Selling Options vs. Exercising Options

When you own an option, you have two choices: exercise it or sell it. The decision hinges on whether you want to convert the option into the underlying stock or capture its market value. When you exercise an option, you convert it into the underlying stock (for calls, you buy; for puts, you sell), but you forfeit any remaining extrinsic value — the “time value” and volatility premium built into the option’s price. By contrast, if you sell the option (close your position), you capture both its intrinsic value (the in-the-money amount) and its extrinsic value (what someone else is willing to pay for the time and volatility left until expiration).

Example: Suppose you own a call option on Apple (AAPL) with a $150 strike, expiring in a month, and the stock trades at $160. The option trades at $13:

Intrinsic value

$\$160-\$150=\$10$

Extrinsic value

$\$13-\$10=\$3$

If you exercise: You get $10 per share (the in-the-money amount), but lose the $3 extrinsic value. If you sell: You get the full $13 per share—maximizing your return.

Unless you specifically want to own the stock (e.g., for dividends or long-term holding), sell the option instead of exercising it early. This is especially true for American-style options before expiration, since selling preserves the full market value — including extrinsic value that exercise simply discards. There are only three situations where early exercise is rational:

Capturing a dividend on a call

Exercise a deep-in-the-money call the day before the ex-dividend date when the dividend exceeds the call’s remaining time value. The stock drops by roughly the dividend on the ex-date, and the call does not pay it to you.

Interest on the proceeds of a put

A deep-in-the-money American put can be worth exercising purely for the time value of money: exercising converts your position into cash today, and the interest earned on the strike proceeds between now and expiration can exceed the put’s remaining extrinsic value. This is the mirror image of the dividend case and is why deep ITM American puts can trade below intrinsic value.

Negligible extrinsic value

Right before expiration, deep in the money, where there is nothing left to forfeit.

Both of the first two cut the other way when you are short the option: if you have written a call into a dividend or a deep put into a high-rate environment, expect early assignment and plan for it instead of being surprised by the position appearing in your account overnight.

On a stock that pays no dividend, the first exception cannot arise, and the guidance hardens from a rule of thumb into a theorem: early exercise of an American call is never optimal,¹³⁷ which is why such a call is worth exactly what its European twin is worth. Two forces beyond the forfeited time value drive the result. The first is the strike. Exercising hands over $K$ today instead of at expiration, so you surrender the interest on the strike for the option’s remaining life — formally $C\ge S-K{e}^{-\mathit{rT}}>S-K$ at any positive rate, where $C$ is the call’s price, $S$ the current stock price, $K$ the strike, $r$ the risk-free rate, and $T$ the time to expiration — so the call is worth more alive than the intrinsic value you would collect by killing it. That is the deep-in-the-money put argument above, run in reverse. The second is insurance. While you hold the call your downside is the premium you paid; exercise converts it into stock and hands you the entire drop below the strike. Both survive even when the quoted extrinsic value looks like a rounding error, which is why the third exception above is really a statement about transaction costs, not about exercise being worth anything.

The corollary is the part people get wrong when they genuinely do want the shares: still do not exercise. Sell the call and buy the stock in the open market. You end up holding the same position, except you have collected the extrinsic value instead of donating it to whoever is short.