What is a Calendar Spread? A Simple Guide

A calendar spread, also called a time spread, sells a near-expiry option and buys a longer-expiry option at the same strike. It profits from the faster time decay of the near option. It bets on time and volatility rather than direction.

A calendar spread is a clever way to profit from time decay itself. It pairs a fast-decaying near option against a slower-decaying far one at the same strike.

Let us unpack it with a real example and the points that matter. You can trade it on Stockk.

Key Takeaways

• Sell a near-expiry option, buy a far-expiry one, same strike.
• It profits from the near option decaying faster.
• It works best when price stays near the strike.
• It is sensitive to volatility as well as time.
• It is a non-directional strategy.

How does a calendar spread make money?

The near-expiry option decays faster than the longer-dated one, so if the underlying stays near the strike, the short option loses value more quickly than the long option. This difference in decay produces profit. The position also benefits if implied volatility rises in the longer-dated option.

Take the case where NIFTY trades at 22,600. You sell the weekly 22,600 call at ₹120 and buy the monthly 22,600 call at ₹250, so the position costs ₹130 to open. The weekly leg decays far faster than the monthly one. If NIFTY sits near 22,600 when the weekly expires, the sold call expires worthless while the monthly call still holds most of its value, and that difference is your profit.

Profit peaks near the strike at the weekly expiry and falls away on either side, with breakevens at roughly 22,186 and 23,031.

What are the risks?

A large move in the underlying away from the strike reduces the strategy's effectiveness, since both options lose their time-value advantage. Changes in implied volatility can help or hurt, depending on direction. The strategy is sensitive to both time and volatility, making it more complex than simple directional trades.

Calendar spread at a glance

When traders use it

Traders use calendar spreads when they expect stability near a strike and favourable volatility. It is a way to harvest the difference in decay between two expiries, rather than betting on direction. Because it is volatility-sensitive, it rewards traders who understand how implied volatility behaves.

Stockk, run on Indira Securities, gives you access to calendar spread and other strategies in one place. Start by opening a demat account, then explore F&O tools and the Knowledge Center.

Futures and Options are leveraged products and carry a high risk of loss that can be more than the money you put in. This article is only for learning and is not a recommendation to trade in derivatives.

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