# Short Put

> A short put sells a put option to collect premium, profiting if the price stays above the strike. Learn the payoff, risks, margin and how it can buy stock.

Source: https://learn.tradelabsai.com/options/short-put/  
Track: Options · Level: Intermediate · Updated: 2026-10-03  
Publisher: TradeLabs AI (https://tradelabsai.com). Education, not financial advice.  
Cite as: TradeLabs Learn, "Short Put", https://learn.tradelabsai.com/options/short-put/

A short put means selling a put option. The seller collects a premium and agrees to buy the underlying at the strike price if assigned. If the underlying stays above the strike through expiration, the put expires worthless and the seller keeps the premium. If it falls below, the seller must buy shares at the strike, which may be well above the market price. Short puts are bullish to neutral and are used both to earn income and as a way to buy stocks at a lower effective price.

## Payoff at a glance

| Feature | Short put |
|---|---|
| Outlook | Neutral to bullish |
| Maximum gain | Premium received |
| Maximum loss | Strike minus premium (if the underlying falls to zero) |
| Break even at expiry | Strike minus premium |
| Time decay | Helps |
| Rising implied volatility | Hurts |

*Figure: Short put at expiration.*

## Worked example

**Example: Selling a put on a stock you like**
A stock trades at $60. You sell one $55 put expiring in 35 days for $1.50, receiving $150.

- **Stock at $58 at expiry:** put expires worthless. You keep $150.
- **Stock at $53.50:** you are assigned and buy 100 shares at $55. Net cost $55 minus $1.50 = $53.50 per share. Break even.
- **Stock at $45:** you buy shares at $55 that are worth $45. Loss: ($10 minus $1.50) × 100 = $850.
- **Stock at $0 (bankruptcy):** loss: $5,350.

## Short put vs owning the stock

A short put has a similar risk profile to owning shares below the strike, but with a capped upside.

| | Short $55 put for $1.50 | Buying stock at $60 |
|---|---|---|
| Stock rises to $70 | Gain $150 | Gain $1,000 |
| Stock flat at $60 | Gain $150 | $0 |
| Stock falls to $55 | Gain $150 | Loss $500 |
| Stock falls to $45 | Loss $850 | Loss $1,500 |

The short put wins in flat and mildly falling markets and loses less in a crash, but misses big rallies. See [Put-Call Parity](https://learn.tradelabsai.com/options/put-call-parity/) for why a short put resembles a covered call.

## Cash secured vs naked puts

- **Cash secured put:** the seller holds enough cash to buy the shares if assigned. This is a conservative way to sell puts and is allowed in many accounts. See [Cash-Secured Put](https://learn.tradelabsai.com/options/cash-secured-put/).
- **Naked put (on margin):** the seller posts only margin. This allows larger positions but adds leverage and margin call risk. See [Margin](https://learn.tradelabsai.com/markets/margin/).

## The risk of selling puts

Short puts win often and lose rarely, but the rare losses can be large. Selling puts is similar to selling insurance: steady premiums, with occasional big payouts during crashes. In sharp market declines, many put sellers suffer losses at the same time, and implied volatility spikes, which makes positions look worse before expiration. See [Theta Harvesting](https://learn.tradelabsai.com/options/theta-harvesting/) and [Fat Tails](https://learn.tradelabsai.com/math/fat-tails/).

**Watch out: Size for the crash, not the average**
Size short puts as if you might be assigned on all of them in a market fall. If being assigned on every position would put your account in trouble, the positions are too large.

## Managing a short put

- **Buy back early** after capturing much of the premium.
- **Roll down and out** to a lower strike and later expiry if challenged, accepting that this extends the trade.
- **Accept assignment** if you are happy to own the shares at the effective price.
- **Avoid earnings and major events** unless intended.
- **Convert to a bull put spread** by buying a lower put to cap the risk. See [Bull Put Spread](https://learn.tradelabsai.com/options/bull-put-spread/).

## Common mistakes

- **Selling puts on stocks you would not want to own.**
- **Using margin to sell too many puts.**
- **Chasing high premiums,** which usually signal high risk.
- **Ignoring correlation:** puts on several similar stocks can all lose together.

## Frequently asked questions

### What is a short put?

Selling a put option to collect premium, with the obligation to buy the underlying at the strike price if assigned.

### What is the maximum loss on a short put?

The strike price minus the premium received, multiplied by the contract size, which happens if the underlying falls to zero.

### Is selling puts a good way to buy stock?

It can be. If assigned, you buy at the strike minus the premium, which is below the price when you sold the put. If not assigned, you keep the premium.

Next, combine shares and calls in the [Covered Call](https://learn.tradelabsai.com/options/covered-call/).

## Continue learning

- Next lesson: [Covered Call](https://learn.tradelabsai.com/options/covered-call/)
- Previous lesson: [Long Put](https://learn.tradelabsai.com/options/long-put/)
- Related: [Long Put](https://learn.tradelabsai.com/options/long-put/): A long put is buying a put option to profit from a decline or to hedge. Learn the payoff, break even, long put vs short selling and how to choose strikes.
- Related: [Cash-Secured Put](https://learn.tradelabsai.com/options/cash-secured-put/): A cash secured put sells a put while holding cash to buy the shares if assigned. Learn the payoff, the wheel strategy, strike choice and the risks involved.
- Related: [Bull Put Spread](https://learn.tradelabsai.com/options/bull-put-spread/): A bull put spread sells a put and buys a lower strike put for a net credit. Learn the payoff, probability, strike and width choices, and how to manage losers.
- Related: [Theta Harvesting](https://learn.tradelabsai.com/options/theta-harvesting/): Theta harvesting sells options to collect time decay and the volatility risk premium. Learn the evidence, the common structures and how to survive the tail risk.
- Related: [Exercise and Assignment](https://learn.tradelabsai.com/options/exercise-and-assignment/): Exercise is when an option holder uses their right; assignment is when a seller must fulfil it. Learn the process, automatic exercise and how to manage it.