A short put is one of the most popular income strategies in options trading. You sell a put option, collect the premium upfront, and take on the obligation to buy the underlying stock at the strike price if the option is exercised. When the stock stays above your strike at expiration, the option expires worthless and you keep the full premium.

Before placing a short put trade, use the free short put calculator to model your exact max profit, max loss, and breakeven for any set of strikes and premiums.

What Is a Short Put Options Strategy?

A short put involves selling one put option contract on a stock or ETF you are willing to own. The seller collects a cash premium at entry. In exchange, the seller accepts the obligation to purchase 100 shares at the strike price if the buyer exercises the option before or at expiration.

Traders use the short put strategy for two primary reasons: to generate income on a stock they are neutral to bullish on, or to acquire shares at a discount to the current market price. The strategy profits most when the stock price stays flat or rises. The main risk is a sharp drop in the underlying stock.

Short Put Payoff: Max Profit, Max Loss, and Breakeven

The short put has a defined maximum profit and an asymmetric risk profile on the downside.

• Max profit: The premium received when the put is sold. This is the most you can earn on the trade. You reach full profit if the stock closes at or above the strike price at expiration.
• Max loss: Strike price minus the premium received, multiplied by 100. This represents the worst-case scenario where the stock drops to zero. For a $50 strike put sold for $2.00, max loss per contract is ($50 – $2.00) x 100 = $4,800.
• Breakeven: Strike price minus the premium received. Using the same example, breakeven is $50 – $2.00 = $48.00. The trade remains profitable as long as the stock stays above $48.00 at expiration.

These three values depend entirely on your strike and premium. The short put calculator computes all three instantly once you enter your inputs.

Step-by-Step Example of a Short Put Trade

Suppose XYZ stock is trading at $55 per share. You are neutral to bullish on XYZ and willing to buy shares at $50 if the stock declines. You sell one $50 strike put expiring in 30 days for a $2.50 premium, collecting $250 (100 shares x $2.50).

• Scenario 1 (stock at $55 at expiration): The put expires worthless. You keep the full $250 premium. Profit: $250.
• Scenario 2 (stock at $49 at expiration): The option is exercised. You buy 100 shares at $50 with an effective cost basis of $47.50 ($50 minus $2.50 premium). Loss relative to breakeven: $50 per share.
• Scenario 3 (stock at $30 at expiration): Assigned at $50. With a $2.50 premium collected, your effective purchase price is $47.50. Unrealized loss per share: $17.50, or $1,750 on the position.

Notice that assignment in Scenario 2 is not necessarily a bad outcome if you wanted to own XYZ at $47.50. Many traders use the short put specifically to set a target entry price while earning premium while they wait.

When to Use a Short Put Strategy

A short put works well when several conditions are present at the same time. First, you need a neutral to bullish view on the underlying stock. If you expect the stock to fall, a short put is the wrong tool because losses increase as the stock drops. Second, you should be comfortable owning shares at the strike price. Assignment is always possible, and the strategy should be sized so that buying 100 shares at the strike does not create a position you cannot manage. Third, implied volatility (IV) should be elevated, because higher IV means higher premiums for the same strike and expiration.

If you want to limit the downside of a short put, consider using a bull put spread calculator to model a credit spread that caps your maximum loss in exchange for lower premium income.

Short Put vs. Cash-Secured Put

You will often see the terms “short put” and “cash-secured put” used interchangeably. They describe the same options position. The difference is capital management. A cash-secured put requires you to hold enough cash in your account to cover the full cost of the assignment (strike price x 100 shares). A naked or uncovered short put does not require that cash reserve and therefore carries more risk if the stock falls sharply.

Most retail brokers automatically treat short puts in cash accounts as cash-secured. Use the cash-secured put calculator if you want to see return on capital alongside the standard payoff metrics.

After assignment, many traders sell covered calls on the shares they acquired. The covered call calculator can help you model the next trade in that two-step income sequence.

Comparing a Short Put to a Long Put

A long put calculator can help you model the opposite position. When you buy a put, you pay a premium and gain the right to sell shares at the strike price. Long puts profit when the stock drops. Short puts profit when the stock stays flat or rises. The two strategies have mirror-image payoff profiles: the long put buyer’s gain is the short put seller’s loss, and vice versa.

Frequently Asked Questions

What is the maximum loss on a short put?

The maximum loss on a short put equals the strike price minus the premium received, multiplied by 100. This worst-case scenario occurs if the underlying stock drops to zero.

Do I need margin to sell a put?

A cash-secured short put requires enough cash to cover a potential assignment (strike x 100). A naked short put requires a margin account and approval for uncovered options trading at your broker.

When should I close a short put early?

Many traders close short puts at 50% of max profit rather than holding to expiration. This locks in most of the available gain while freeing capital and reducing the risk of a late reversal in the stock.

What happens if a short put is assigned?

If your short put is assigned, you are required to buy 100 shares of the underlying at the strike price. Your effective cost basis is the strike price minus the premium you collected. You now own the shares and can hold them, sell them, or sell a covered call to generate additional income.

Is a short put bullish or bearish?

A short put is a neutral to bullish strategy. It profits when the underlying stock stays flat or rises above the strike price at expiration. It loses money when the stock falls below the breakeven level (strike minus premium).