Understanding Dividend Risk: Basics and Examples

Most traders are aware of common risks associated with options, from time decay (theta) to assignment, but sometimes dividend risk slips under the radar.

Investors who trade options on stocks that pay cash dividends need to understand how these payments can affect options prices, exercise, and assignment—or risk having their trading strategies derailed.

Dividend risk in options is the risk that a short call will be assigned early—before the underlying stock's ex-dividend date—if the long call holder opts to exercise the position to capture the dividend. This early assignment forces the option seller to deliver the underlying shares at the strike price and effectively pay the dividend amount to the buyer.

Dividend risk is more pronounced for in-the-money (ITM) calls, though it can also arise with at-the-money (ATM) or out-of-the-money calls in some cases. Traders should consider dividend risk when using any strategy that involves a short call component, including covered calls, vertical spreads, iron condors, and more. However, dividends have a broad impact on options pricing, meaning they can influence traders' strategies even when a short call isn't involved.

Before jumping into the mechanics of dividend risk and dissecting some examples, it's important to understand how dividends affect stock and options prices.

First, all else being equal, the price of a stock that pays a cash dividend will drop by the amount of the dividend on the ex-dividend date. An investor must own a stock before the ex-dividend date to receive its upcoming dividend payment.

For example, suppose a stock trading for $50 per share declares a $0.50 dividend. On the ex-dividend date, stock exchanges will automatically adjust the stock's opening price to $49.50 ($50 minus the $0.50 dividend).

From a shareholder standpoint, it's simply an even swap—$50 in stock for $49.50 in stock plus $0.50 in cash. However, option traders have more to consider since they are not entitled to dividend payments. Call and put option prices must account for the stock's decline in value, so the markets adjust accordingly in the weeks and months leading up to the ex-dividend date.

Put options generally become more expensive because these options profit from declines in the underlying stock's price, and as previously mentioned, the underlying stock's price drops by the amount of the dividend on the ex-dividend date. Conversely, call options—which profit from a rise in the underlying stock's price—become cheaper because of the anticipated price drop in the underlying stock.

Long call holders often exercise ITM options prior to a stock's ex-dividend date to purchase the underlying shares and capture the dividend. This is what creates dividend risk for short call holders.

However, this only applies to American-style options, which may be exercised at any time before the expiration date. Dividend risk does not come into play with European-style options, which can only be exercised on the expiration date.

Let's walk through a few examples that demonstrate why long call buyers often decide to exercise their ITM options prior to ex-dividend dates. Suppose ZYX is trading at $50, a trader is long the 40-strike call option that expires in one week, and ZYX is expected to pay a $0.50 dividend tomorrow.

The call option is deep ITM, so it should have an intrinsic value of $10 (stock price minus strike price) and a delta at or near 1.0. (Remember the multiplier: One standard options contract represents 100 shares of the underlying stock). As a result, the options contract has some similar price-risk characteristics to 100 shares of stock.

Once the stock goes ex-dividend, its price falls from $50 to $49.50, and the owner of record gets the $0.50 dividend. With the stock at $49.50, the call option's intrinsic value is reduced by that same $0.50, but the call option holder isn't entitled to the dividend.

To potentially avoid some of the $0.50 reduction in the value of their long call option and receive the dividend, a trader may choose to exercise the option (and become the owner of the stock) rather than continuing to hold it. This creates early assignment risk for the short call holder on the other side of the trade.

This doesn't account for any contract fees or transaction costs, which may influence the long option holder's decision. Still, with a deep ITM option, it's easy to see why early exercise might make sense. But are there other options that might be good candidates for early exercise when the underlying stock pays a dividend?

The answer lies in an options contract's extrinsic value, also known as its "time value" or "time premium." Options prices are composed of two components: intrinsic value, the amount by which an option is ITM, and extrinsic value, or the value over and above its intrinsic value based on the amount of time until expiration, the stock's implied volatility, and other factors.

When traders exercise a standard call, they receive 100 shares of the underlying stock for each contract at the strike price, but they forgo any remaining extrinsic value in that call.

Let's look at another example using ZYX. Suppose the 45-strike call is trading for $5.10. With the stock at $50, that would mean there's $5 in intrinsic value and $0.10 of extrinsic value. In this case, exercising the call would cost $0.10 in forgone extrinsic value but entitle a trader to the $0.50 dividend, so it may still be worth exercising early if contract fees and any other transaction costs are low.

Essentially, any long call option that has extrinsic value of less than the dividend amount (minus fees and transaction costs) might be a candidate for early exercise.

On the other hand, suppose a trader is long the 48-strike call and it's trading for $2.60 (with the stock still at $50). This would represent $2 in intrinsic value and $0.60 of extrinsic value. In this case, exercising the call would cost more in lost extrinsic value ($0.60) than would be gained from the dividend ($0.50).

It's important traders pay attention to long ITM call positions so they can consider strategically exercising calls before the ex-dividend date. But if they're short ITM calls on a stock that's about to go ex-dividend, they might want to pay even closer attention to avoid unexpected early assignment.

One way traders can estimate whether assignment is more likely is to look at the extrinsic value of the corresponding put. According to put-call parity, a put and a call of the same strike and expiration date will have roughly the same amount of extrinsic value. And, again, any option that has an extrinsic value of less than the dividend amount might be a candidate for early exercise.

This means if a trader is short an ITM call and the extrinsic value of the corresponding put is less than the upcoming dividend, the trader is more likely to be subject to early assignment.

In this situation, a trader might consider avoiding early assignment ahead of a dividend by either buying back the call option or rolling it to another option, such as a higher strike call or a call with a later expiration date—assuming liquidity, measured by the bid/ask spread, makes this economically efficient.

While traders using short calls as part of their strategies are the ones facing dividend risk, all traders should understand how dividends shape options prices. Whether buying a call or trading spreads, if the underlying stock pays a dividend, it will impact the strategy and must be accounted for.