What Is a Covered Call, and What Can an Alert Check for You?

Published Oct 26, 2026

A covered call combines two positions: shares of a stock that you own, and a call option on those shares that you sell. The shares "cover" the call, because if the buyer of the call exercises it, you already have the shares you would have to deliver.

This article explains how the combination works, what it trades away, and which parts of it an alert can keep track of for you. It describes a strategy; it does not say whether the strategy suits you.

The pieces

A call option gives its buyer the right, but not the obligation, to buy shares at a fixed price, the strike, until the option's expiration date. The buyer pays the seller a price for that right, the premium.

When you sell a call on shares you own:

• you receive the premium when the sale goes through, and keep it whatever happens next;
• you take on the obligation to sell your shares at the strike if the call is exercised;
• you still own the shares, with everything that comes with them, until they are sold.

One option contract usually covers 100 shares, but not always: contracts adjusted after a split or a merger can cover a different number, the contract multiplier.

What can happen at expiration

What a covered call leads to depends on where the stock is relative to the strike.

• The stock stays below the strike. The call is usually left to expire. You keep the premium and the shares, and you can decide again what to do next.
• The stock rises above the strike. The call is likely to be exercised, and your shares are called away: sold at the strike. You keep the premium, but you give up any rise above the strike.
• The stock falls. The call expires, you keep the premium, and the shares are worth less. The premium offsets only part of a fall.

U.S.-listed stock options can generally be exercised before expiration, so assignment can come early, for example around a dividend.

The trade-offs

A covered call exchanges part of a stock's possible rise for the premium received now. Three trade-offs follow from that:

1. Upside is capped at the strike, plus the premium, for as long as the call is open.
2. Downside stays. You still carry the risk of a fall in the shares, reduced only by the premium.
3. The shares are committed. While the call is open, selling the shares without dealing with the call first changes the position into something else.

A strike further above the stock price usually brings a smaller premium and more room for the stock to rise before it is capped. A nearer expiration usually brings a smaller premium per contract, and a decision point sooner. The choice between them is the investor's.

Measuring the premium

Premiums for different strikes and expirations are hard to compare by their price alone. One common measure is the annualized return: the premium as a share of the capital it relates to, scaled to a one-year basis.

OpScout works this out itself, at the bid, the price at which a sold option is valued:

• capital is the stock price less the bid;
• the interval return is the bid divided by that capital;
• the annualized return is the interval return times 365, divided by the days to expiration.

For a covered call it also works out the annualized return if the shares are called away: the bid plus the strike less the stock price, divided by the capital, annualized the same way. Annualized return, explained.

These figures leave out commissions, fees, taxes, dividends and early assignment, and they assume a result could be repeated, which is not guaranteed. They are estimates, not forecasts.

Where an alert fits

Checking calls by hand means opening an option chain, picking out the strikes and expirations that fit your rules, and working out returns, for every stock you follow, every time you want to know. A Covered Call alert does that checking on a schedule and tells you when a call meets the conditions you set.

In OpScout, a Covered Call Monitor takes:

• the stock;
• a strike rule: a minimum out-of-the-money distance, a preset range, or a strike you enter (only calls that are out of the money are considered);
• an expiration rule: a range of days to expiration, inclusive at both ends, or the exact dates you pick;
• a minimum annualized return, at the bid;
• optionally, an implied volatility range, a maximum in-the-money probability, and a price or market cap range for the stock.

OpScout checks the Monitor about every 15 minutes during the U.S. regular trading session. When calls match, the Alert names the first by a published ordering, the highest annualized return at the bid first, and counts the rest. That order is a sorting rule, not a recommendation. Ranking.

OpScout does not check whether you own the shares, does not connect to your brokerage account and does not place trades. What you do after an Alert is always your decision.

In short

• A covered call is owned shares plus a sold call on them.
• It trades part of the possible rise for a premium now, and keeps the risk of a fall.
• An alert can watch for calls that meet your strike, expiration and return conditions, so you do not have to check the chains yourself.

Set up Covered Call alerts · Glossary