What Is a Synthetic Covered Call?
A synthetic covered call is a position that replicates the risk-reward profile of a traditional covered call but uses options instead of stock ownership. Through put-call parity, selling a cash-secured put at a given strike produces the exact same payoff as owning the stock and selling a covered call at that same strike. This equivalence is one of the most important concepts in options theory and has practical implications for capital efficiency.
The primary advantage of a synthetic covered call (short put) over a traditional covered call is capital efficiency. A cash-secured put requires you to set aside cash equal to the strike price times 100, while a traditional covered call requires purchasing the shares. In a margin account, the cash-secured put may require significantly less capital.
Put-Call Parity: The Mathematical Proof
- 1Traditional CC: Buy stock at $100, sell $100 call for $3.50
- 2 Capital needed: $10,000 - $350 = $9,650
- 3 Max profit: $350 (3.62% return)
- 4 Breakeven: $96.50
- 5Synthetic CC: Sell $100 put for $3.00
- 6 Capital needed: $10,000 cash secured (or less on margin)
- 7 Max profit: $300 (3.00% return)
- 8 Breakeven: $97.00
- 9The traditional CC earns slightly more due to interest rate effects in put-call parity
Comparison Table
| Feature | Traditional CC | Synthetic (Short Put) |
|---|---|---|
| Position | Long Stock + Short Call | Short Put only |
| Capital (cash account) | Full stock price | Full strike price x 100 |
| Capital (margin) | 50% of stock | ~20% of strike value |
| Premium Income | Call premium | Put premium (slightly less) |
| Dividend Eligibility | Yes (you own shares) | No |
| Assignment Result | Deliver shares at strike | Receive shares at strike |
| Complexity | Two legs | One leg |
Use a synthetic covered call (short put) when you want capital efficiency, do not need dividend income, and want a simpler one-leg position. Use a traditional covered call when you already own the shares, want dividends, or need the stock position for other reasons.