IV crush is a sharp, sudden drop in an option’s implied volatility, most commonly right after an earnings report, that can shrink the option’s price even when the underlying stock moves the way a trader expected. Implied volatility (IV) is the market’s estimate of how much a stock is likely to move, and it gets priced up ahead of a known event because of the genuine uncertainty about the outcome. Once the event happens and that uncertainty resolves, one way or another, the inflated volatility has nowhere left to go but down, and option prices built partly on that inflated volatility fall with it.
Why implied volatility spikes before an event
Options pricing has two main ingredients working on it at once: how far the stock is expected to move (implied volatility) and how much time is left before expiration (time value). Ahead of a known event like earnings, the market genuinely doesn’t know what’s about to happen, and that uncertainty gets priced directly into the option as elevated implied volatility, on top of and separate from the stock’s actual price. A stock that normally trades with modest day-to-day volatility can show sharply elevated IV in the days before its earnings date, purely because of the binary unknown sitting on the calendar.
Why it collapses right after
Once the earnings report is out, or the FDA decision is announced, or whatever the event was, the uncertainty is gone. The market now knows the outcome, so there’s no more reason to pay a premium for not knowing it. That premium, the inflated IV, evaporates fast, often within minutes of the news hitting. This is IV crush: not the stock’s price changing, but the volatility component of every option on that stock repricing sharply lower, all at once.
How a correct direction call can still lose money
This is the part that catches new options buyers off guard. An option’s price responds to both the stock’s move and its implied volatility, and those two forces can point in opposite directions. Say a trader buys a call option the day before earnings, expecting the stock to rally. The next morning, the stock does rally, maybe 3%. But implied volatility, which had been priced up ahead of the report, crushes by a large amount the moment the uncertainty resolves. If the volatility collapse outweighs the value added by the stock’s actual move, the call can lose money even though the direction call was right. This is the single most common way traders learn about IV crush: by being right about the stock and still losing on the option.
How to avoid getting caught by it
Two practical approaches:
- Avoid buying options into a known volatility event. If a stock reports earnings tomorrow morning, buying a call or put today means paying a price that already has next-day’s volatility crush baked into the cost, working against the position from the moment it’s filled.
- Be on the selling side of volatility instead of the buying side. A trader who sells options, through credit spreads, iron condors, or covered calls, is on the other side of that same trade: elevated implied volatility ahead of an event means richer premium collected upfront, and a volatility crush after the event works in the seller’s favor rather than against it. This is the core reason defined-risk premium-selling strategies are structurally less exposed to IV crush than buying options outright.
Checking a stock’s next earnings date before opening any options position, long or short, is the single habit that prevents most accidental exposure to this. It costs nothing and takes under a minute.
IV crush vs. ordinary theta decay
The two are easy to confuse but mechanically different. Theta decay is the slow, steady loss of an option’s extrinsic value as expiration approaches, present in every option, every day, event or no event. IV crush is not gradual: it’s a sudden, one-time repricing tied to a specific event resolving. An option can lose value every single day from theta and then lose a much larger chunk all at once from IV crush the morning after earnings. Both erode an option’s price, but theta is a clock, and IV crush is a light switch.
Frequently asked questions
What is IV crush in options trading?
IV crush is a sharp drop in an option's implied volatility right after a known event, like an earnings report, passes. Implied volatility is priced up going into the event because of the uncertainty; once the event happens and the uncertainty resolves, that inflated volatility collapses, and option prices fall with it, sometimes even if the stock moved in the direction a trader expected.
Can you lose money from IV crush even if you predicted the stock's direction correctly?
Yes, and it's the single most common way IV crush surprises new options buyers. An option's price is a function of both the stock's move and its implied volatility. If a trader buys a call before earnings, the stock rises the next morning, but implied volatility collapses hard enough, the call can still lose value, because the volatility component of the price fell by more than the directional move added.
How do you avoid IV crush?
The two most direct approaches are avoiding long options into known volatility events altogether, or being on the selling side of the volatility instead of the buying side (credit spreads, iron condors, covered calls), since a seller benefits when implied volatility collapses rather than getting hurt by it. Checking a stock's earnings date before opening any options position is the simplest habit that prevents most accidental IV crush losses.
Does IV crush only happen around earnings?
Earnings is the most common and predictable trigger, but the same mechanic applies to any scheduled event with real uncertainty attached: FDA decisions, court rulings, product announcements, economic data releases like a Fed meeting. Any time implied volatility gets bid up ahead of a known date because the market doesn't know the outcome yet, that volatility has somewhere to go once the outcome is known, and it's almost always down.