How Covered Calls Work

A covered call requires exactly two things: 100 shares of a stock you own, and a willingness to sell those shares at a specific price. That’s it. No margin, no special accounts, no extra cash. If you own 100 shares, you can sell a covered call against them today.

One important note: options contracts come in units of 100 shares. If you own 300 shares, you can sell up to three contracts. You can’t sell a covered call on 73 shares — it’s 100 or nothing per contract.

The Mechanics: A Concrete Example

Let’s use Procter & Gamble (PG) to walk through this.

Your situation: You own 100 shares of PG, currently trading at $170. You’re not in a rush to sell, but you’d be fine selling at $180 if it gets there in the next month.

The trade: You sell one PG $180 call expiring in 35 days for a premium of $2.00 per share.

What just happened: Someone paid you $200 ($2.00 × 100 shares) for the right to buy your shares at $180. That $200 lands in your account immediately — yours, no matter what happens next.

In exchange, you’ve taken on an obligation: if the buyer exercises, you must sell your 100 shares at $180.

Now one of three things happens at expiration.

The Three Scenarios

graph TD
    A["You own 100 shares\nSell a covered call"] --> B{"At expiration?"}
    B -->|"Stock below strike"| C["Option expires worthless\nKeep shares + premium"]
    B -->|"Stock above strike"| D["Shares called away\nSell at strike + keep premium"]
    B -->|"Stock drops"| E["Option expires worthless\nKeep shares + premium\n(cushions the loss)"]
    style C fill:#22c55e,color:#fff
    style D fill:#3b82f6,color:#fff
    style E fill:#eab308,color:#fff

Scenario 1: Stock Stays Below $180 (Expires Worthless)

Expiration arrives and PG is at $174. The option buyer can buy PG at $180 — but why would they? They can buy it on the market for $174. The option expires worthless.

Your result: You still own your shares. You kept the $200 premium. You also gained $400 in stock appreciation ($170 → $174). Total benefit: $600.

And you can do it again next month. This repeating cycle is how covered call sellers generate consistent income.

Scenario 2: Stock Rises Above $180 (Assignment)

PG has a great month — earnings beat, analyst upgrade — and trades at $190 at expiration. The buyer exercises their right to buy at $180. This is assignment.

Your brokerage automatically sells your 100 shares at $180. $18,000 appears in your account. Your PG position is gone.

Your result:

Stock appreciation: $1,000 ($170 → $180)
Premium collected: $200
Total profit: $1,200

“But the stock went to $190 — I left $1,000 on the table.”

True. But you made a 7% return on a $17,000 position in 35 days — on Procter & Gamble. You picked $180 because you were happy to sell there. And you did sell there. That’s a win.

Scenario 3: Stock Drops (Cushioned Loss)

PG falls to $160. The call expires worthless (nobody exercises the right to buy at $180 when the stock is at $160). You keep the $200 premium.

Your result:

Stock decline: -$1,000
Premium collected: +$200
Net loss: -$800

Without the covered call, you’d be down $1,000. The premium didn’t prevent the loss, but it softened it — effectively lowering your cost basis from $170 to $168. You still own the shares and can sell another call next month.

The Math That Matters

Using the PG example:

Stock price: $170 | Strike: $180 | Premium: $2.00 ($200/contract) | Days: 35

Metric	Calculation	Result
Premium yield	$200 / $17,000	1.18% in 35 days
Annualized premium yield	1.18% × (365/35)	~12.3% per year
Max return if assigned	($1,000 + $200) / $17,000	7.06% in 35 days

Real-world returns won’t be this clean every month — some months you get assigned and need to redeploy, some months the stock drops. But even at half the annualized rate, 5–7% in premium income on top of normal stock performance is meaningful. See Income Targets for how to think about realistic return expectations.

What Happens on Your Screen

When you sell a covered call in your brokerage:

Navigate to the options chain for the stock you own — a table of strike prices and expiration dates.
Select an expiration date. You’ll see options organized by date — weekly, monthly, etc.
Choose a strike price. Each strike shows a bid and ask price (just like stocks). Choosing the right one involves tradeoffs covered in Choosing Strikes and Expirations.
Select “Sell to Open.” This opens a new short options position.
Review and confirm. Your broker shows the details — stock, strike, expiration, premium, and that this is a covered call.

The order typically fills within seconds for liquid stocks. Your broker will also lock the underlying 100 shares, so you can’t sell them separately while the call is open.

A Few Things to Keep in Mind

You can close or adjust at any time. Before expiration, you can “buy to close” the call to release your shares. This is how you exit early or roll the position to a new strike or expiration.

Dividends still matter. You collect dividends as long as you own the shares. The only wrinkle: if your call is deep in the money right before the ex-dividend date, the buyer might exercise early to capture the dividend. This is rare with out-of-the-money calls.

Liquidity matters. Stick with stocks and ETFs that have active options markets. Tight bid-ask spreads mean you’re not giving up money just to enter and exit. Major stocks and popular ETFs are fine; small-caps often aren’t.

Taxes are a thing. Premium income is generally taxed as short-term capital gains. If you’re in a tax-advantaged account (IRA, Roth IRA), this doesn’t matter. If you’re in a taxable account, factor it in.

Watch out for common errors. New covered call sellers consistently make a handful of the same mistakes — see Common Mistakes before your first trade.