What a covered call actually is
A covered call has two parts. You own at least 100 shares of a stock, and you sell one call option against those shares. Selling the call means someone pays you a premium up front for the right to buy your shares at a set price, called the strike, before the option expires. The trade is “covered” because you already own the shares you might have to deliver, so there is no open-ended risk on the option itself.
The premium is yours to keep the moment you sell the call, no matter what the stock does afterward. What you give up in return is your upside above the strike. Past that price, the gains belong to the buyer, not you.
Why traders use it
The point of a covered call is to generate income on shares you already hold. If you own a stock you are content to keep, selling calls against it turns a quiet position into one that pays you a premium every cycle. That premium also lowers your effective cost basis: collect $1.50 on a stock you bought at $48 and your real breakeven drops to $46.50.
It fits best when you are neutral to mildly bullish. You think the stock drifts up, trades flat, or rises modestly, but you do not expect a moonshot. If you were certain it would rocket, capping your upside would be the wrong trade. The covered call is a way to get paid for the sideways-to-slightly-up scenario that stocks spend most of their time in.
The max profit and breakeven formulas
- Max profit = (strike price − cost basis + premium) × 100. Realized if the stock is at or above the strike at expiration and the shares are called away.
- Breakeven = cost basis − premium collected. The premium cushions the downside by exactly that amount.
Both formulas lean on the same fact: one contract covers 100 shares, so every per-share number gets multiplied by 100 to reach dollars. Your max profit is fixed the moment you sell the call, because it is capped at the strike. The premium does two jobs at once, it adds to your gain on the upside and it lowers your breakeven on the downside.
A worked example
You own 100 shares bought at $48. You sell the $52 call for $1.50, which pays you $150 up front since one contract is 100 shares. If the stock finishes above $52 at expiration, your max profit is (52 − 48 + 1.50) × 100 = $550, and your shares are called away at $52. Your breakeven is $48 − $1.50 = $46.50, so the stock can slip to $46.50 before you are underwater. If it just sits between $46.50 and $52, you keep the $150 premium and still own the shares, free to sell another call next cycle.
The two downsides
First, your upside is capped. If the stock rockets past the strike, your gain stops at $52 no matter how high it goes. You still made your $550, but you miss the entire run above the strike, and watching a called-away stock keep climbing is the classic covered-call regret. That is the price of the premium, and it is a real cost, not a technicality.
Second, you still own the stock, so a large drop still hurts. The premium softens the fall by exactly what you collected and no more. Own the shares at $48, collect $1.50, and a slide to $40 still costs you $6.50 per share after the cushion. A covered call does not protect a position, it only trims the top and pads the bottom by a little. If you would not hold the shares outright, selling calls against them is not a fix.
What happens at assignment
If the stock is above the strike at expiration, the call is in the money and the shares are called away: you sell them at the strike price, $52 in the example, and the position closes. If the stock is at or below the strike, the call expires worthless, you keep your shares, and you are free to sell another call. Either way, the premium you collected up front is yours to keep. Assignment is not a penalty, it is simply the trade doing what you agreed to when you sold the call.
The cash-secured put mirror
A cash-secured put is the covered call flipped around. Instead of selling a call against shares you own, you sell a put and hold enough cash to buy the stock at the strike if you are assigned. You collect the premium the same way, and you take on the obligation to buy at the strike rather than to sell at it. Traders use it to get paid while waiting to buy a stock at a price they like: if it never dips to the strike, you keep the premium; if it does, you buy the shares you wanted anyway, at a net cost lowered by the premium.