Call Calendar Spread

What is a Call Calendar Spread?

A call calendar spread, also known as a horizontal spread or time spread, involves selling a short-term call and buying a longer-term call at the same strike price. You pay a net debit because the longer-dated option costs more. The trade profits when the short-term call decays faster than the long-term call, which naturally happens because options lose value more quickly as they approach expiration.

This is a time decay strategy with a neutral bias. You want the stock to stay near the strike price so the front-month call expires worthless while the back-month call retains its value.

How to Set It Up

• Sell 1 call at the near-term expiration (front month)
• Buy 1 call at a later expiration (back month) at the same strike
• Same strike price for both options
• Strike selection: Choose the ATM strike or the strike nearest to where you think the stock will be when the front-month option expires.
• Expiration gap: The front month is typically 20-30 days out. The back month is 50-90 days out. A wider gap means a higher debit but more time for the trade to work.

The net debit is the difference between the two option prices.

When to Use This Strategy

Use a call calendar spread when:

• You expect the stock to stay near a specific price in the short term
• Implied volatility for the front month is higher than the back month (or you expect it to rise in the back month)
• You want to profit from time decay with limited risk
• You are looking for a capital-efficient neutral trade
• You want to benefit from a potential IV increase in the back-month option

Calendar spreads benefit from an increase in implied volatility of the back-month option and from time decay of the front-month option. This dual benefit can make them very profitable in the right environment.

Example Trade

Stock XYZ is trading at $100. You expect it to stay near $100 for the next month.

• Sell 1 XYZ $100 call expiring in 30 days for $3.00
• Buy 1 XYZ $100 call expiring in 60 days for $4.50
• Net debit: $4.50 - $3.00 = $1.50 ($150 total)

If XYZ stays at $100 at front-month expiration: The short call expires worthless. The long call still has 30 days left and is worth approximately $3.00-$3.50. You can sell it for a profit of roughly $150-$200.

If XYZ moves to $110: Both calls are deep ITM. The spread between them narrows because time value matters less when options are deep ITM. The trade may break even or show a small loss.

If XYZ drops to $90: Both calls are OTM. The short call expires worthless (good), but the long call is also worth very little. You lose most of the $150 debit.

Risk and Reward

• Max profit: Occurs when the stock is exactly at the strike price at front-month expiration. The exact amount depends on the remaining value of the back-month option.
• Max loss: Net debit paid. $150 in our example. This happens if the stock moves far away from the strike in either direction.
• Breakeven: Approximately the strike plus and minus the debit, though the exact points depend on the back-month option value.

The profit zone is centered around the strike price. The trade makes money in a bell-curve shape.

Tips and Common Mistakes

• Close the trade at front-month expiration. Do not hold the back-month option alone unless you have a specific reason to.
• Volatility matters a lot. If IV drops across the board, the back-month option loses value and your trade suffers even if the stock stays flat.
• Wider expiration gaps are more forgiving but cost more upfront.
• Earnings between the two expirations can skew things. Be aware of scheduled events.

Related Strategies

• Put Calendar Spread — same concept using puts
• Double Calendar — two calendars at different strikes for a wider profit zone
• Call Diagonal Spread — calendar with different strikes for a directional bias