Long Calendar Call Spread
Sell 1 near-dated call, buy 1 longer-dated call at the same strike. Positive theta, profiting from the passage of time if price stays near the strike.
Profit / Loss Diagram
Long Calendar Call at the short expiration
What is this strategy?
The Long Calendar Call Spread — also called a <strong>Time Spread</strong> or <strong>Horizontal Spread</strong> — is a neutral strategy built from two calls at the <em>same strike</em> but <em>different expirations</em>: you sell a front-month call and buy a back-month call at that same strike. The result is a debit position that benefits from the passage of time if the underlying stays near the strike.
The secret of the calendar is <em>differential theta</em>: the short option loses value faster than the long one. If price stays at the strike, the short expires worthless while the long retains most of its value. Maximum gain arrives at the short leg’s expiration with price exactly at the strike — the moment you sell the long leg, capturing all its remaining extrinsic value.
It suits sideways markets with low expected realised volatility. Particularly useful when implied volatility is low, making the long leg cheap, and you expect stability or an increase in IV over the coming weeks. Risk is defined at the net debit; maximum gain is hard to calculate exactly at entry because it depends on the long option’s value when the short one expires.
Construction
| Action | Instrument | Strike | Expiration | Example |
|---|---|---|---|---|
| SELL | 1 Call | ATM (same strike) | Front (30 DTE) | -1 SPY May 450 Call |
| BUY | 1 Call | ATM (same strike) | Back (60-90 DTE) | +1 SPY Jul 450 Call |
Example
SPY at $450, low IV. You build a Long Calendar Call at the 450 strike with a May front month (30d) and a July back month (90d).
- Short May 450 Call +$300 premium received
- Long Jul 450 Call −$800 premium paid
- Net Debit $500
- Expected Gain (if SPY = $450 at the short expiration) +$200 to $300 (the long leg retains $700-800 and the short expires worthless)
- Maximum Loss $500 (the debit) on an extreme move
The Greeks
Delta close to zero when price sits near the strike.
The near-dated short loses theta faster than the longer-dated long. It benefits from the passage of time.
The longer-dated long carries more vega than the short. It benefits from rising IV.
Near the strike the position can flip quickly — significant gamma risk.
Position Management
- 01 Close at the Short Expiration Close both legs before the front month expires — typically 1–2 days early — to avoid extreme gamma and assignment.
- 02 Roll the Short Leg If price is still at the strike, you can roll the short to the next month for additional credit and extend the position.
- 03 30/90 DTE Sweet Spot A 30-day front and 90-day back balances differential theta against vega exposure.