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Call Option Payoff


A call option payoff depends on stock price: a long call is profitable above the breakeven point (strike price plus option premium). The opposite is the case for a short call. A call option payoff diagram shows the potential value of the call as a function of the price of the underlying asset usually, but not always, at option expiration.

Below we’ll build up this payoff diagram – for both long and short call options – by considering the behaviour of a call option price at expiry with respect to its strike price.

 

Long Call Option Payoff

Let’s consider the simplest example: a long call option with, say, a strike price of 100 which expires in 3 months time. Suppose also that the stock price is at 90 at present. We hope that the stock will rise above 100 at expiry enabling us to exercise or sell the call as it will have value.

 

To purchase the call, an option premium must be paid which, all things being equal (especially implied volatility), depends on the time to expiry: 3 month in this case. Let’s say that this premium is 10.

 

At expiry one of these scenarios will occur:

 

The stock price is below the 100 exercise price (ie the option is out of the money)

In this case the trade has not worked as planned and the call option will expire worthless. The profit/loss is therefore:

  • Premium Paid: -$10
  • Profit from call option: $0
  • Loss on trade: -10
     

The stock price is between 100 and 110

The call option is in the money which is good news. Its value will be its extrinsic value – the stock price less the strike price – as there is no intrinsic value (option value from time remaining on the option).

 

However this amount will be small – between 0 and 10 – and higher the closer to 110 the stock price is.

 

However it will not be enough to recoup the 10 paid for the call option premium and hence a loss is still made.

 

Our profit/loss – assuming, say, a stock price of $105 is below:

  • Premium Paid: -$10
  • Profit from call option: $5
  • Loss on trade: -5

 

The stock price is 110

This is the option’s breakeven point.

 

At 110 the option will be worth $10 at expiry, recouping all the $10 option premium paid.

 

No profit or loss is made; the trader will break even:

  • Premium Paid: -$10
  • Profit from call option: $10
  • Profit/Loss on trade: $0

 

The stock price is over 110

This is where the trader starts to make a profit.

 

The expired option is now worth more than $10, thus more than recouping the $10 option paid.

 

So if, say, the stock price is 115:

  • Premium Paid: -$10
  • Profit from call option: $15
  • Profit/Loss on trade: $5

This profit will be larger the further the stock price is from the 110 strike price. It is potentially infinite (as the potential stock price is infinite, although this is unlikely).

 

Putting all this together for all possible stock prices gives the following payoff graph:

call option pay off diagram

The horizontal x-axis is the stock price at expiry.

 


Short Call Option Payoff

What if the trader had sold the call option rather than bought it, hoping that the stock would not rise above 100 and hence keep the 10 premium with no cost.

 

Let’s look at the scenarios again:

 

The stock price is below the 100 exercise price (ie the option is out of the money)

In this case the trade has worked as planned and the call option will expire worthless. The profit/loss is therefore:

  • Premium Received: $10
  • Loss from call option: $0
  • Profit on trade: $10
     

The stock price is between 100 and 110

The call option is in the money which is bad news. Its value will be its extrinsic value – the stock price less the strike price – as there is no intrinsic value (option value from time remaining on the option).

 

However this amount will be small – between 0 and 10 – and higher the closer to 110 the stock price is.

 

However it will not be enough to extinguish all the 10 call option premium received and hence a profit is still made.

 

Our profit/loss – assuming, say, a stock price of $105 is below:

  • Premium Received: $10
  • Loss from call option: -$5
  • Profit on trade: $5


The stock price is 110

This is the option’s breakeven point.

 

At 110 the option will be worth $10 at expiry, removing all the $10 option premium received.

 

No profit or loss is made; the trader will break even:

  • Premium Received: $10
  • Loss from call option: -$10
  • Profit/Loss on trade: 0
     

The stock price is over 110

This is where the trader starts to make a (potentially infinite) loss.

 

The expired option is now worth more than $10, thus more than recouping the $10 option paid.

 

So if, say, the stock price is 115:

  • Premium Received: $10
  • Loss from call option: -$15
  • Loss on trade: $5

Breakeven Point Calculation

As we have seen the breakeven point of either a long or short call option position is the expiry price at which neither a profit nor loss is made.

 

It can be calculated using the formula:

calculation of call option payoff breakeven point

 


Conclusion

A call option payoff is a function of the underlying stock’s price at expiration.

For a long/short position, a profit is made if this price is higher/lower than the breakeven point, calculated as the sum of the strike price and the option premium paid/received.

About the Author: Chris Young has a mathematics degree and 18 years finance experience. Chris is British by background but has worked in the US and lately in Australia. His interest in options was first aroused by the ‘Trading Options’ section of the Financial Times (of London). He decided to bring this knowledge to a wider audience and founded Epsilon Options in 2012.

 

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