An option spread is a term for any combination of long and short options for the same underlying asset, but with different strike prices and sometimes even different expiration dates between both the long and short options.

Each option within an option spread is typically referred to as a leg of the spread. So an option spread would have at least two legs.

## Credit and Debit Option Spreads

There are several ways to categorize option spreads. Let’s start with the most basic terminology first, which are credit and debit spreads. The focus here between these terms is the price of a spread, which can be easily calculated by summing up the prices of each option within the spread.

An option spread with a negative price is called a debit spread and requires an investment to establish the position. In contrast, a credit spread is an option spread with a positive price, leading to the receipt of funds upon opening the position.

For example, let’s say you buy to open a call option for \$20 and sell to open a separate call option for \$5. This results in a debit of \$20 (you paid \$20) and a credit of \$5 (you received \$5). The sum equals to a debit of \$15. So this would be a debit spread that costs \$15 to open.

## Call and Put Option Spreads

An option spread that only consists of call options is called a call spread. These can come in debit or credit formats, which are also called bull and bear spreads, respectively.

Conversely, a spread made up of only put options is called a put spread. It’s worth noting that the terms for bull and bear spreads are flipped when it comes to puts since they are the opposite of calls. A credit put spread is actually a bull put spread, while a debit put spread is a bear put spread.

## Vertical, Horizontal, and Diagonal Spreads

For the next set of option spreads, we’ll assume that the number of long options equal the number of short options and we’ll take a look at the selection of strike prices and expiration dates. This way of categorizing spreads includes vertical spreads, horizontal spreads, and lastly, diagonal spreads.

Vertical spreads are option spreads that have the same expiration date, but different strike prices between the long and short options.

Vertical spread = different strike prices, same expiration date

Horizontal spreads, called calendar spreads as well, refer to option spreads with the same strike price but different expiration dates between the long and short options. The name “calendar spread” comes from the emphasis on the time element with different expiration dates.

Horizontal spread = different expiration dates, but same strike prices

Lastly, diagonal spreads are those that are constructed with options that are different in both strike prices and also expiration dates.

Diagonal spread = different strike prices and different expiration dates

What happens if the number of long options don’t match the number of short options in a spread? Well, you’ll end up with an uneven spread. When there are more short options then long options, the spread is called a ratio spread and when there are more long options than short options, the spread is instead called a back spread.

Ratio spread = # short options > # long options

Back spread = # long options > # short options

So far, all of the above spreads, except the calendar spread, can also be considered as directional spreads.

A directional spread is one that is opened on the premise of the underlying asset moving in a particular direction, whether that be up or down. One example is a bull call spread, which profits when the price of the underlying asset rises. So the desired direction in this case is upwards.

Option spreads can additionally be structured in such a way that they don’t depend on the underlying asset moving in a particular direction. These spreads, called non-directional or direction agnostic spreads, are not affected by the movement of the underlying asset and can achieve optimal outcomes regardless of which direction the asset moves.

Some non-directional spreads that work well when the price of an underlying asset does not change much and stays within a small range include calendar spreads, iron condors, butterfly spreads, etc. Non-direction spreads that work best with movement of the underlying asset’s price include straddles, strangles, reverse iron condors, etc.

A straddle is a combination of an equal number of long calls and long puts with the same expiration dates and an identical strike price.

Straddle = long call, long put, same strike price, same expiration date

Since this consists of both a long call and a long put, the result is a setup where you have a chance to profit regardless of which direction the underlying asset moves (either up or down). A scenario where one might open a straddle is when one expects an underlying asset to change in price, but isn’t sure which direction the price of the asset will move. The caveat is that the price of the asset needs to move enough so that the loss witin the option in the opposite direction can be overcome.

For example, let’s say you open a straddle and the price of the underlying asset rises. As a result of the rise in price of the underlying asset, the long call also rises in value, but the long put falls in value. In order to actually make a profit on the straddle, you would need the profit from the long call ot be larger than the loss on the long put. The farther the price of the underlying asset moves away from the center of the straddle, the more likely the profit on one side will be larger than the loss on the other side and result in an overall profit on the straddle.

A strangle is similar to a straddle in that it consists of an equal number of long calls and long puts with the same expiration dates, but the strike prices will be different with the long call having a higher strike price than the long put.

A butterfly spread is the opposite of a straddle with an equal number of short calls and short puts with the same expiration date and strike prices. The profit and loss outcomes are reversed as a result. Butterfly spreads are opened on the premise that the price of an underlying asset will not change much over a period of time.

## Iron Condors

An iron condor consists of the combination of a bear call spread (in other words, a credit call spread) and a bull put spread (in other words, a credit put spread). With the bear call spread, you want the price of the underlying asset to fall while with the bull put spread, you want the price of the underlying asset to rise. These might seem contradictory at first glance, but it works out because the point of an iron condor setup is to wager that the price of the underlying asset stays within a narrow range between the two spreads.

Both spreads are opened for a credit and thus an iron condor is opened for a credit. In other words, you receive money for opening an iron condor.

Ideally, the price of the underlying asset will remain between the two spreads until all options in the iron condor expire worthless so that you can keep the full credit from when you opened the two spreads of the iron condor.

Remember, options will typically lose value as the expiration date approches. An iron condor is opened via a credit so it has a positive value when opened. As time progresses towards the expiration date, assuming nothing else has changed, the value of the iron condor will fall. This then makes it possible for you to close the iron condor by paying a debit which is smaller than the initial credit you received.

An iron condor can also be reversed and is simply called a reverse iron condor. It’s usage is similar to that of a strangle with the only difference that the profit is capped. Similar to strangles, a reversed iron condor is opened on the premise that the underlying asset will undergo a large change in price whether that be up or down.