Short Calendar Call Spread
The inverse of the Long Calendar Call: buy the near-dated leg and sell the longer-dated one. Profits from a strong directional move and/or a fall in IV.
Profit / Loss Diagram
Short Calendar Call at the short expiration
What is this strategy?
The Short Calendar Call Spread is the inverse of the Long Calendar: you buy the near-dated call and sell the longer-dated one at the same strike. You receive a net credit at entry, since the longer-dated leg is more expensive than the near-dated one.
It is a structure that is <strong>positive gamma and negative vega</strong>, and it is worth not calling it simply "long volatility": it profits if the underlying <em>actually moves</em>, and also if <em>implied volatility falls</em>. Those two engines point in opposite directions in the usual vocabulary, which is why this structure is so frequently misread. It loses the maximum if price finishes pinned to the strike, because the purchased leg expires worthless while the sold long-dated leg retains almost all its extrinsic value.
It fits ahead of events where you expect a volatility compression or an extreme move. It is considerably less common than the long calendar and demands an understanding of the <strong>term structure of implied volatility</strong>: if the front end is much more expensive than the back, the structure starts with an edge.
Construction
| Action | Instrument | Strike | Expiration | Example |
|---|---|---|---|---|
| BUY | 1 Call | ATM (same strike) | Front (30 DTE) | +1 SPY May 450 Call |
| SELL | 1 Call | ATM (same strike) | Back (60-90 DTE) | -1 SPY Jul 450 Call |
Example
SPY at $450, high IV ahead of an FOMC decision. You expect IV crush plus a directional move.
- Long May 450 Call −$300 premium paid
- Short Jul 450 Call +$800 premium received
- Net Credit +$500
- Maximum Gain $500 (the credit) if SPY moves away from the strike or IV compresses sharply
- Maximum Loss $200 to $300 — what the July call retains when the May call expires worthless with SPY at $450
The Greeks
Same as the long calendar but inverted.
Time works against you.
Negative vega: the sold long-dated leg carries more vega than the purchased near-dated one. It benefits from a fall in implied volatility.
Positive gamma: the purchased near-dated leg contributes more gamma than the sold one. It profits from a fast move in the underlying.
Position Management
- 01 Close Before the Short Expiration Close both legs while the near-dated long still holds value, so you do not surrender the whole reward.