You bought a call three days before earnings. Your read was right — the company beat, the stock jumped 6%.
Your call should have printed. Instead it lost money.
If that's happened to you, you've met IV crush — and learned the hard way that being right about direction isn't enough. This guide explains exactly what IV crush is, why it drains your premium even when you win the bet, and how to stop being on the wrong side of it. Then you can drag the sliders yourself in a free IV Crush Simulator and watch it happen in real time.
What Is IV Crush?
IV crush is the rapid collapse in a stock's implied volatility immediately after a scheduled event removes uncertainty — most commonly an earnings announcement.
Here's the sequence:
- Before the event: Nobody knows the outcome, so traders bid up options as insurance and speculation. Implied volatility (IV) — the market's expectation of future movement — climbs. Premiums get fat.
- The event happens: The result is now public. The single biggest unknown is resolved.
- After the event: With the uncertainty gone, IV collapses. Premiums deflate — often 30–60% for front-month options — frequently within minutes of the report.
The stock price reacts to the news. The option price reacts to the news and to the volatility collapse. That second force is the one that ambushes beginners.
Why It Happens: The Vega Connection
Every option price has an input called implied volatility, and the Greek that measures sensitivity to it is vega.
Vega = how much an option's price changes when IV moves by one percentage point.
If a call has a vega of 0.10 and IV falls from 80% to 40%, that's a 40-point drop × 0.10 = $4.00 of premium erased — purely from volatility, before you even account for where the stock went.
That's the whole trick. Into earnings, vega premium is inflated. After earnings, it's gone. If the delta gain from the stock's move is smaller than the vega loss from the IV collapse, your directionally correct trade still ends red.
A Concrete Example
Stock trading at $100, earnings in 5 days, IV at 80%. You buy the $105 call for $3.50.
Earnings hit. The stock rallies to $107 — you were right.
But IV crushes from 80% to 40%. The call is now worth maybe $3.00, not the $5.00+ you pictured.
- Delta gave you: ~+$2.00 from the $7 move
- Vega took away: ~−$2.50 from the IV collapse
- Net: a loss, despite a correct call
Same stock, correct direction, losing trade. Multiply that across a portfolio of earnings lottery tickets and you understand why "buy calls before earnings" quietly drains accounts.
See It Live: The IV Crush Simulator
Reading about IV crush and feeling it are different things. The free IV Crush Simulator lets you set up the exact scenario above and watch the premium collapse as you move the sliders — no signup, runs in your browser.
Try this:
- Open the IV Crush Simulator.
- Set spot and strike near the money, DTE to a few days.
- Set IV before high (say 60–80%) and IV after low (say 25–35%).
- Flip between long and short and between call and put, and watch the P&L flip with it.
In about two minutes you'll see why the buyer bleeds and the seller collects — the exact intuition that no static chart can hand you. For the full picture of how IV reshapes every strike at once, the Options Chain Simulator reprices the whole chain as you drag the IV slider.
Who Gets Hurt — and Who Gets Paid
Hurt by IV crush:
- Long calls and long puts bought into the event
- Long straddles and strangles (double the vega exposure)
- Any net-long-premium position
Helped by IV crush:
- Credit spreads (bull put spreads, bear call spreads, iron condors)
- Covered calls and cash-secured puts
- Short straddles/strangles (highest reward, highest risk)
This is exactly why income traders sell premium into elevated IV and buy it back after the crush. They're not betting on direction — they're harvesting the volatility premium that buyers overpay for.
How to Avoid (or Trade) IV Crush
1. Stop buying naked long options into earnings. It's the most common beginner mistake for a reason — the vega math is against you. If you have a strong directional view, express it with a spread, not a lottery ticket.
2. Use defined-risk spreads. In a bull call spread you buy one call and sell another. The short call you sold also loses value to the crush, offsetting part of the vega hit on your long call. You keep directional exposure while blunting the volatility drain.
3. Be the seller. If you're comfortable with defined-risk credit strategies, IV crush works for you. Sell a bull put spread before earnings on a stock you're neutral-to-bullish on: you profit from the crush and from the stock holding up. The Probability & EV Calculator runs a 5,000-path Monte Carlo so you can check whether the premium actually compensates you for the risk after accounting for the expected move.
4. Respect the expected move. A long straddle only wins if the stock moves more than the crush costs you. Before you buy one, compare the market's implied move to how big the IV collapse typically is on that name. If the expected move doesn't clear the crush, skip it.
The Bigger Picture
IV crush is one specific, dramatic case of a broader truth: option prices depend on far more than stock direction. If IV crush caught you off guard, the fix isn't to memorize a rule — it's to build intuition for how volatility, time, and price interact.
For the full mechanics of implied volatility, IV rank, and volatility skew, read Implied Volatility Explained. To see how the clock alone erodes premium, read Theta Decay Explained. And for the sensitivities behind all of it, start with Options Greeks Explained.
Try It Before You Trade It
The traders who never get ambushed by IV crush aren't the ones who read the most about it — they're the ones who've watched premium collapse enough times to feel it coming.
Open the free IV Crush Simulator and set up an earnings scenario. Drag IV from 70% down to 30% and watch your long call bleed while the same trade, sold short, collects. No account, no payment — just the intuition that keeps you on the right side of the crush.
Want the structured path? Module 1 of OptionsLabPro is free with no signup, and the full Volatility Trading curriculum ($29/mo Pro, cancel anytime) turns this intuition into a repeatable edge.