Theta Value of Options Part 1 :D

In this article we try to discuss how time decay affects option pricing over time, though it is considered a significant risk factor, understanding the dynamics of time decay in option itself may reveal how to use it for incurring profits. As we  already know, most options have  a limited life span, i.e. till its expiration date. The option expiration date is the date after which the option contract becomes void and right to exercise it no longer exists. For all stock options listed on the National Stock Exchange, the expiration date falls on the last Thursday of the expiration month (except when that Thursday is a holiday, in which case it will be brought forward by one day to Wednesday).


Not only do options expire on the set expiration date they also keep loosing their value over time. This phenomenon of loosing time value overtime is called time value decay. The risk related to time value decay of option price can be hedged by choosing options which are to expire in more distant months, where there is longer time remaining to expiration. This can slow down the rate of decay but one has to pay higher premiums on forward month options, which subjects it to higher Delta risk of more loss from wrong-way price movement and higher Vega risk which can arise from adverse changes in volatility.


.The graph displayed here clearly shows that keeping volatility and price of the underlying constant, for the same At-The-Money strike of Nifty 5400 Call, for different expiry months the premium increases as the time remaining to expiration increases. For September expiry, when there are 69 days remaining to expiration the premium is `211, as we move towards August expiry the premium has decreased to `143.20 as only 34 days are left to expiration. Finally comparing it with present month expiry of July the Premium is lesser at `69.15 when there are 6 days remaining to expiration (which also includes some intrinsic value).


The premium or the option price paid to acquire any option has two components: intrinsic value and time value (also known as extrinsic value). The intrinsic value depends on the moneyness of the option. Only if the option is In-The-Money it will have intrinsic value. At-the-money options and Out-of-the-money options have no intrinsic value. The second component of the option premium is time value, the time value depends upon the length of time remaining to exercise the option, the moneyness of the option, as well as the volatility of the underlying’s market price. In case of In-The-Money options, the time value decreases as the option goes deeper into the money, for Out-of-The-Money options, as they have no intrinsic value, time value is the same as option price.


Wait for the final part 😀


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