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By Options AI Screener · Last updated 2026-10-12 · 7 min read
A covered call is the first options trade most stock investors make, and it is usually described as a way to earn income on shares you already hold. That description is accurate and incomplete. You are selling someone the right to take your shares at a fixed price, and the premium is what they pay for that right. Every strength and every weakness of the trade follows from the word right.
You own at least 100 shares of a stock. You sell one call contract against them, at a strike above the current price, with an expiry you choose.
The premium is credited immediately and is yours unconditionally. In return you have given up the shares above the strike for the life of the option.
That is the entire structure. Two positions, one obligation:
"Covered" refers to the fact that you can deliver the shares if asked. It is a statement about your ability to meet the obligation, not about your risk being covered, and the two get conflated constantly.
Illustrative numbers, chosen to be round.
You own 100 shares bought at $48. The stock now trades at $54. You sell a 30-day $58 call for $1.20, so $120 credited.
Set those last two beside each other, because together they are the trade:
| Outcome | Covered call | Shares alone |
|---|---|---|
| Stock at $70 | +$1,120 | +$2,200 |
| Stock at $44 | −$280 | −$400 |
The premium helped a little on the way down and cost a great deal on the way up. That is not a flaw in the example; it is the shape of every covered call.
The clearest way to think about it: you are converting an unknown upside into a known payment.
If you have no view on the stock, that exchange can be reasonable. If you own the stock because you expect it to appreciate substantially, you are selling the thing you bought it for. Those two cases call for different decisions, and the screener cannot tell you which one you are in.
It also means the trade's worst outcome is not the one people brace for. The loss that stings is not the stock falling — you had that risk anyway and the premium slightly reduced it. It is the stock running 25% while your shares leave at the strike, and then having to decide whether to buy them back higher.
Premium reduces your cost basis, and that is a legitimate way to keep score across repeated cycles. Sell a $1.20 call each month against a $48 basis and, if none is assigned, the basis falls by about a dollar a month.
Two cautions.
It is not downside protection. A $1.20 credit against a $54 stock is a 2.2% cushion. A stock that falls 30% has taken 2.2% of that off your loss and left the other 27.8%. Describing a covered call as conservative is reasonable only relative to holding the shares, which is the comparison people rarely make explicit.
Annualising is a comparison, not a forecast. A 2.2% monthly premium annualises near 30%, which assumes twelve uninterrupted cycles at the same premium with no assignment. Use the figure to compare a 30-day call with a 45-day call. Do not use it as an expected return.
Strike sets the trade-off directly: nearer the money pays more and is called away more often. Delta is the usual shorthand, and the 0.20 to 0.30 band is where most sellers sit — not because it is optimal, but because it balances premium against how often the shares leave.
Expiry is mostly a question of how much decision-making you want. Weekly calls collect more in total across a year and demand four times the attention, and each roll is a chance to make a worse choice under pressure.
Early assignment is uncommon, and when it happens it clusters in one place: an in-the-money call just before an ex-dividend date, where exercising early captures the dividend. If you are selling calls on a dividend payer, know where the ex-date sits relative to your expiry.
It fits on a share position you are content to sell at the strike, in a name you expect to drift rather than leap, when the option is liquid enough that buying it back does not cost you the credit in spread.
It does not fit when you would be unhappy to lose the shares, when a scheduled event sits inside the window — an earnings report can gap the stock straight through your strike — or when the share position is a long-term holding with embedded gains you do not want to realise. Assignment is a taxable sale, and that consequence is invisible on the option screen.
If you are willing to be assigned and then sell puts to buy the shares back, you are no longer running a covered call in isolation. You are running the wheel, which treats assignment at both ends as the mechanism rather than the risk.
The Covered Call screener shows the premium beside the strike, the days to expiry and the delta, so what you are giving up stays next to what you are paid. The companion piece on what probability of profit does and does not measure applies here too — a high chance of keeping the premium is not the same as a good trade, because on a covered call the cost of winning often lands above the strike.
None of this is advice about a specific position. The question the screener cannot answer is the one that decides it: at what price would you genuinely be happy to sell these shares.
It means you already own the 100 shares per contract that you may be required to deliver. The obligation is covered by the stock rather than by cash or margin. Selling the same call without owning the shares is a naked call, which has unlimited loss and is a completely different trade.
Your shares are called away at the strike price. You keep the premium and the gain up to the strike, and you lose any gain above it. If you want to keep the shares you must buy the call back before expiry, which will cost more than you sold it for.
Only by the amount of the premium. A dollar of credit on a fifty dollar stock moves your break-even from 50 to 49, which is a two percent cushion. The downside below that is the same as holding the shares outright, and calling a covered call a conservative strategy skips that fact.
The trade-off is fixed. A strike nearer the current price collects more and is called away more often. A nearer expiry collects less per contract but comes round more frequently, at the cost of more decisions and more commission. Delta is a reasonable shorthand for how likely assignment is.