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Bull Put Spread Option Payoff Graph

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by Gavin in Blog
October 18, 2020 3 comments

Contents

Today we’re going to look at the bull put spread option payoff graph. This is designed for beginners so they can develop a basic understanding how to read the payoff graphs.

We’ll look at:

  • The payoff graph at expiration and interim dates
  • How to calculate the breakeven price
  • How time decay will impact the payoff graph
  • How volatility will impact the payoff graph

A bull put spread is one of the easiest option trades and a great place for beginners to start their learning journey.

A bull put spread option is 2 contracts between a buyer and seller.

It is an options strategy that is used when the investor expects a moderate rise in the price of the underlying asset. At the very least, the trader is expecting that the stock will not drop too significantly.

The strategy uses two put options to form a range consisting of a high strike price and a low strike price.

Bull Put Spread Option Payoff Graph

Understanding payoff graphs (or diagrams as they are sometimes referred) is absolutely essential for option traders.

A payoff graph will show the option position’s total profit or loss (Y-axis) depending on the underlying price (x-axis).

Here is an example:

bull put spread option payoff graph

What we are looking at here is the payoff graph for a bull put spread option strategy.

In this example the trader has sold a $315 strike put and bought a $310 strike put for a net $0.96 per contract (or $96 for a standard option contract representing 100 shares).

The premium collected of $96 is the most the trade can profit. That occurs at an underlying stock price of $315 and above.

Below the strike price of $315, the line slopes downward until hitting $310 which is where the max loss is at expiration.

The lines crosses into loss at a certain point when the stock price falls below the breakeven point.

The breakeven point is simply the short strike price minus the premium collected. In this case it would be:

If the premium collected had been slightly higher at $1.50, then the breakeven price would be $313.50

Different Scenarios At Expiration

Four different scenarios can occur at expiration for a bull put spread trade.

  1. Underlying stock price is above the short strike price

This is the ideal scenario that the trader was hoping for. If the underlying stock price is above the short strike price at expiration, the bull put spread will expire worthless. The profit for the trade will be equal to the premium collected.

In our example, this would be $0.96 per contract or $96 in total.

The trader can either let the puts expire worthless or buy them back in the market for a profit.

  1. Underlying stock price is below the short strike price but above the breakeven price

If the stock is below the short strike price at expiration, the trader may think the trade has a loss, but unless it gets below the breakeven price, it will not end in a loss.

For example, let’s say the stock ends at $314.50.

The $315 strike short put option has $0.50 of loss and the short leg option will be assigned the underlying shares.

The $310 strike long leg option will expire worthless.

But, the $0.50 of loss is less than the $0.96 collected, so in this scenario, even though the short put option has a loss at expiration, the trader has profit $0.46 per contract.

  1. Underlying stock price is below the breakeven price but above the long strike price

If the stock is below the breakeven price at expiration, the trader may think the position has a max loss, but unless it gets below the long strike price, it will not end in a max loss.

For example, let’s say the stock ends at $313.

The $315 strike short put option has $2 of loss and the short leg option will be assigned the underlying shares.

The $310 strike long leg option expired worthless

But, the $2 of loss is less than the max loss of $5 minus $0.96 collected, so in this scenario, even though the short put option has a loss at expiration, the trader has loss of only $1.04 per contract compared to max loss of $4.04.

  1. Underlying stock price is lower than the long put price

If the underlying stock price is below the long strike price at expiration, the bull put spread will be in the money for both strikes.

The loss for the trade will be equal to the width of the strike minus premium collected.

In our example, this would be $4.04 per contract or $404 in total.

The good thing about a bull put spread is that the loss is limited to the width of the spread minus premium collected, so it doesn’t matter how low the stock goes, the most the trader can lose is the $404 in this example.

Payoff Graph At Interim Dates

So far, we’ve only considered the payoff graph at expiration. The payoff graph at interim dates will look very different and will be impacted by factors such as time decay and implied volatility.

