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Since an option is a depreciating asset, meaning it has a limited life, the extrinsic value in the option will wither away daily until expiration. This “decay” is not a linear function meaning it is not equally distributed between all of the days to expiration.
As the option gets closer to expiration, the daily rate of decay increases and continues to increase daily until expiration of the option. At expiration, all options in the expiration month, calls and puts, in-the-money and out-of-the-money must be completely devoid of extrinsic value as noted in the time value decay charts below.
This is like a boulder rolling down a hill. The further it goes down the hill, the more steam it picks up until the hill ends.
By selling the option and owning the stock, the covered call seller captures the extrinsic value in the option by holding the short call until expiration.
As mentioned earlier, an option’s loss of extrinsic value over its life is called time decay. In the covered call strategy the option’s time decay works to the seller’s advantage in that the more that time goes by, the more the extrinsic value decreases.
We have now seen how a covered call strategy is constructed and how it is supposed to work. Keep in mind that the trade can be entered into in two ways. You can either sell calls against stock you already own (Covered Call) or you can buy stock and sell calls against them at the same time (Buy Write).
You own 1000 shares of Oracle at $9.50.
The stock has been stuck around this level for a long time now and you have grown impatient. You finally give in and sell the front month (November for example) at-the-money calls. The at-the-money calls would have a strike price of $10 if the stock was trading at $9.50.
You sell the calls at a $.50 premium per contract which creates a $10.50 breakeven point. Remember, in a buy-write, the breakeven point is the strike price plus the option premium. Let’s look at what our returns will be in each of the three scenarios.