Vega and IV crush

Last updated: May 30, 2026 · Options Greeks series

Vega is the Greek that explains why earnings options behave so differently from regular ones. It measures how much an option's price changes when implied volatility moves. Most retail traders learn theta and delta first; vega is where the experienced traders quietly make their money.

If you understand vega, you understand why selling premium into elevated IV regimes is structurally favorable — and why getting caught long-vega into an IV collapse can wipe out months of profits.

What vega measures

Vega is the rate of change of option price with respect to implied volatility, holding everything else constant. The convention: a vega of 0.10 means a 1-percentage-point change in IV moves the option price by $0.10.

Example

AAPL $195 call, 30 DTE, premium $3, IV 25%, vega 0.10.

If IV jumps to 30% (5 points higher), the call gains $0.50 (5 × 0.10). New premium: $3.50.
If IV drops to 20%, the call loses $0.50. New premium: $2.50.

Vega is positive for long options (you benefit from rising IV) and negative for short options (you benefit from falling IV).

Why vega matters most around catalysts

IV doesn't move much in normal regimes. A liquid stock's IV might drift from 22% to 25% over a month — vega exposure is small.

Around catalysts, IV can move 20-30 points in days. Earnings, FDA decisions, geopolitical events, Fed meetings — all cause IV to spike beforehand and collapse afterward.

If you sold premium when IV was 45% and IV collapses to 25% after the catalyst, your short position gains roughly 20 × vega per option. For high-vega options, that can be the entire premium captured in a single day.

The earnings IV crush pattern

Best-documented pattern in equity options:

3-4 weeks before earnings: IV starts rising as the announcement approaches.
1-2 weeks before: IV climbs steadily. Premium gets noticeably richer.
Day before: IV peaks. Often 1.5-2x normal levels.
Day after the announcement: IV collapses immediately as uncertainty resolves. The vega component of the option price drops dramatically.

For premium sellers, this is the structural advantage. If you sell at peak IV and the underlying doesn't move much, you capture both theta (time decay) and vega crush (IV collapse). Combined, they can produce 70-80% of the option's value in 1-2 days.

The risk: if the underlying moves more than the implied move (which IV crush would suggest), the delta loss can swamp the vega gain.

Worked example: NVDA earnings

Setup

NVDA at $212. Earnings tomorrow. The $200 put 7 DTE is priced at $4.50 with IV at 65%.

Outcome 1: NVDA opens at $210 (small move).

IV crashes to 30%. Vega impact: vega of 0.07 × 35 point IV drop = -$2.45.
Delta impact: small (move was small).
Theta impact: -$0.40 (one day of decay).
Put now worth ~$1.65. Your short collected $4.50 - $1.65 = $2.85 in one day.

Outcome 2: NVDA opens at $195 (down 8%).

IV crashes to 35%. Vega impact: -$2.10.
Delta impact: huge. Strike now $5 ITM. Intrinsic value $5.
Put worth $5.50. Your short lost $1.00.

The asymmetry: if NVDA moves small, you make a lot. If it moves big, you lose a moderate amount. Over many earnings trades, the average outcome favors the seller — but the variance is high.

Vega in normal positions

For most non-catalyst trades, vega is a second-order concern. Day-to-day IV drift on a liquid name is 1-3 points; vega impact is $0.10-0.30 on a typical option.

Where vega matters in normal trading:

Long-dated positions. 90+ DTE options have much higher vega than 30 DTE. A volatility regime shift can move them 5-15%.
ATM options. Vega peaks at-the-money. Far OTM and far ITM options have less vega exposure.
Multi-leg strategies. Calendar spreads, straddles, and strangles have meaningful vega exposure that can dominate the trade's P&L.

FAQ

Is vega the same as volatility?

No. Volatility is the underlying measure (usually implied volatility, the market's forecast). Vega is how much the option price changes per 1-point change in IV. They're related but different.

When should I avoid being short vega?

Before known catalysts (earnings, FDA decisions, vote events). IV can spike dramatically before the event, so being short vega means watching your position's value rise unfavorably. Wait until after the catalyst when IV crushes.

Does vega depend on time to expiration?

Yes. Longer-dated options have higher vega because IV changes affect more remaining time. A 90 DTE option has 2-3x the vega of a 30 DTE option at the same strike.

How can I trade vega directly?

Calendar spreads (long longer-dated, short shorter-dated at same strike) are positive vega — they profit from rising IV. Strangles and straddles are also vega-positive. Conversely, iron condors and short volatility positions are vega-negative.

Ready to run the math?

Open the live calculator and try this on a real ticker.

Open the calculator →