What Is IV Crush?

IV crush is the sudden drop in an option's implied volatility right after a known event — most often an earnings report — that removes inflated value from the option. Before the event, traders bid options up because the outcome is uncertain. Once the news is out and the uncertainty is gone, implied volatility collapses and option prices deflate fast. That's why a call can lose money after earnings even when the stock ticks up: the volatility you paid for vanished. The rest of this page shows exactly how that works, with numbers.

What IV crush means

Every option price has two parts: intrinsic value (how far in-the-money it is) and extrinsic value (time value + a premium for expected movement). Implied volatility (IV) is the market's estimate of future movement, and it drives the extrinsic part. When IV is high, extrinsic value is high; when IV falls, extrinsic value shrinks. IV crush is a fast, large fall in IV — so the extrinsic value of your options gets wiped out in a single session.

Why IV crush happens around earnings

Earnings are a scheduled jump in uncertainty. In the days before a report, traders don't know the outcome, so they pay up for options as protection or speculation. This pushes IV up — the IV rush. The moment results are released, the big unknown is resolved. There's no longer a reason to pay an event premium, so IV snaps back toward the stock's normal level. Because options were priced for a one-day jump, that snap-back is sharp. The same logic applies to FDA decisions, major product launches, and other binary events — but earnings are the classic case.

A worked example (with numbers)

Say stock XYZ trades at $100 the day before earnings. A 1-week at-the-money straddle (buy the $100 call + the $100 put) is priced with implied volatility of 80% and costs about $8.00 — meaning the market is pricing an implied move of roughly ±8%. You buy it expecting a big move.

Earnings come out. The stock rises +3% to $103 — you were right on direction! But implied volatility collapses from 80% to about 30% now that the event is over. Here's what happens to your straddle:

You were directionally right and still lost about 53%. The +3% move was far smaller than the ±8% the options implied, and the IV crush gutted the extrinsic value of both legs. That gap — implied move vs actual move — is the whole game. (Numbers are illustrative and rounded.)

Does IV crush affect in-the-money options?

IV crush only hits extrinsic value, never intrinsic value. So it affects every option that has time/volatility value — but unevenly:

• At-the-money options are almost entirely extrinsic value → hit hardest.
• Out-of-the-money options are 100% extrinsic value → also hit hard (and can go nearly worthless if the move doesn't reach them).
• Deep in-the-money options are mostly intrinsic value → least affected, because the crush can only chip away the small extrinsic portion.

This is why "lotto" OTM calls and ATM straddles are the most dangerous to hold through a print.

How to estimate IV crush

There's no single formula, but a quick mental model gets you close:

• 1. Note the pre-event IV on the expiry you care about (it's elevated).
• 2. Estimate the post-event IV — usually near the stock's normal, non-event level (look at IV between earnings, or use IV rank / IV percentile for context).
• 3. Re-price the option at the lower IV, holding the stock price and days to expiry roughly fixed. The drop in the option's extrinsic value ≈ the IV crush.

The practical version: compare the implied move to the stock's historical earnings moves. If options imply ±8% but the stock usually moves ±4%, buyers are likely to get crushed; if it usually moves ±12%, the premium may be fair or cheap. EarningsWatcher's Simulator does this re-pricing strike-by-strike so you don't have to guess.

How to avoid (or use) IV crush

You have three honest choices:

• Don't hold through it. Buy volatility early and sell before the report to capture the IV rush instead of eating the crush. See should you hold options through earnings?
• Use the crush in your favor. Defined-risk short-premium structures like iron condors and butterflies profit when IV falls — as long as the stock stays inside your strikes.
• If you must be long premium, pick names whose historical moves are large vs the implied move, size small, and consider softer structures than a naked straddle or strangle.

Common IV crush mistakes

• Buying cheap-looking short-dated options "for the move" without checking the implied move.
• Assuming a correct directional call is enough — it isn't if the move undershoots the implied.
• Holding naked short premium on names with fat-tailed earnings moves (small wins, huge tail loss).
• Blaming "bad luck" for a crush that was fully predictable from the pre-event IV.

How EarningsWatcher helps

EarningsWatcher is built around exactly this problem. The Simulator applies realistic, strike-by-strike IV crush to any structure you build, so you see your P/L across a range of earnings moves before risking anything. The Moves analyzer shows how a stock has actually moved on past earnings versus what was implied — the single best gauge of whether buying or selling premium has an edge. Use them together to plan around the crush instead of being surprised by it.

Frequently asked questions

What does it mean to get IV crushed?

It means you held options whose implied volatility collapsed after a known event such as earnings. The drop in implied volatility removes extrinsic value from your options, so they lose money quickly even if the stock barely moved or moved slightly in your favor.

How do you calculate IV crush?

There's no single formula, but you can estimate it: take the elevated pre-event implied volatility, estimate the post-event implied volatility (often close to the stock's normal, non-event level), then re-price the option at the lower volatility while keeping the stock price and time roughly constant. The difference in the option's extrinsic value is the IV crush. EarningsWatcher's Simulator does this strike-by-strike.

Does IV crush affect in-the-money options?

It affects the extrinsic (time/volatility) value of every option, including in-the-money ones, but not the intrinsic value. Deep in-the-money options are mostly intrinsic value, so they're hit less than at-the-money or out-of-the-money options, which are almost entirely extrinsic value.

How do you avoid IV crush?

Avoid holding long options through the event: either close before the report (capturing the IV rush instead), or use defined-risk short-premium structures that benefit when implied volatility falls. If you do hold long premium, size it small and choose names whose historical moves are large relative to the implied move.