Covered Call
A covered call is an options strategy in which an investor who holds a long position in an underlying asset simultaneously sells (writes) a call option on that same asset, collecting premium income in exchange for capping the upside beyond the option's strike price.
Key takeaways
- The position is 'covered' because the investor owns the underlying shares; if the call is exercised, the investor delivers the existing shares rather than purchasing them in the open market at a potentially higher price.
- Maximum profit = (Strike Price - Purchase Price of Stock) + Premium Received; achieved when the stock price equals or exceeds the strike at expiration.
- Maximum loss = Purchase Price - Premium Received; theoretically down to zero, making covered calls a strategy that enhances income but provides only limited downside protection.
- Covered calls are used to generate income on holdings in range-bound markets, monetize near-term neutral views, or achieve an effective exit at a premium to the current market price.
- The strategy implicitly sells convexity: the call premium received compensates for giving up unlimited upside, effectively creating a payoff equivalent to a short put at the same strike (put-call parity).
Explanation
A covered call combines a long stock (or long futures) position with a short call option on the same underlying in a 1:1 ratio. The call is 'covered' because the writer holds the underlying asset that would need to be delivered if assignment occurs. This distinguishes it from a naked (uncovered) call, where the writer would need to buy the underlying in the open market at prevailing prices upon assignment — a position with theoretically unlimited loss exposure.
The payoff at expiration is: if ST ≤ K (strike), the call expires worthless, the investor keeps the premium c, and holds the stock worth ST. If ST > K, the call is exercised, the investor delivers the stock and receives K. In both cases, the premium c is retained. The total profit at expiration relative to just holding the stock is: P = min(ST, K) + c - S0, where S0 is the purchase price of the stock. The breakeven is S0 - c — the stock must fall below this level for the covered call to lose money relative to a flat position.
Covered calls are most attractive when implied volatility is elevated (the premium received is high) and the investor has a neutral to mildly bullish near-term view. The strategy generates income that reduces the effective cost basis of the stock position over time. Institutional investors — particularly pension funds and insurance companies holding large equity portfolios — systematically write covered calls through 'buy-write' or 'covered call overlay' programs to enhance yield and reduce portfolio cost basis.
By put-call parity, a covered call position is economically equivalent to a cash-secured short put: Long Stock + Short Call = Short Put (synthetically). Both positions profit from time decay, benefit from lower-than-implied realized volatility, and lose if the stock falls sharply. This equivalence is important for pricing, margining, and risk management purposes. Delta of a covered call position ranges from 0 (deep in-the-money call, nearly equivalent to holding no delta) to 1 (deep out-of-the-money call, nearly equivalent to holding the stock outright). Gamma is always negative for the covered call writer, meaning the position loses convexity as the stock moves toward the strike.
Formula
Covered Call Profit = min(ST, K) + c - S0; Max Profit = K - S0 + c; Breakeven = S0 - c
Example
An investor purchased 500 shares of Microsoft (MSFT) at $380 per share ($190,000 total). With the stock trading at $420, they believe near-term upside is limited and write 5 covered call contracts (each covering 100 shares) with a strike of $440 expiring in 45 days for $6.50 per share, collecting $3,250 in premium (= 5 × 100 × $6.50). If MSFT trades below $440 at expiration, the calls expire worthless and the investor keeps the $3,250 premium — a 1.71% return on cost over 45 days (roughly 13.9% annualized), reducing the effective cost basis to $373.50. If MSFT rises above $440, the shares are called away and the investor receives $440 + $6.50 = $446.50 effective exit price, a 17.5% gain from the original $380 purchase — a satisfactory outcome despite missing any further upside.
Related terms
Basis Binomial Tree Model Call Option Convexity Delta Diagonal Spread Dominant Future Equity Exchange Gamma Hybrid Security Implied Volatility