IV Crush¶
OVERVIEW¶
IV crush is the rapid collapse of implied volatility — and therefore option premiums — that occurs the moment a significant binary event is resolved. Before earnings, FDA rulings, or Federal Reserve decisions, implied volatility inflates because the outcome is uncertain. The moment the outcome is known, that uncertainty vanishes and IV reverts sharply lower, often collapsing 50–70% within minutes of the market open.
Note
Options holders on the wrong side of this dynamic lose premium even when they are right on direction. Calling the move correctly does not protect against vega-driven losses.
HOW IT'S CALCULATED¶
The dollar impact of IV crush on an open options position is quantified through vega:
IV is expressed in percentage points. The market-implied expected move heading into an event is embedded in the ATM straddle:
| Variable | Description |
|---|---|
| Vega | Dollar change in option price per 1-point IV move |
| IV_before | Implied volatility level prior to the event |
| IV_after | Implied volatility level following event resolution |
| ATM Straddle | Sum of ATM call and put premiums; encodes the market's expected move |
Note
If a $210 stock has a straddle priced at $10, the market prices in a ±$10 (4.8%) move. A stock moving exactly $10 but with IV crushing from 72% to 28% still produces a net loss for the straddle buyer — vega loss exceeds delta gain.
WORKED EXAMPLE¶
Scenario: AMZN Q4 2025 earnings. Shares trade at $210. The ATM $210 call expiring in 5 days is priced at $9.40, IV at 72%, vega at 0.18. AMZN reports strong results and gaps up 4% to $218.40. IV drops immediately to 28%.
| Component | Calculation | Result |
|---|---|---|
| Delta gain | 0.50 × $8.40 | +$4.20 |
| Vega loss | 0.18 × (72 − 28) | −$7.92 |
| Net P&L | −$3.72 |
Note
The trader correctly identified direction and magnitude and still lost. This is the defining feature of IV crush: the volatility collapse overrides the directional profit.
HOW TO USE¶
Use IV crush awareness to determine whether to buy or sell premium ahead of events:
| Strategy | IV Crush Role | When to Apply |
|---|---|---|
| Credit spreads | Profit from IV collapse | Stock stays within implied move range |
| Iron condors | Profit from IV collapse | Low-realized-move underlyings |
| Strangles | Profit from IV collapse | High IV Rank, wide breakevens |
| Debit spreads | Reduced vega exposure | Directional bias with partial crush hedge |
| Long calls or puts | Hurt by IV collapse | Avoid into known binary events |
Screening workflow:
- Check IV Rank — confirm IV is elevated relative to its 52-week range before selling premium
- Compare implied vs. historical move — if the straddle prices in ±6% but the stock has realized ±3% over the last eight earnings, selling has positive expected value
- Evaluate vega exposure — calculate vega loss at expected post-event IV levels before entering any long premium position
Tip
IV Rank above 50 is the standard threshold for confirming that implied volatility is sufficiently elevated to justify premium-selling strategies ahead of an event.
LIMITATIONS AND COMMON MISCONCEPTIONS¶
Note
IV crush is not guaranteed. A severe earnings miss or unexpected guidance cut can keep IV elevated or push it higher post-announcement, particularly in small- and mid-cap names with low analyst coverage.
| Misconception | Reality |
|---|---|
| Debit spreads eliminate IV crush risk | They reduce vega exposure across both legs but do not eliminate it |
| Far OTM options are safe from IV crush | Near-zero vega limits absolute dollar loss, but percentage wipeout of premium can still be severe |
| The straddle move is a price floor | It is a probabilistic range — stocks routinely move far less than implied |
| Correct direction guarantees profit | Vega loss can exceed delta gain, producing a net loss on a winning directional call |