A debit spread is a popular options trading strategy employed by investors who want to limit both their potential risk and potential profit. It involves opening two options positions simultaneously: buying one option and selling another option of the same type (either both call options or both put options) on the same underlying asset with the same expiration date. The key characteristic of a debit spread is that the premium paid for the option bought is higher than the premium received for the option sold, resulting in a net debit to the trader's account. This initial cost represents the maximum potential loss for the strategy.
For a bull call spread, a trader buys a call option at a lower strike price and sells a call option at a higher strike price. Both calls have the same expiration date. The expectation is for the underlying asset's price to increase. The net debit paid is the maximum risk, and the maximum profit is the difference between the strike prices minus the net debit. Conversely, a bear put spread involves buying a put option at a higher strike price and selling a put option at a lower strike price, both with the same expiration. This strategy is used when a trader anticipates a decrease in the underlying asset's price. Again, the net debit is the maximum risk, and the maximum profit is the difference between the strike prices minus the net debit. Debit spreads are valued for their defined risk profile, making them attractive to traders who prefer knowing their maximum losses upfront.
The primary benefit of a debit spread is its defined risk. Traders know the maximum amount they can lose when entering the trade, as it is limited to the initial net debit paid to establish the spread.
For a debit spread, the maximum profit is typically calculated as the difference between the strike prices of the two options, minus the net debit paid to enter the spread. This represents the absolute maximum gain possible if the underlying asset moves favorably past the higher (for calls) or lower (for puts) strike price at expiration.
Debit spreads can be suitable for volatile markets, especially if a trader has a strong directional bias. Because the risk is defined, they can participate in significant moves while keeping potential losses contained, unlike selling naked options which have undefined risk.