Selling a covered call sounds simple: you own shares, you sell someone the right to buy them at a set price, and you keep the premium. The confusion starts when you try to answer a basic question — what did I actually earn? There are several different answers depending on which number you look at, and brokers tend to display whichever one looks best. This article walks through one complete example, with every number shown, so you can check any covered call quote yourself in about a minute.
The setup: five numbers you need
A covered call calculation uses five inputs:
- Share price — what the stock trades at now, and what your shares are worth.
- Strike price — the price at which the buyer can take your shares away.
- Premium — what you are paid per share for selling the call.
- Contracts — each contract covers 100 shares.
- Days to expiration — how long your shares are committed to this trade.
Here is the worked example used throughout this article. It is hypothetical and uses round numbers on purpose:
- Stock price: $100 (you own 100 shares — a $10,000 position)
- Call strike: $105
- Premium: $2.00 per share
- Contracts: 1
- Time to expiration: 30 days
Step 1: The premium
The premium is the one number that never changes after the trade opens:
$2.00 × 100 shares = $200, credited to your account when you sell the call.
Whatever happens next, that $200 is yours. Every other figure in this article is measured against it.
Step 2: Your breakeven
Breakeven = share price − premium per share = $100 − $2.00 = $98.00.
If the stock ends the period above $98, the overall position made money. Below $98, the premium cushions the loss but does not prevent it. If the stock falls to $80, the shares lose $2,000 and the premium offsets only $200 of it — a net loss of $1,800. A covered call is not a hedge. It is a small discount on a loss you still fully own.
Step 3: If the call expires worthless
If the stock stays at or below $105 through expiration, the call expires, you keep the shares, and you keep the $200. This is the outcome most sellers are quietly hoping for: the income arrives, nothing is sold, and the same shares are free to be written against again next month.
Return on the capital committed = premium ÷ share value = $200 ÷ $10,000 = 2.0% in 30 days.
To compare trades of different lengths, sellers annualize that pace: 2.0% × (365 ÷ 30) ≈ 24.3%. Treat this number with suspicion. It assumes you could repeat the identical trade twelve times a year at the same premium, which markets rarely allow. It is a pace, not a forecast, and it is definitely not a promise.
Step 4: If your shares are called away
If the stock rises above $105, your shares are sold at $105 whether you like it or not.
- Gain on the shares: ($105 − $100) × 100 = $500
- Plus the premium: $200
- Total profit: $700 — a 7.0% return on the $10,000 position
That $700 is the maximum profit, and it does not grow if the stock keeps climbing. If the stock runs to $120, a shareholder who did nothing makes $2,000. The covered call seller still makes $700 and has handed over $1,500 of upside. That trade-off — certain small income now, capped gains later — is the entire deal. Make sure you are signing it on purpose.
Run your own numbers: the free Options Premium Calculator takes your stock price, strike, and premium and returns the premium income, breakeven, return on collateral, and if-called profit — the same four numbers computed above.
The example at a glance
| Scenario (stock at expiration) | The math | Your result |
|---|---|---|
| Call expires worthless ($105 or below) | $200 ÷ $10,000 | +2.0% (24.3% annualized pace) |
| Shares called away (above $105) | $500 share gain + $200 premium | +$700 (7.0%) |
| Stock falls to $80 | −$2,000 share loss + $200 premium | −$1,800 |
What the calculator cannot tell you
Three things sit outside this arithmetic. First, dividends: if the stock pays one while the shares are still yours, you collect it — a small bonus the table ignores. Second, early assignment: shares can be called away before expiration, most often right before a dividend date. Third, taxes and fees: premiums and share gains are taxable, and assignment fees vary by broker. None of this changes the method, but all of it changes what finally lands in your account.
That method is the real point. If you can state all four numbers — premium, breakeven, return on collateral, and the if-called cap — before placing a covered call, you understand the trade you are making. If you can only state the premium, you are looking at the one number designed to be attractive.
Before your next trade: plug a real quote into the Options Premium Calculator and compare the four numbers side by side. It takes less time than reading this article did.
Disclaimer: This article is general education only and is not financial advice. Options involve substantial risk, including the possible loss of the full value of the shares or cash committed to a trade. The example above is hypothetical, uses round numbers, and does not represent any actual trade or result. Consult a licensed financial adviser about your own situation before trading.
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