What is IV crush? Right on the stock, red on the option

IV crush is the expectation premium built into an option deflating the moment a known event — usually earnings — resolves, and it is the mechanism behind one of the most common shocks in options trading: the stock moves your direction and the contract still opens red. This page walks the math, a worked example, and how to check event dates before you pay for drama. Research and education only — not financial advice.

The expectation premium, and why it deflates

Every option premium is two things stacked together: intrinsic value (what the contract would be worth if exercised right now) and extrinsic value (everything else — time and expectation). The expectation part is priced by implied volatility: the market's live estimate of how much drama is coming, baked directly into what you pay. Two stocks at the same price with the same strike and expiry can have wildly different premiums purely because the market expects one of them to be wild.

Before a scheduled event, that expectation swells. Everyone knows earnings land Thursday night, nobody knows the number, so the options covering that date get bid up — the uncertainty itself has a price. The moment the report drops, the uncertainty is resolved. Whatever the stock does next, the big question has been answered, and the expectation premium deflates — often overnight, often violently. That collapse is IV crush.

It isn't a glitch, and it isn't market makers picking your pocket. It's the price of drama resetting once the show is over. The trap is that the deflation is largest at exactly the moment beginners feel most compelled to buy: right before, or right after, big news.

Why earnings are the classic setup

Earnings are the purest version of the trap because they're scheduled. A surprise crash inflates IV too, but an earnings date is on the calendar months ahead, so the inflation is systematic: in the days before the print, the expiration that covers the event trades at a visibly higher IV than the ones before and after it. You are not sneaking into a cheap theater — the drama is fully marked up before you arrive.

The post-earnings morning, in one blunt hypothetical: the stock moves your direction 3%, IV drops 30 points, and your option opens red. You were right. The ticket was just marked up too far. You paid $2 of drama for a $1 move.

A worked example: right on direction, still losing

Here is the whole trap in one hypothetical ledger — teaching math, not a trade. Suppose stock XYZ trades at $50 and reports earnings tonight. The $50 call expiring this Friday is quoted at a $2.30 premium with IV at 90% and a vega of about 0.025 — all hypothetical figures chosen to be realistic for an at-the-money weekly ahead of a print.

Earnings land fine. The stock gaps up 3% to $51.50. You called the direction. Now run the option's ledger for that single overnight session, using the one formula that matters here — price change ≈ vega × IV change in points (the dial is vega):

Line item	Per-share effect	What it is
Delta gain	+$0.78	$1.50 stock move × ~0.52 delta — the part you were right about
Vega loss	−$0.88	IV collapsing 90% → 55% (35 points) × 0.025 vega — the crush
Theta	−$0.15	One more day of time decay on a weekly
Net	−$0.25	≈ −$25 per contract on a $230 ticket, roughly −11%, in this hypothetical

The stock did what you predicted, and in this simulated example the position still opens down double digits, because the expectation premium you bought at the top deflated by more than the move paid you. That is IV crush in one table: options are direction bets and price-of-drama bets, settled on the same ticket.

The same mechanism shows up outside earnings. Take a hypothetical put bought the day after an 18% crash, carrying an IV of 70.9% — pricing that implies roughly 4.5% daily swings indefinitely (IV ÷ 15.9 gives the implied daily move). With a vega of 0.0104, every 10-point cool-down in IV drains about $10.40 per contract in this simulated example, with the stock standing completely still. One calm day and the drama premium starts leaking out on top of the daily theta rent. Two invisible taxes, same wallet.

Where people get hurt: buying options right after huge news — earnings, crashes, squeezes — because that's exactly when they FEEL most urgent and ARE most expensive. Peak fear and peak greed are both peak IV. If the urge to buy arrived with the headline, the markup arrived first.

How to check event dates before you buy

This is one of the few options traps you can check for in two minutes flat. The check is not "will earnings be good" — it's "does my contract live through a scheduled uncertainty, and am I paying event prices for it?"

