What is a Synthetic Short Call? Definition, Construction, and Example
A synthetic short call is an options position that replicates the payoff of a short call by combining a short stock position with a short put option at the same strike price and expiration date.
What is a synthetic short call?
A synthetic short call is an options strategy that replicates the payoff of a short call option without selling a call. The construction is a short stock position plus a short put option at the same strike price and expiration date. This combination produces the same risk and reward profile as a short call: limited profit if the stock stays below the strike, unlimited loss if the stock rises. The strategy is a direct application of put-call parity, which states that a short stock plus a short put equals a short call plus cash.
How is a synthetic short call constructed?
The formula for the synthetic short call is:
Synthetic Short Call = Short Stock + Short Put
At expiration, if the stock price (S) is below the strike price (K), the put is exercised, and the trader buys the stock at K, profiting from the difference between the short sale price and K, minus the put premium received. If the stock price is above the strike, the put expires worthless, and the trader's loss is unlimited as the stock rises. This is the same payoff as a short call.
The trader receives a credit when establishing the position: the short stock proceeds plus the put premium. The breakeven price at expiration is the short sale price minus the put premium received. The maximum profit occurs if the stock falls to zero: the trader keeps the short sale proceeds and the put premium, and the put is exercised at K, but the trader buys the stock at K, which is above zero, so the maximum profit is capped. The maximum loss is unlimited.
The trader can also construct a synthetic short call using options only: a short call plus a long put at the same strike and expiration replicates a short stock position, and adding a short put creates the synthetic short call.
Worked example
On August 15, 2026, TSLA trades at $250.00. A trader believes TSLA will fall and wants to replicate a short call with a $250 strike and September expiration. The $250 put with September expiration trades at $8.00. The trader shorts 100 shares of TSLA at $250.00 (receiving $25,000) and sells one $250 put at $8.00 (receiving $800). The total credit is $25,800.
At expiration, if TSLA trades at $220, the put is exercised, and the trader buys the stock at $250. The trader's profit is the credit of $25,800 minus the cost of buying the stock at $250 ($25,000), plus the difference between the short sale price and the exercise price: $25,800 - $25,000 = $800. The maximum profit is $800, which occurs if TSLA stays at or above $250. If TSLA trades at $300, the put expires worthless, but the trader must buy back the short stock at $300, losing $50 per share, or $5,000, minus the $800 put premium, for a net loss of $4,200. The loss is unlimited as the stock rises.
When traders use synthetic short calls
Traders use synthetic short calls when they want the payoff of a short call but prefer the margin treatment of a short stock position, or when the put is overpriced relative to the call. The strategy is also used to monetize a bearish view on a stock that is difficult to borrow — the trader can sell a put instead of shorting stock, but the synthetic short call requires the short stock position. The strategy is also used in pairs trading: a trader shorts stock and sells a put on a second stock to create a synthetic short call on the second stock while maintaining a directional hedge.
Limitations and common misconceptions
The synthetic short call carries unlimited upside risk, identical to a short call. The strategy requires a margin account with sufficient equity to support both the short stock and the short put. The short stock position is subject to a stock borrow fee, which is not present in a short call. A common misconception is that the synthetic short call has limited risk because the short put has a defined maximum loss. That is false — the short stock component has unlimited loss potential. The strategy also introduces assignment risk on the short put: if the put is exercised early, the trader is forced to buy the stock at the strike price, which may be above the market price.