What are you really doing when you write a call against stock you own?
The covered call is the most widely described options structure in existence, usually under the heading "conservative income." Its risk profile is not what that heading suggests, and seeing why takes everything this course has built.
What follows is a worked example of what a share position plus a written call does to your payoff, and it is not a suggestion to use one.
The setup
You own 100 shares bought at $100 ($10,000). You write one three-month $110 call and collect $3.00 ($300). The shares "cover" the obligation — if assigned, you deliver stock you already hold rather than buying it at any price, which removes the unlimited-loss problem of a naked call.
The three outcomes, in numbers
Stock at $110 or above at expiry — assigned. You sell at $110. Gain = $10 on the shares + $3 premium = $13 per share = $1,300. That is the maximum, whether the stock finishes at $111 or at $300.
Stock between $100 and $110 — not assigned. You keep the shares and the $300, so the gain runs from $3 a share at $100 up to $12.99 just below $110 — always a shade under the $13 cap, never above it.
Stock below $100 — not assigned, and the decline is yours. At $70 you are down $30 per share, cushioned by the premium to −$27 per share = −$2,700.
Your effective breakeven on the shares falls from $100 to $97 — a 3% cushion on a position that can, in principle, fall 100%.
The three costs people underrate
1. You sold the tail. If the stock reaches $150, you still sell at $110. That is $40 per share = $4,000 of forgone gain, against the $300 you collected. Equity returns are historically driven by a small number of very large moves; a covered call systematically hands those away in exchange for many small payments.
2. The downside is barely touched. $3 of premium against a position that can lose $100 is not a hedge. It is a rounding adjustment to your cost basis. A covered call is a long stock position with essentially all of its downside intact.
3. The payoff shape is a short put. Capped gain above, a decline that runs all the way to zero below — this is exactly the shape of writing a put, the position Unit 1 priced at −$9,300 if the shares went to nothing. The two positions differ in collateral and bookkeeping, not in risk shape. "Conservative income" describes the feeling of collecting the premium, not the profile of the position.
And the operational friction
Assignment can arrive early, particularly around an ex-dividend date, taking your shares before you expected. Assignment also forces a disposal you did not schedule, which can carry tax consequences in many jurisdictions. Repeating the structure means repeating both.
The honest summary
A covered call converts an uncertain, open-ended upside into a certain, small, immediate payment, and leaves the downside almost entirely in place. Whether that exchange is sensible depends on circumstances this course cannot see and does not ask about. We are showing you the arithmetic so that you can recognise the trade being described the next time somebody calls it safe.
Try it now
- Pick a call expiring in roughly three months, a strike or two above the current price, from Apple's chain in the EODHD Terminal. Note the premium as the midpoint of Bid and Ask, and today's share price, below.
Open AAPL.US — options in the EODHD Terminal
- Compute three numbers: the maximum gain if assigned, the effective breakeven on the shares, and the forgone gain if the stock rose 40% by expiry.
- Put the first number beside the third and look at them together. Then check the stock's own history, drawn below, for how often it rose more than the strike distance inside a three-month window; Measure a few of the sharper three-month runs to see. That frequency is the real cost of the cap.
A note on what we do here. This is an illustration of mechanics, presented with its downsides stated. It is not a recommendation, and the fact that a structure is common does not make it low-risk. A covered call caps your gains and leaves nearly all of your loss exposure in place.