IV crush after earnings: why options can lose value

What changes when earnings uncertainty clears?

An option’s premium is its price. Implied volatility, or IV, is calculated from that price using an options model and its other inputs. FINRA distinguishes IV from historical volatility: IV comes from current options prices, while historical volatility describes past price changes.

Before an earnings announcement, the size of the stock’s reaction is uncertain. Once the news arrives, option prices may reflect less uncertainty about that event. A sharp reduction in IV is often called an IV crush. The Options Industry Council describes this earnings repricing mechanism.

Higher IV is not a bullish or bearish signal. It concerns the amount of variability reflected in prices, not whether the company will report good news. Nor is a post-earnings IV decline guaranteed: the announcement may leave substantial uncertainty unresolved.

Separate the price into two parts

OIC’s options-pricing guide separates premium into intrinsic value and extrinsic value, also called time value. The strike is the contract’s exercise price. For the ordinary stock call in this example, intrinsic value is the stock price minus the strike price, with a floor of zero. For a put, reverse that subtraction.

Extrinsic value is the premium left after subtracting intrinsic value. Despite the name ‘time value,’ it reflects more than the clock: IV and other pricing inputs matter too.

Imagine the same unexpired $50-strike call observed before and after fictional earnings. The following prices are invented to demonstrate the arithmetic. They are not actual quotes, model valuations or assumed trade fills.

The stock rose $2.00, but the call premium fell $0.80. Intrinsic value increased $2.00 while extrinsic value decreased $2.80: +$2.00 − $2.80 = −$0.80.

This shows how a favorable stock move can coexist with a lower option price. It does not prove that all $2.80 of the extrinsic-value decline came from IV. Stock movement, elapsed time and volatility interact; these two observations alone cannot separate their effects.

Use vega as an estimate, with units attached

Vega estimates how much an option’s premium changes for a one-percentage-point change in IV, holding the other pricing inputs constant. OIC explains vega as a sensitivity, not a prediction of the next option price.

In a separate invented example, assume vega is $0.08 per quoted unit for each percentage point of IV. A change from 65% to 60% is a decline of five percentage points. The local estimate is $0.08 × (60 − 65) = −$0.40 per quoted unit.

With an assumed standard 100 premium multiplier, that corresponds to approximately −$40 for one contract, before charges. OCC’s equity-option specifications describe standard contract units and note that corporate actions can create adjusted contracts; check the actual contract terms.

This calculation holds everything else still. Vega itself changes as inputs change, so extending one reading across a large earnings repricing can be misleading. It neither predicts the stock move nor supplies an executable exit price.

Do not attribute every loss to IV crush

Schwab’s earnings-options discussion explains why a purchased call or put can lose value even when the stock moves in the anticipated direction. The stock move, time remaining and IV all matter together.

Before labeling a change ‘IV crush,’ make sure both observations refer to the same strike, expiration and call or put. Record the stock price, option price convention, IV source and timestamps at each observation. Comparing an old last trade with a new midpoint mixes two price conventions.

A wider bid-ask spread can also change what selling might bring in. That is a separate execution issue, covered in option mark price versus exit price. A price-component table or vega estimate cannot tell you what an order will fill for.

An earnings research checklist

Keep a short record of the event and contract before drawing a conclusion from an IV reading:

1. Confirm the announcement with the company’s investor-relations page. Record its date, time and time zone; a calendar estimate can change.
2. Identify the exact contract: underlying, call or put, strike and expiration. Check whether that contract is still alive when the announcement occurs.
3. Record when the quote and IV were captured. A scan from before the announcement cannot establish the post-announcement IV.
4. Keep IV comparisons consistent. Different strikes, expirations, quote inputs or model assumptions can produce different readings; one current number is not a historical comparison.
5. Write down the limits of any scenario. Which inputs are fixed? Which are guesses? List excluded costs, such as bid-ask spread and charges. Keep those omissions visible.

This checklist organizes evidence. It does not tell you to buy, sell or hold through the announcement.

Use ConvexRadar for context, then verify the inputs

ConvexRadar’s earnings context helps place an event beside a contract’s expiration. The calendar labels BMO as before market open and AMC as after market close; follow the source and confirm the date with the issuer. See the earnings options scanner for the workflow.

The scanner’s ‘Stored IV’ field comes from the stored scan and its legacy value is capped. It is not historical IV rank or percentile, and ConvexRadar does not currently calculate historical IV rank. A displayed number cannot establish how unusual IV is for that contract or forecast the post-earnings change.

Use the stored context to identify what needs checking, then obtain a current contract quote and confirm the data timestamp. The options education center explains the other inputs used in this research workflow.

Options involve substantial risk. A purchased option can lose its entire premium; selling options introduces obligations and can involve losses beyond the premium received. Read OCC’s options disclosure document before trading. This guide is general education, not a recommendation for a particular security or strategy.