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Calendar spreads before earnings, and what usually goes wrong

Before a report, the expiry closest to the news gets expensive. A calendar spread sells that expensive option and buys a later one. The problem is what happens to both of them the morning after.

Options guide · 9-minute read · Updated 2026-10-29

The trade people put on before a report

Pick the expiry that lands just after the Earnings report. Sell an option there. Buy the same strike in a later expiry. Pay the difference.

The pitch is clean: the near option is stuffed with event premium, so you are selling the expensive one and buying the cheap one. After the news the event premium vanishes from the option you sold, and you keep the difference.

That does happen. It is not the usual outcome. The usual outcome is that event premium leaves both legs, and the one you own loses more dollars than the one you sold.

New to calendars? Read calendar spread explained first. The wider map is in option strategies beyond the wheel.

Why the spread looks so cheap before a report

Implied volatility is the market's guess at how much a stock will swing. Before a report that guess goes up, and it goes up most in the expiry closest to the news, because that expiry carries the whole event in a few days.

So the near option's price balloons while the later one only puffs up a little. The gap between them narrows. A calendar that would normally cost a dollar or two might cost half of that.

Cheap is the warning, not the edge. The spread is cheap because the market is telling you the stock is about to move a long way, and a long way is the one thing a calendar cannot survive.

A worked example (an illustration, not a trade idea)

Harbor Lane Coffee, a made-up company, trades at $60. Its report is in five days. You are quietly bullish and you think good numbers take it to around $65.

The market is pricing a swing of roughly $6 either way off the report.

You build a call calendar at the $65 strike:

• Sell the 10-day $65 call for $0.75 → collect $75
• Buy the 45-day $65 call for $1.25 → pay $125
• Net debit: $50. That is the most you can lose.

The near call's implied volatility is around 60. The later one's is around 35.

The stock did what you wanted, and the trade still lost

The report is good. Harbor Lane gaps to $72 the next morning — up, which is the direction you wanted, and past the strike you picked.

Implied volatility collapses, as it does after every report: the near expiry drops from about 60 to about 30, the later one from about 35 to about 25. That is IV crush.

Now price the two legs. The near call has 4 days left, the later one has 39.

• Buy back the 10-day $65 call: $700 (it is $7 in the money and has almost no time value left).
• Sell the 45-day $65 call: $730.
• The spread is worth $30. You paid $50.

Result: −$20.

The stock moved $12 when the market priced $6. You were right about direction, right about the news being good, and the trade still lost 40 cents on the dollar.

Every outcome the morning after

Same trade, same $50 debit, priced the day after the report with the volatility collapse already in.

Two things jump out of that table.

The winning band is narrow and it is not where you are standing. It runs from about $60.50 to about $70.50. The market priced a swing of $6, which covers $54 to $66. Half of what the market expected is a loss for you.

A stock that does not move at all loses money. The $60 row is a small loss, because you put the strike five dollars away and the stock never walked over to meet it.

How much of that was the volatility collapse

Take the $72 outcome and price it twice. Same stock price, same days left, same strike. The only difference is whether implied volatility fell.

A $40 swing on a $50 trade, and the stock price is identical in both rows.

Here is why. You are short a near option and long a later one, so you are net long Vega — you own more exposure to expected swings than you sold. The near leg was only worth $700 of real value plus a few dollars of time; there was barely any air left in it to deflate. The later leg had 39 days of air, and that is where the collapse landed.

That is the whole trap. People buy an earnings calendar to be short the inflated near option. The structure makes them long the later option's volatility too, and after a report that is the leg that gets hit.

What it would take for this to work

Three things have to line up, and the third one is the hard one:

1. The stock finishes near your strike after the report.
2. The near option's event premium evaporates, which it reliably does.
3. The later expiry's implied volatility holds up, which it often does not — especially on names where the later expiry was carrying event premium of its own.

Practical consequences:

• Put the strike where the stock already is, not where you hope it goes. Picking a target strike turns a volatility trade into a direction bet with a volatility trade's payoff, which is the worst of both.
• Read the later expiry's volatility, not just the near one's. If both are elevated, both will fall, and you own the one with more to lose.
• Size it as a total loss. The debit is small, which is exactly why people put on ten and discover they have a real position.
• Know your break-evens before the bell. Write down the two prices. If the market's expected swing is wider than the gap between them, you are being paid to be wrong.

A calendar into a report has nothing in common with the wheel strategy, which avoids holding a short option through a report at all. If the appeal of selling options was not having to guess direction, this trade quietly puts the guess back in.

On access: this is a two-leg spread, so it needs a higher Options approval level than covered calls at most brokers, and many Canadian brokers do not permit multi-leg spreads inside a TFSA or RRSP — check your broker's current options agreement first.

Price your own version in the options payoff calculator, then price the long leg again with a lower volatility number. The gap between those two answers is the risk.

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