Covered Call

What it is and when to use it

Selling a covered call turns a stock position into a position with a ceiling. You collect the premium on day one and keep it whatever happens; in exchange, if price finishes above the strike you are assigned and sell the shares there. It is not a riskless strategy: the downside risk is still the whole stock position, only cushioned by the premium collected.

The right moment is when you expect the underlying to rise a little, go sideways, or drift slightly lower. If you expect a strong rally, the covered call is the worst possible decision: you collect $698 to give up an advance that could be several thousand. And if you expect a sharp fall, $698 of premium protects very little — that is what a protective put or a collar is for.

The question worth asking before opening it is not "how much do I collect" but "am I happy to sell these shares at this price?". If the answer is yes, the covered call is a way of being paid for a sell limit order you were going to place anyway. If it is no, you are selling something you do not want to sell.

How it is built

Two legs, and you already have the first. Each options contract covers 100 shares, so the minimum position is 100 shares of the underlying.

• Hold 100 shares of the underlying for every contract you sell. That is the "covered" part of the name.
• Sell 1 out-of-the-money call, usually between 0.20 and 0.35 delta and 30 to 45 days to expiry.
• The strike you pick is your selling price. The closer to spot, the more premium and the higher the chance of assignment.

Without the 100 shares this is not a covered call but a naked call, with theoretically unlimited loss and completely different margin requirements. Same short leg, a risk that is nothing alike.

A full worked example

100 shares of SPY bought at 580.00 — $58,000 of notional — and a 595-strike call with 45 days to expiry. Model premium with the same inputs as the other pages: 4.2% risk-free rate, 1.2% dividend yield, 15% base implied volatility.

Premium collected $698 = 1.20% of notional in 45 days, 9.8% annualised if repeated.

That "annualised" figure needs care: it assumes you can repeat the trade eight times a year at the same premium and never be assigned, and none of the three is guaranteed. It is useful for comparing two strikes against each other, not as an expectation of return.

Maximum profit, maximum loss and break-evens

The premium lowers the break-even by 1.20%: below 573.02 the position loses money exactly as the shares alone would, only $698 later.

• Maximum profit = (strike − purchase price + premium) × 100 = (595 − 580 + 6.98) × 100 = $2,198. Reached with price at 595 or above at expiry.
• Maximum loss = (purchase price − premium) × 100 = $57,302, if the underlying went to zero. It is the stock risk, reduced by the premium.
• Break-even = purchase price − premium = 580 − 6.98 = 573.02.
• Effective selling ceiling = strike + premium = 601.98.

The opportunity cost appears in no formula and is the number that stings most. If SPY runs to 620, the shares alone would have made $4,000 and the covered call makes $2,198: the $698 premium cost $1,802 of forgone upside.

The position Greeks

The short call subtracts delta from the shares and adds positive theta and negative vega. Figures per contract, already multiplied by 100:

The net delta of 65.1 is the practical figure: the position behaves as if you owned 65 shares, not 100. If the reason you hold SPY is market exposure, systematically selling covered calls leaves you with a third less exposure than you think you have.

Management: when to close, when to roll

The key decision arrives when price approaches the strike, and it needs to be made before that happens.

If you want to keep the shares

Roll the call up and out before it goes in the money: buy back the 595 and sell a higher strike in a later expiry. It usually goes through for a small credit or at zero cost, and raises the ceiling in exchange for extending the commitment.

If you are happy selling at that price

Let it be assigned. That is the planned outcome, not a failure: you have sold at 595 shares you bought at 580, and kept the premium as well.

Cheap buy-back

If the call falls to 20% of what you sold it for — here, 1.40 — closing it releases the ceiling for very little money and lets you sell another with more premium. The last 20% of the credit is the slowest to arrive.

Mind the dividend

An in-the-money American call can be exercised early the day before the ex-dividend date, when the dividend exceeds its remaining time value. If collecting that dividend was the point, that is the night you lose it.

Common mistakes

Selling them on shares you do not want to sell

The premium is payment for an obligation to sell. If the position is long-term and conviction is high, collecting $698 to cap it at 595 is selling cheap the very scenario that justified holding the shares.

Picking the strike by the fattest premium

Near strikes pay more because assignment is far likelier. Selling the 585 call instead of the 595 collects more premium and all but guarantees you sell the shares within six weeks.

Rolling down to collect more after a fall

Lowering the strike after price has dropped raises the premium and also the chance of selling the shares at the worst moment, exactly when they are cheapest. It is being paid to sell the low.

Confusing the annualised figure with a return

A 9.8% annualised figure assumes eight repetitions at the same premium with no assignment. In practice, the times the market rallies hard you get assigned and stop collecting — which is precisely when the calculation assumed you would continue.