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A reverse calendar spread is an options trading strategy where you buy a short-term option and simultaneously sell a long-term option on the same underlying asset at the same strike price. It is the direct opposite of a standard calendar spread. You profit when the underlying asset moves significantly in either direction before the near-term option expires, and when implied volatility in the short-term option is higher than in the long-term option.
Think of it like betting that a fire will happen soon, while someone else bets it will happen eventually.
To set up a reverse calendar spread, you choose a strike price and two expiration dates. You buy the near-term option and sell the far-term option. Because far-term options carry more time value, the option you sell is typically worth more than the one you buy. This creates a net credit when you open the position.
The maximum profit is that initial net credit, collected if the near-term option expires exactly at the strike price and the short-term option's value decays faster than the long-term option's value. The maximum risk occurs if the underlying asset makes a large sustained move in one direction before the near-term option expires, because you remain short a long-dated option after the near-term leg disappears.
Traders use reverse calendar spreads in two specific situations. First, when they expect a large price move in the underlying asset before the near-term expiration, such as ahead of an earnings announcement or a major economic report. Second, when short-term implied volatility is elevated relative to long-term implied volatility, and they expect that gap to narrow quickly after the event passes.
After a major event like an earnings release, implied volatility typically collapses rapidly because the uncertainty is resolved. This volatility crush benefits the reverse calendar spread because the short-term option loses value faster than the long-term option you sold.
The profit and loss profile of this strategy is measured at the expiration of the near-term option, not the far-term one. At that point, you close the position or accept the consequences of being short a naked long-term option.
Three scenarios define the outcome:
Most traders who use reverse calendar spreads close the position before the near-term option expires rather than holding to expiration. Waiting until expiration and leaving the short long-term option open creates unlimited risk if the underlying asset moves sharply afterward.
Closing early captures most of the available profit while eliminating the exposure from the remaining short option. This is the standard risk management practice for this strategy, particularly given the large margin requirements brokers impose on naked short long-term options.
You can build a reverse calendar spread with either put options or call options. Choosing between them depends on your directional view. A reverse calendar call spread makes the most sense if you expect the underlying to move higher before the near-term expiration. A reverse calendar put spread makes sense if you expect a decline.
The strategy is not purely directional. A large move in either direction from the strike produces a profit. But your choice of puts or calls slightly tilts the position toward a bullish or bearish bias in how the payoff curve is shaped at expiration.
The reverse calendar spread has large margin requirements. Selling a long-dated option naked, even as part of a spread, requires substantial capital held in reserve as collateral. Most retail brokerage accounts require options trading approval at a higher level to execute this strategy.
Institutional traders and hedge funds use this strategy more frequently because they have the margin capacity and the sophisticated risk management systems to monitor the position in real time. For individual traders, the cost of the margin requirement and the risk of being left short a long-term option at expiration make this a more complex strategy than most alternatives.
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