⏱ 1-Minute Summary Earnings are a volatility catalyst: implied volatility inflates into the report and crushes right after. The market prices an implied move, so buyers pay inflated IV and need a bigger move to win, while sellers harvest rich premiums but face gap risk. Understanding the pre/post-earnings IV cycle is the key to trading it.
1. Why Earnings Are Special
An earnings report is a scheduled catalyst: the stock either beats, misses, or meets, and it often gaps. Until the report, uncertainty is high and option prices reflect it. This makes earnings one of the few predictable volatility events on the calendar.
2. How IV Behaves Around Earnings
- Pre-earnings: implied volatility rises in the weeks before, peaking just before the report. This is the "IV inflation" phase.
- At the report: the stock gaps.
- Post-earnings: IV collapses: the "IV crush", because the uncertainty is gone. Option premiums deflate sharply even if the stock moved.
The shape is predictable even though the direction of the move is not.
The chart above shows a schematic of how implied volatility behaves around an earnings date, from 30 days before to 30 days after. It assumes a baseline IV near 24% that inflates to a peak near 42% by the event (day 0) and then crushes to about 26% the day after. Buyers who pay the inflated premium near the event suffer as IV collapses, while sellers harvest the crush; the exact path differs by stock, but the inflation-then-crush shape is the earnings pattern.
The three charts above show how IV actually varies with moneyness, instead of staying constant as a single volatility number would imply. They are illustrative examples using a stock price of $200 and two expiration buckets (0–30 and 61–120 days), the near bucket capturing the earnings window.
The first chart shows a negative skew in the relationship between IV and moneyness. For calls, IV is higher in the money than out of the money; for puts, IV is higher out of the money than in the money. This reflects demand for OTM puts, expressing fear of a downside crash.
The second chart shows a positive skew. For calls, IV is lower in the money than out of the money; for puts, IV is lower out of the money than in the money. This reflects demand for OTM calls, expressing expectations of an upside rally.
The third chart shows a symmetric relationship. For calls, IV is the same in the money and out of the money, and higher than at the money; the same holds for puts. This reflects demand for both in-the-money and out-of-the-money calls and puts, expressing that an event could push the stock in either direction.
A single constant volatility cannot produce any of these shapes, which is why around earnings you should read the IV surface, not a single IV number.
3. The Implied Move
The implied move is the market's own estimate of the earnings move, backed out of option prices (approximately the cost of the ATM straddle). If the market implies a ±6% move and the stock moves 4%, the options were overpriced for that outcome.
- Move greater than implied → buyers can profit (if IV does not crush faster than the move).
- Move less than implied → sellers profit (the crush works in their favor).
4. Strategies Around Earnings
- Buyers (pre-earnings): a long straddle/strangle is a bet that the move exceeds the implied move. You pay inflated IV and fight the crush: high risk, high reward.
- Sellers (pre-earnings): selling credit spreads or condors harvests rich IV, and the crush helps, but a gap can reach your short strike fast. Use defined risk and small size.
- Post-earnings: once IV has crushed, the market's edge is reduced; many traders stand aside rather than chase.
The chart above shows vega, how much an option's price changes per 1% move in implied volatility, across the underlying price. It assumes a strike of 200 and a fixed implied volatility (IV) of 25% as the baseline; the lines show 30, 90 and 180 days to expiry. At a stock price of 200, the 180-day line reads about 0.46 per 1% IV move, the 90-day line about 0.33, and the 30-day line about 0.20. Every line peaks near the money and falls away from it, and longer-dated lines are taller and wider. Around earnings this is the engine of IV crush: a long-premium position carries positive vega, so when IV collapses after the report the same position loses value, while a seller's short vega profits; the more time to expiry, the bigger the vega swing per IV move.
5. Managing the Risk
- Know the implied move first: compare your expected move to what the market prices; never buy ahead of earnings without a plan.
- Size for the gap: an earnings gap can exceed your expectation; defined-risk structures cap the damage.
- Do not hold naked shorts: a gap against an uncovered short can be very costly.
- Expect the crush: if you are long premium into earnings, plan to exit the winner before IV fully deflates.
6. When It Works
- Selling works when IV is very rich (high pre-earnings IV) and you use defined-risk structures, the crush compounds your edge.
- Buying works only when you genuinely expect a move far beyond the implied move and have a plan for the crush.
⚠️ Platform Data Boundary: This article explains the earnings-volatility mechanics. The platform provides T-1 EOD closing data and closing IV: suited to daily-frequency, multi-day-to-multi-month research around earnings. The platform does not model intraday earnings gaps or same-day 0DTE dynamics; use it for understanding IV cycles, not for timing intraday earnings events.
⚠️ Research Use Only: This article is educational. Earnings moves are uncertain and can gap far beyond expectations; buying into inflated IV and selling naked shorts both carry substantial risk. Nothing here is a buy or sell signal. Use this platform's backtests as historical statistical reference only.