volatility can outweigh the gain from the stock rising.

When does IV crush happen?

Usually at the first open after the announcement. For a report released after the close, that is the next morning. The drop is usually largest in the nearest expiration that spanned the event.

Does IV crush happen every earnings season?

It is common but not certain. Studies such as OptionMetrics' show IV falling after most earnings reports for the stocks it examined, but a surprising result or new uncertainty can keep implied volatility elevated or push it higher.

How do I estimate the move the market is pricing for earnings?

Take the price of the at-the-money straddle in the first expiration after the report and divide it by the stock price. That gives a rough percentage move priced in either direction. It is an estimate of size, not a forecast.

Which Greek measures exposure to IV crush?

Vega. It estimates how much an option's price changes for a one percentage point change in implied volatility. Long options have positive vega and lose value when IV falls; short options have negative vega.

Sources

More guides: Implied Volatility Explained: What IV Means

This article is for educational purposes only and is not financial, investment, or tax advice. Options involve substantial risk and are not suitable for all investors. All examples are hypothetical.