How to Sell a Covered Call: A Comprehensive Guide

To sell a covered call, you own at least 100 shares of a stock and sell one call option against them, collecting the premium immediately. If the stock stays below the strike price at expiration, you keep both the shares and the premium. If it rises above the strike, your shares are sold at that price and you still keep the premium. It is the most common way to generate income from stocks you already own.

The mechanics take five minutes to learn. The part that decides whether covered calls actually pay you is the strike you pick, and that is where most people guess. I traded derivatives professionally for 22 years, and this guide gives you the exact strike rule I use, why I do not sell deep in-the-money calls for income, when to roll, and the risks that catch new sellers out.

What is a Call Option?

To understand how to sell a covered call, we first need to know what a call option is. A call option gives the buyer the right, but not the obligation, to buy a stock at a specific price (the strike price) before the option expires. As the seller (or "writer") of the call option, you are obligated to sell the stock at the strike price if the option is exercised.

For beginners, buying a call option is a way to profit from a stock's upward movement. Selling a call against stock you already own flips that around: you are paid now in exchange for agreeing to sell at the strike, which suits a stock you expect to drift sideways or rise gradually.

How Selling a Covered Call Works

The covered call strategy involves two key components:

1. Owning the underlying stock: You must own at least 100 shares of the stock you're selling the call option against. This is what makes it "covered." If you don't own the stock, then the call is considered "naked," which carries much higher risk.
2. Selling the call option: Once you own the stock, you sell a call option at a specific strike price and expiration date. In return, you receive a premium (the price paid by the buyer of the call).

If the stock price rises above the strike price, the buyer of the call option may choose to exercise their option, and you'll be required to sell your stock at the agreed-upon strike price. If the stock stays below the strike price, the option expires worthless, and you keep the stock and the premium you received for selling the option. The Options Industry Council's covered call guide walks through the full payoff if you want the textbook version.

The Risk and Reward of Selling Covered Calls

Like any trading strategy, selling covered calls comes with both benefits and risks. Understanding these can help you decide if this strategy aligns with your investment goals.

How Do You Choose a Strike Price for a Covered Call?

Every strike on the option chain is a trade-off between income today and room for the stock to rise. Sell too close to the stock price and you collect more, but the shares get called away sooner. Sell too far out and you keep the upside, but the premium is so small the trade is barely worth placing. Most people solve that by picking the biggest premium or a round number that looks right. I use a rule instead.

My Rule: Sell the 30 Delta Call, About 30 Days Out

Here is the whole rule: look about 30 days to expiration and sell the call strike closest to 30 delta. If the chain shows 0.28 on one strike and 0.33 on the next, take the one nearest 0.30, as long as you would genuinely be comfortable selling your shares at that price.

Delta tells you two useful things. First, price sensitivity: a 30 delta call moves roughly 30 cents for every $1 the stock moves. If a stock is at $52 and you sell the $55 call for $0.50 at 30 delta, a $1 rise in the stock pushes that call to roughly $0.80. Second, a rough probability: a 30 delta call has about a 30% chance of finishing in the money, which means about a 70% chance it expires worthless and you keep the full premium and your shares. It is an estimate, not a promise. And keeping the premium is not the same as making money: if the stock falls, the premium only offsets part of the drop in your shares.

I did not pick 30 delta because it is a round number. Over my 22 years trading derivatives, we backtested the alternatives: 10, 15, 30, 40, 45 and 50 delta. We even tried adjusting the strike stock by stock based on how much upside we thought each one had left. Thirty delta kept winning. It produced the best balance of premium collected and room for the stock to run, and it beat every attempt to be clever. A backtest is not a guarantee of future results, but it is why I start every trade there.

What Goes Wrong When You Go Too Aggressive or Too Conservative

Too aggressive (40 to 50 delta): the premium is bigger, but your upside gets capped fast. The stock rallies, your call goes in the money, and you watch the shares keep climbing without you. The trade can still be technically profitable and feel like a loss, because you gave away far more upside than the premium paid you for.

Too conservative (10 to 15 delta): the stock has plenty of room, but you collect so little that the trade does not justify the work. You still have to check the chain, place the order, watch earnings and dividend dates, and manage the position. Then the one month the stock does spike, you sold it for almost nothing. Over time those strikes simply returned less in our testing.

A strike that feels safer is not automatically a better trade. The goal is not to avoid every chance of assignment. The goal is steady income at a balance you can repeat every month, and the covered call calculator will show you what any strike actually returns before you sell it.

Should You Sell Deep In-the-Money Covered Calls?

A deep in-the-money covered call has a strike well below the current stock price, usually with a delta of 0.80 or higher. The premium looks enormous, which is why people search for it. The catch is what that premium is made of.

Every option premium has two parts. Intrinsic value is how far the call is already in the money. Time value is everything above that, and time value is the only part you actually earn as a seller. On a deep in-the-money call, nearly all of the premium is intrinsic value.

Say a stock trades at $100 and you sell the $85 call for $16. Fifteen dollars of that is intrinsic value: the call is already $15 in the money. Only $1 is time value. If the shares are called away, you receive $85 plus the $16 premium, which is $101. Your real income is that $1, about 1%, and in exchange you gave up every dollar of upside above $85 and made assignment close to certain.

