Earnings IV crush explained

Why IV spikes into earnings

An option's price is mostly its theoretical value from Black-Scholes plus a vega premium reflecting market uncertainty about the underlying.

Before earnings, the market knows:

• The company will release information that will likely move the stock significantly.
• The expected magnitude of the move is unknown.
• The direction of the move is unknown.

That uncertainty gets priced into implied volatility. A name that normally trades with 25% IV might see IV ramp to 45-65% in the days before earnings.

The day after the announcement, the uncertainty resolves. The actual report is known. The stock has moved or not moved. There's no longer a binary unknown ahead. IV collapses back to baseline within hours.

The IV crush mechanics

Components of that $4.50 price:

• Intrinsic value: $0 (OTM)
• Time value with normal 25% IV: ~$0.80
• Extra vega from elevated IV: $4.50 - $0.80 = $3.70 of “earnings premium”

If NVDA opens at $210 (small move) the next morning:

• IV crashes from 65% back to 28%.
• Vega impact: -$2.50 (37 IV points × ~$0.07 vega).
• Theta impact: -$0.40 (one day of decay).
• Delta impact: small (move was small).
• New put price: ~$1.60.

Your $4.50 short collected $2.90 in a single overnight. That's the IV crush trade.

Three earnings trade patterns

Traders deploy IV crush in three ways:

1. Short single options (CSPs or covered calls). Sell out-of-the-money puts or calls right before earnings, hoping the underlying doesn't move outside the implied range. Profit from both IV crush and theta.

2. Short straddles or strangles. Sell both a put and a call. Profit from any small move. Lose if the underlying moves significantly in either direction. Higher risk, higher reward.

3. Iron condors. Sell a put spread and a call spread bracketing the expected range. Defined-risk version of the strangle. Lower premium but no unlimited loss exposure.

Of the three, single short options (CSPs especially) are the safest for retail traders. The straddle and strangle require more sophisticated risk management.

When IV crush trades go wrong

The trade fails when the actual move exceeds the implied move. The vega gain is overwhelmed by the delta loss.

Three patterns of failure:

• Massive earnings miss/beat. NFLX has historically moved 15-25% on earnings. ZM, ROKU, MDB are similar. Selling premium on these names is risky regardless of IV level.
• Sector-wide reaction. A tech leader's bad report can spark sector-wide selling, hurting your position even if the specific name didn't move much.
• Guidance shock. Sometimes a company beats earnings but guides down for the next quarter. The post-announcement move can be larger and slower than the day-of reaction.

Defense: pick names with smaller historical earnings moves. Use lower deltas (smaller premium but less risk). Size positions much smaller than your normal CSPs.

The safest IV crush variant

For retail traders just starting to play earnings, the safest approach is:

1. Pick liquid large-cap names with historical earnings moves below 5-8%. AAPL, MSFT, JPM are good candidates. NFLX, NVDA, ROKU are not (for beginners).
2. Sell CSPs below the implied move. If AAPL has a 5% implied move and is at $190, sell the $175 put (~8% below). The IV is rich; the strike is well outside the implied range.
3. Size at half your normal CSP size. The realized variance is 2-3x normal.
4. Close the next day after IV crushes. Don't hold to expiration; capture the IV crush profit and redeploy.

This approach can produce 3-8% returns in 24-48 hours on the trade. Compounded across earnings seasons, it's a meaningful additional return stream — but only if you're disciplined about which names to play.

FAQ

More in the Implied Volatility series

• What is implied volatility?
• IV rank vs IV percentile
• How to use IV to sell premium
• Read the full Implied Volatility guide