Core Idea
Why earnings are special in options
Ahead of quarterly earnings, option markets often price a larger-than-normal move into the cycle that contains the event. That is why implied volatility tends to rise in the earnings expiration. Once the report is out, that event premium can disappear very quickly, which is what traders usually call the IV crush.
An earnings trade is therefore not only about getting the direction right. The more important question is whether the realized move ends up smaller or larger than the move already priced by the market, and how hard implied volatility contracts once the event is over.
Classic earnings structures often use calendar spreads or diagonal spreads, because they try to sell the inflated front-month earnings volatility against a longer-dated option. In practice, however, an iron fly can also be very effective when the goal is to target a limited move plus a volatility crush more directly.
Calendar spread as a classic earnings structure
A typical earnings calendar uses the same strike with two different expirations. The short option is sold in the rich earnings cycle, while the longer-dated option is bought behind it.
- Short front month This is the option inflated by the earnings event.
- Long back month The longer-dated option usually holds its value better.
- Goal The short option should lose value faster right after the announcement.
- Risk A move that is too large can overwhelm the volatility edge.
For the concrete example below I still use an iron fly, because that is the structure you described and it is a very direct way to express a post-earnings IV crush idea.
Concrete example: iron fly around the expected move
First we look for a stock with upcoming earnings. The OWS can help with that, because the ITM covered call workflow already scans stocks and ETFs with live option data.
Next we estimate the expected move. A very practical shortcut is: ATM call mid + ATM put mid = expected move. If the ATM call mid is 4.20 USD and the ATM put mid is 3.80 USD, the market is roughly pricing an 8.00 USD move.
For the actual earnings trade, the preferred choice is usually the first expiration after earnings, meaning the first cycle that still contains the report. We then place an iron fly: the short call and short put sit at the current strike, and the wings are placed roughly at the expected move.
That first expiration after the report usually carries the largest share of the event risk. Later expirations may still include some earnings effect, but it is diluted by the extra time value. Traders who want to express the IV crush directly therefore usually stay close to the first post-earnings cycle.
- Stock at 100 USD That is the current spot price.
- Expected move 8 USD Based on ATM call mid 4.20 plus ATM put mid 3.80.
- Short 100 call + short 100 put This creates the center of the iron fly.
- Long 92 put + long 108 call The wings sit around the expected move.
- Goal Profit from the IV crush after earnings while staying inside the wings.
The trade has two ideal drivers: first the volatility contraction right after the report, and second a realized move that remains inside the wings. That is why traders often place the wings roughly at the expected move.
The flip side matters just as much: if the stock closes well outside the wings, the trade can still lose even when the IV crush arrives exactly as expected. The volatility effect alone is not enough if the post-earnings move is too large.
That is why earnings trades are often closed early once the IV crush and the first drop in option prices have already done their job. Waiting too long often replaces event edge with plain directional risk.
Sources: Fidelity, Options Around Earnings, Fidelity, Short Iron Butterfly Spread, tastylive, Calendar Spread, Fidelity, Expected Move via ATM Call + Put