IV Crush Definition: IV crush is the sharp drop in an option’s implied volatility, and therefore in its price, right after a scheduled event such as an earnings report removes the uncertainty that traders had priced in. An options position bought at 80% implied volatility can lose about half its value overnight when volatility falls to 30%, even when the stock moves in the direction the buyer expected.
What Is IV Crush?
Options get more expensive before big news. Buyers want protection or a lottery ticket on the result, sellers want extra payment for the risk, and both push up the price. Once the news is out, that extra payment vanishes almost at once, and the sudden deflation is called IV crush.
IV stands for implied volatility, the level of future price swings that an option’s price implies. You cannot observe it directly. You start from the market price of the option and work backward through a pricing model to find the volatility figure that makes the model match that price. High implied volatility means the market expects large moves; low implied volatility means it expects calm.
The term is most often used around company results. Before an earnings date, the implied volatility of short-dated options on the stock can climb to two or three times its usual level. After the report, it drops back toward normal within one trading session.
How Does IV Crush Work?
To see why prices fall so fast, split an option’s price into two parts. Intrinsic value is what the option would be worth if exercised now. Extrinsic value, or time value, is everything above that, and it depends heavily on implied volatility. The sensitivity of an option’s price to a one-point change in implied volatility is called vega.
Before an event, a large share of the extrinsic value pays for one specific day’s uncertainty. When the result is known, that uncertainty is gone, so implied volatility falls and extrinsic value collapses with it. Only intrinsic value and the remaining normal time value survive.
Here is a worked example. A stock trades at $100 one week before expiry, with earnings due after tonight’s close. The $100 call and the $100 put each cost $4.40 at 80% implied volatility, so buying both, a position called a straddle, costs $8.80. That price tells you the market expects a move of roughly 9% in either direction.
The company beats the consensus estimate and the stock opens at $104, up 4%. Implied volatility falls to 30%. A buyer who held only the call now has an option worth about $4.30, a small loss despite being right about the direction. The straddle buyer is worse off: the pair is worth about $4.60, a 48% loss, because the stock needed to move past $108.80 or below $91.20 just to break even.
IV Crush vs. Time Decay
Both forces shrink an option’s extrinsic value, but they work on different clocks.
| IV Crush | Time Decay (Theta) | |
|---|---|---|
| Cause | Uncertainty removed by an event | Passage of time toward expiry |
| Speed | Sudden, often within minutes of the news | Gradual, accelerating near expiry |
| Greek that measures it | Vega | Theta |
| Predictability | Size depends on how much volatility was priced in | Steady and known in advance |
| Who benefits | Option sellers holding through the event | Option sellers over time |
Why Is IV Crush Important for Traders?
IV crush explains why buying options before earnings so often loses money. The price of an option already contains the market’s estimate of the move, which you can read from the options chain by adding the at-the-money call and put. To profit as a buyer, you need a move larger than that estimate, not merely a move in the right direction. In the language of earnings season, you need a surprise relative to the options market, much as a stock needs an earnings surprise relative to analysts.
Sellers, in contrast, collect the inflated premium and benefit when volatility drops. That trade has its own danger. If the stock moves 20% when the options implied 9%, a short straddle loses far more than the premium it collected, and an uncovered short call has no upper limit on losses.
Traders who want exposure to an event while limiting IV crush usually change the structure of the trade. Spreads, where you buy one option and sell another, offset part of the lost extrinsic value. Options with later expiry dates hold more normal time value, so the post-event drop is a smaller share of their price. Some traders simply trade the underlying stock or a CFD, whose value depends only on price and not on implied volatility.
Key Takeaways
- IV crush is the fast fall in implied volatility after a scheduled event, which shrinks option prices once the uncertainty is resolved.
- Implied volatility rises before events such as earnings because the option price must cover one day of unusually large risk.
- An option buyer can be right about the direction and still lose if the stock moves less than the move priced into the options.
- The at-the-money straddle price gives a rough estimate of the expected move, the benchmark a buyer must beat.
- Option sellers gain from IV crush but face large losses when the actual move is bigger than the implied move.
Does IV crush only happen around earnings?
No. Any scheduled event with an uncertain outcome can produce it, including central bank decisions, drug trial results, court rulings and product launches. Earnings are the most common case because they come every quarter for thousands of stocks.
Can IV crush be avoided?
You cannot stop it, but you can avoid paying for it by not holding long options through the event, by using spreads that offset some of the lost value, or by choosing longer-dated options whose price depends less on one report.
Do sellers of options always profit from IV crush?
No. Sellers collect the inflated premium, but if the stock moves further than the implied move they lose, and the loss on an uncovered short option can far exceed the premium received.
How do I know how much IV crush to expect?
Compare the implied volatility of the option that expires just after the event with options expiring later. The larger the gap, the more volatility is tied to the event and the further it is likely to fall once the news is out.
