A synthetic short put is created when long stock position is combined with a short call of the same series. It is so named because the established position has the same profit potential a short put.

Position construction

Long 100 Underlying, Sell 1 ATM Call

The covered call is a popular example of a synthetic short put.

Limited Profit Potential

Maximum profit

Premium Received - Commissions Paid

Profit achieved when: Price of Underlying >= Strike Price of Short Call

Synthetic Short Put payoff at expiration
Payoff at expiration

Unlimited Risk

Maximum loss

Unlimited

Loss occurs when: Price of Underlying < Purchase Price of Underlying - Net Premium Received

Loss = Purchase Price of Underlying - Price of Underlying - Premium Received + Commissions Paid

Breakeven point

Breakeven

Purchase Price of Underlying - Premium Received