Calculating the profit and loss at expiration is quite simply, using excel or even in your head if you are half decent at maths.

Calculating profits and losses at interim dates is much more complex and requires more advanced software than just Excel.

Any decent options broker will have the ability to show option profits and losses at interim dates.

The below bull put spread option payoff is from Interactive Brokers.

The bull put spread option was an AAPL 100/95 strike put sold for $0.50 per contract or $50 in total. The breakeven price at expiration is $99.50 (short strike price minus the premium collected).

The blue line shows the expiration payoff that you are now familiar with and the purple line shows what is known as a “T+0” line.

T+0 simply means, what does the trade look like as of today?

Notice that the breakeven price as of today is the current AAPL price. This makes sense because we just sold the put spread so wouldn’t expect to have made or lost any money yet.

bull put spread graph

Notice also that losses occur much before the expiration breakeven price and above 100, the profits are not the maximum profit.

As time goes by, the interim line slowly moves towards the expiration line.

Here’s how the payoff diagram is estimated to look at one week before expiration.

bull put spread diagram

See how the purple line is now much closer to the expiration payoff line?

Most brokers will be able to provide this sort of graphical information for you.

I also like to use Option Net Explorer because they can show multiple interim date lines.

Looking at the payoff graph below, notice that there are three interim lines – T+0, T+11 and T+22. This gives the trader a good appreciation of how the trade will progress over time after 11 days and 22 days.

options bull put spread

How Changes In Volatility Impact The Payoff Graph

Changes in implied volatility will not have any impact on the payoff graph at expiration, but it will impact the interim dates.

A bull put spread strategy has negative vega, meaning that it will benefit from an decrease in implied volatility after placing the trade.

This AAPL trade example has vega of -2 which means that for every 1% drop in implied volatility, the trade will make $2 with all other factors being equal.

The opposite is true if implied volatility rises.

Let’s take a look at how a 20% drop in volatility impacts the interim lines.

Notice that the expiration line hasn’t changed at all, but the interim lines have all moved higher.

bull put spread payoff

Now, let’s see how the diagram changes assuming a 20% rise in volatility. All the interim lines have dropped significantly.

bull put spread option payoff

With a bull put spread strategy, delta is the main driver of the trade, but we can clearly see that big changes in implied volatility will also affect the trade.

Bull Put Spread Option Payoff Summary

You should now be intimately familiar with the bull put spread option payoff graph. Let’s summarize some key points.

  • Bull put spread options are a bullish strategy with limited risk and limited upside
  • The maximum loss is equal to the width of the strikes minus premium collected
  • The breakeven price is equal to the short strike price minus the premium collected
  • The position will gain value as expiration approaches due to time decay provided the stock is above the sold put
  • Below the long put time decay begins to hurt the trade.
  • As a negative vega trade, decreases in implied volatility will help the trade, but only at interim dates

If you’re still having trouble or want to learn more about these concepts, you can check out this 12,000 word beginners guide to options.

Trade safe!

Disclaimer: The information above is for educational purposes only and should not be treated as investment advice. The strategy presented would not be suitable for investors who are not familiar with exchange traded options. Any readers interested in this strategy should do their own research and seek advice from a licensed financial adviser.

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3 Comments
  1. John says:

    So I’ve been having very good returns with bull put spread. I try to make my bets, that in worse case scenario I loose 10k. The thing is that, if I had started this in March 2020, I would have lost so much.

    So for now it’s Ok, but when the next crisis come and I have let’s say 5-10 bets open and they all loose 10K, I don’t know how to tackle that. Any ideas?

    1. Gavin says:

      Are you using a stop loss? What delta are you starting the short strikes at?

      1. John says:

        Usually equally distant the delta of both options(I’m using a website which suggest best trades, barchart). My stop loss is the lower barrier of the bull put spread. My european platform is too uncomfortable for setting up stop losses.

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Options Trading 101 - The Ultimate Beginners Guide To Options

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