Find the earnings date. Most broker apps show it on the ticker page, and the company's investor-relations site is the primary source. Note whether the date is confirmed or estimated — estimated dates slip, and a slipped date can move the event into or out of your expiration.
Compare it to your expiration. If the contract expires after the report, you are buying the event whether you meant to or not, and the premium already includes it. If it expires before, you're clear of the crush but also clear of the move.
Look for the IV kink. Pull up the option chain and compare IV across expirations. If the expiry covering the event is trading at a sharply higher IV than its neighbors, that gap is the event premium — and most of it evaporates at the print.
Run the drama tax. Compare IV to how much the stock has actually been moving (realized volatility). A useful rule of thumb: above roughly 1.35× realized, you're at the scalper's window. A second sanity check: divide IV by 15.9 to get the implied daily move in percent, then look at a two-week chart and ask whether the stock actually moves that much.
Sweep for non-earnings events. FDA decision dates, Fed meetings, CPI mornings, product launches, lockup expirations, court rulings — anything scheduled inflates the covering expirations the same way. Earnings are just the version that runs every quarter on thousands of tickers.

How a quant desk treats event risk

On our desk, the catalyst check is a standing stage of the pipeline, not an afterthought: every session runs a full-market scan across thousands of symbols, then a catalyst check, an adversarial review, and a liquidity screen before anything becomes a card. Ideas ship with a trigger, TP1/TP2, a stop, and a time-stop, posted to a public, timestamped record before the move — and the record is a paper/model desk, no real money, with the losers left on the board. You can audit it, crushed premium and all, at the record.

The drama tax is exactly the kind of thing that adversarial review exists to catch: paying 1.35×+ realized volatility for a ticket bleeds premium even when the direction calls are decent. For scale, our published hypothetical backtest of the raw scanner traded blind — no volatility filter, no event discipline — produced a 46.6% win rate and a 0.82 profit factor across 161 simulated trades. The filters are not decoration.

Want the longer, gentler version? Our beginner handbook Options, In Plain English treats implied volatility as what it is — the price of drama — and walks the math for people starting from zero. A free chapter is at Options, In Plain English (available in EN/ES/PT/FR).

The 30-second recap

IV crush = the expectation premium deflating the moment a scheduled uncertainty resolves. Earnings are the classic, quarterly version.
You can be right on direction and still lose: delta pays you for the move, vega charges you for the drama reset, and the reset is often bigger.
The math is one line: price change ≈ vega × IV change in points. A 30-point crush on a 0.025-vega contract is $75 per contract, stock move not included.
Pre-flight before any options buy: confirm the event date, check it against your expiration, look for the IV kink across expirations, and compare IV to realized volatility (~1.35× = scalper prices).
The urge to buy is strongest exactly when the markup is largest. That is not a coincidence — urgency is what the premium is made of.

Common questions

What is IV crush in simple terms?

Options get more expensive when a big, scheduled unknown is coming — earnings, an FDA date, a Fed meeting — because the market prices in the uncertainty. The instant the event happens, the uncertainty is gone and that extra premium collapses. IV crush is that collapse: the option deflating even if the stock moves the direction you predicted.

How much does IV drop after earnings?

There's no fixed number — it depends on how much event premium was built in and how surprising the result was. The way to translate any drop into dollars is vega: price change ≈ vega × IV change in points. Check the option's vega before buying and run the math on a plausible post-event IV; the chain's non-event expirations give you a rough floor for where IV can settle.

Can IV crush happen without earnings?

Yes. Any resolved uncertainty deflates the premium: FDA decisions, Fed meetings, CPI releases, court rulings, lockup expirations — even an unscheduled panic. Options bought at the peak of a crash carry the same inflated drama pricing, and one calm day starts draining it out whether or not the underlying thesis was correct.

How do traders try to avoid IV crush?

The educational checklist: know every scheduled event inside your contract's lifetime, compare IV across expirations to spot the event markup, and compare IV to realized volatility (above roughly 1.35× is paying up for drama). Some structures carry less vega exposure than single long options, but every structure trades one risk for another — this is a topic to research, not a signal to act on.

Does IV crush help option sellers?

Mechanically, falling IV reduces the value of the options a seller is short, which works in the seller's favor on that one dial. But selling options carries its own risks — including losses that can exceed the premium collected — and the same event that crushes IV can move the stock through a short strike. IV crush is one force on the ticket, not a free lunch for either side.

See the process with your own eyes. The desk posts trigger-based cards to a public, timestamped record — losses included — and published the backtest where its own raw scanner loses. The scoreboard is free to watch. Join the floor →

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Last updated 2026-07-11 · ClaudeQuantAlgo Research Desk · research and education only.

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