What you do get is a big cushion. The stock can fall to about $84 before you lose money. That is why some traders use deep in-the-money calls defensively, or as a way to get paid a little extra to exit a position they already want out of. That is an exit tool. It is not an income strategy, and it is the same mistake as selling 45 or 50 delta, taken to the extreme. For stocks I want to keep collecting income on, I do not sell them.

There is one more cost. In-the-money calls are the ones most likely to be assigned early, and the risk peaks right before an ex-dividend date: when a call's remaining time value is smaller than the upcoming dividend, the buyer has a reason to exercise early and collect the dividend instead of you. The Options Industry Council flags exactly this risk for covered call writers. If you sell deep in the money on a dividend stock, expect to lose the shares, and the dividend, sooner than you planned.

When Should You Roll a Covered Call?

My trigger is 70 delta. When the stock rallies and your short call reaches about 70 delta, it is meaningfully in the money and very likely to finish there. At that point I buy it back and sell the next 30-day, 30-delta call. Waiting until 80 or 90 delta tested worse for us, because the buyback gets more expensive and the spreads get wider.

Here is a simplified example with round numbers: a stock trades at $100 and I sell the 30 delta $105 call for $2, bringing in $200. The stock jumps to $108, and the $105 call hits 70 delta. I buy it back for $4.50 and sell next month's 30 delta call, which is now around the $112 strike. If that new call pays about $2, the roll costs me a $2.50 debit, and that is a common outcome. It is still worth it, because I am buying back room for the stock to run: my sale price moves up from $105 to $112. When volatility is high, the new call can pay more than the buyback and the roll brings in a credit, which is the ideal roll. Real premiums depend on the stock, so check the numbers on the chain before you roll. The full step-by-step is in how to roll a covered call.

Before any roll, ask one question: do I still want to own this stock? If the answer is no, let the shares go at the strike and keep the premium. The rule keeps the process mechanical, so you are not making emotional decisions every time the stock moves.

Which Stocks Work Best for Covered Calls?

My favorite covered call stock is rarely the one with the highest premium. It is one I want to hold for years anyway: large, liquid, dividend-paying companies with tight bid-ask spreads and busy option chains, the kind of steady business that is not going to rip 20% higher. Broad market ETFs work well too, especially for smaller accounts.

A premium that looks too good is usually a warning. If a $55 stock pays $3 for a call way out at $70, the market is telling you that stock moves violently in both directions, and it is not one I want to hold for covered call income.

I learned the growth-stock lesson the expensive way. Years ago I owned Nvidia, it had a big run, and I thought it could not go much further. I sold covered calls on it and the stock went straight through my strike. I capped myself out of a lot of the upside that followed. Selling calls on a stock you believe could run hard, the Nvidias and Teslas of the world, is capping your best upside for a small premium. On a Coca-Cola or a Procter & Gamble, that same trade makes sense.

The Mechanics of Executing a Covered Call

Once the stock and the strike rule are settled, placing the trade is straightforward:

1. Check the calendar first: Confirm there are no earnings, major product events or ex-dividend surprises inside the expiration window. I never sell a call in front of earnings. If the news is good, the stock pops and you are capped; if it is bad, you were holding the stock anyway.
2. Pick the expiration: Look about 30 days out. Time decay is what pays you as the seller: the call you sold loses a little time value every day, and that decay speeds up as expiration gets closer. I do not go shorter than 30 days, though. Weekly options decay fastest, but they swing much harder when the stock moves toward your strike, and the call can rip higher in a hurry. Thirty days is the balance I stick with.
3. Pick the strike: Choose the call closest to 30 delta, and make sure you would be comfortable selling at that price.
4. Sell to open: Sell one call contract for every 100 shares you own (1 contract represents 100 shares), and the premium is credited to your account.
5. Set your alerts: Set an alert for 70 delta so you know when to roll, and note the next earnings and ex-dividend dates.

Key Considerations When Selling Covered Calls

Adjusting or Closing Covered Calls

You can close a covered call at any time by buying back the call you sold. If the stock has fallen, the call is usually cheaper than what you sold it for, so buying it back early locks in a profit and frees you to sell a new one. If the stock has risen sharply, buying back usually costs more than you collected, which is exactly the situation the 70 delta roll is designed to handle.

The other adjustment is to roll the call to a later expiration or a higher strike, which lets you keep the stock while continuing to collect premium. With selling options, a clear rule for when to adjust matters more than any single trade.

Conclusion

Selling a covered call is simple. Selling covered calls well comes down to a few rules applied every month: quality stocks you want to own, about 30 days out, the strike nearest 30 delta, no calls in front of earnings, and a roll when the call reaches 70 delta. Skip the deep in-the-money premiums that are mostly your own money coming back, and let the system do the work instead of your gut.

The Covered Call Series

Master the rest of the income toolkit:

📘 How to Sell a Put Option: Easy Steps to Get Started

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📘 The Collar: A Covered Call With a Protective Put

📘 How to Buy LEAP Options

📘 Understanding Option Greeks: Delta

📘 Covered Call Calculator: Know Your Return Before You Trade

📘 Covered Call vs Cash-Secured Put: Which Should You Sell?

📘 How to Roll a Covered Call (Step-by-Step Guide)

📘 Synthetic Covered Call: The Two Trades That Copy a Covered Call for Less

Covered calls are the first income strategy we teach inside the Options Trading in 21 Days course. Learn to sell a 30 delta covered call step by step, starting in a paper trading account.