Covered calls: the whole position, not just the premium

Selling a call against stock you own puts money in your pocket today and gives something up tomorrow. Look at both halves, or the premium will look like free money when it is not.

Covered calls get sold, in the sales sense, as a way to "get paid to own stock." The payment is real. So is the thing you gave up to get it. Let me lay both on the table.

The setup

You own at least 100 shares of a stock. You sell one call option on those shares, choosing a price, called the strike, and a date. The buyer pays you a premium right now. In return you have promised to sell your 100 shares at the strike price if the buyer wants them, and they will want them if the stock is above the strike on the date. The shares are the "cover." Without them, the same sold call could lose you an unlimited amount.

A made up example

You hold 100 shares you bought at $50, now trading at $52. You sell a call with a $55 strike expiring in 30 days and collect $1.20 per share, or $120. Three ways it ends. If the stock stays below $55, the call expires worthless, you keep the $120 and the shares. If the stock is at $60, the buyer takes your shares at $55, and you walk away with $55 plus $1.20 per share, or $56.20, while the stock is worth $60. If the stock falls to $40, you keep the $120, but each share lost $12. The premium softened $1.20 of a $12 fall.

The whole position has a maximum gain of strike minus what you paid plus premium: $55 − $50 + $1.20 = $6.20 per share. The breakeven is what you paid minus premium: $48.80. The downside is the full value of the stock minus the premium, the same as just owning stock with a small discount. Above the strike, every dollar the stock climbs belongs to the buyer, not you. The payoff at expiration is the stock's payoff with the top sliced off.

Before expiration the position is worth something different from the expiration picture. A call with time left holds time value, so buying it back early costs more than its bare worth. Assignment can happen early on American style stock options, most often the day before a dividend when the dividend is worth more than the remaining time value. The calculator draws the expiration payoff only, and says so.

Costs and frictions

Commissions and per contract fees shrink the premium. The gap between the buying and selling price on options is wider than on stock, so the number you see quoted is not the number you get. If your shares get called away in a taxable account, you owe tax on the gain. Rolling a call, meaning buying back the current one and selling a later one, is two trades with two gaps to cross.

Where the tidy version goes wrong

Turning a 30 day premium into a yearly "yield" makes covered calls look like a stock with a huge dividend. They are not. The premium is payment for selling away your upside. Over many rounds, a covered call approach tends to fall behind plain stock ownership in strong rallies and pull ahead in flat or gently falling markets. Which world you are about to live in is not known in advance. Presenting the premium as income while ignoring the capped upside and full downside is the most common misunderstanding in retail options education.

Questions worth asking yourself

What is the most the whole position can make, and would you be content to sell at that strike? What is the breakeven? How wide is the bid ask gap, and what are your fees? Is there a dividend before expiration? What happens to your taxes if the shares go? And why is the premium the size it is? If the market expects a big move, you may be selling your upside on exactly the wrong day.

Sources

Written by one person and checked against the sources above; no outside expert has reviewed it yet. Rules and dollar limits change every year, so this guide explains how things work and sends you to the official source for this year's numbers.