Ready to discover one of our favorite options strategies? Welcome to the Short Put Option course! Simply put, the Short Put strategy lets you profit by essentially insuring someone else's stock at a much lower price. You get paid upfront for agreeing to potentially buy shares you want to own anyway, but at a discount in the future. It's like getting paid to shop for stocks on sale!

Picture this: Apple is trading at $109, and you're eyeing 100 shares at $105. Instead of a simple limit order, you could get paid to potentially buy those shares at your target price. How? By "insuring" someone else's Apple shares at $105.

You'll receive a premium for agreeing to buy another investor's 100 shares at $105 by a future date. They're not obligated to sell; they'll only do so if the price drops below $105.

Regardless of whether they sell, you keep the premium for taking on this obligation. This is the power of the short put strategy – generating income while waiting for your ideal entry point.

The short put is constructed by selling a put option on a stock or index. An investor with this position can be said to be holding a short put, or in more casual terms to be short a put.

A short put will always be established at a credit. In other words, you are receiving cash upfront for selling the put option.

Note: When you sell a put option, cash goes into the ‘cash’ section of the trading account. Because you sold the put option the value of the put will be negative for you under the ‘positions’ tab. This is because it will cost you that amount to buy back the put option to close the short put position.

Don’t forget that the cash you initially took in when you sold the put option is in the ‘cash’ section of your trading account.

Look at the put option quotes for Apple below. Apple was trading at $109 when this option quote was taken. To establish a short put with AAPL options, we might sell 1 AAPL Jan 20th $105 put option for $0.98 per share or $98 total.

We are now said to be short 1 contract of the Apple $105 put option. We have obligated ourselves to buy 100 shares of Apple between now and Jan 20th for $105. In return for taking on this obligation we received a risk premium of $98 into our cash account.

This is what the transaction might look like when we first place it:

The short put is a moderately bullish position. We are bullish on Apple, and expect to profit from an increase in its price or when the share price stays above the $105 short put strike price.

However, it’s a moderately bullish position since we expect the share price of Apple to stay above the $105 short put’s strike price by expiration. Above that level, the profit is capped. A more bullish investor might instead simply buy AAPL calls, use a bull call spread or buy the AAPL stock.

Investors can look at the short put strategy in 2 ways:

The maximum upside profit for a short put is limited to the net credit initially received when establishing it. This profit will be seen if the AAPL share price closes at or above the $105 strike price of the short put at expiration, no matter how high AAPL shares increase.

In our AAPL example our max profit is $98. When we compare the short put strategy to just buying the stock, you can see from the matrix below that the max profit is capped for the short put, but is unlimited for buying the stock. If you simply bought AAPL shares at $109 and the share price jumps to $120 you will make $11 per share in profit. By selling the $105 put you will only make $0.98 per share in profit. This is the only drawback of the strategy.

The counter argument is that you didn’t intend buying AAPL at $109 in the first place, you intended buying at $105, so you would not profit from the upside anyway.

The maximum downside loss for a short put is said to be unlimited. A loss will be seen if AAPL closes below the $105 strike price of the short put at expiration, minus any credit received. Since the value of AAPL (albeit unlikely) can theoretically go to zero, the risk in this trade can be substantial.

One thing you must remember about the short put strategy is that losses can mount quickly if the share price falls suddenly. That is why we encourage you to make sure that you are comfortable with the fundamentals of the company. Think of it like this, if you are not happy owning the company at the strike price, don’t place the trade.

A safer option for novice traders would be the bull put spread.

Comparing the short AAPL $105 put to simply buying the shares, you will see that they both have the same maximum loss characteristics. But we will show you later that the short put is less risky:

When you sell options (a "short" position), you might need to put up margin – funds or securities that guarantee you can fulfill your obligation if the option buyer exercises their right. Some short options are "covered" and require no margin. Calculating margin for complex strategies can be tricky, but most brokers automate this.

In our Apple example (short $105 put), the margin was $1,624. This amount isn't fixed; it fluctuates with the stock price and volatility.

A common mistake new options traders make is overusing margin, which can lead to margin calls. The key is to trade small, trade often, and be content with consistent smaller profits.

Beginners should stick to strategies with defined risk – where you know your maximum potential loss before you trade. The bull put spread is a good example. Trading on margin without understanding it is risky.

Interestingly, even though it might seem counterintuitive, the margin requirement for selling the $105 Apple put is less than the margin required for buying Apple at $109. This suggests that selling the put is actually less risky than buying the stock outright.

The best way to try and estimate return on investment for short naked option strategies is to use a ‘return on margin’ calculation. It is not perfect as margin is not a fixed number but it is the best way to compare strategies.

The return on margin formula is simply:

(Max profit potential/margin) * 100

Looking at our AAPL example:

{$98(Max Profit) / $1,624 (Margin)} * 100

= 6.03%

Now let’s compare selling the AAPL $105 put and /or buying the AAPL shares at $109.

The break-even price for a short put at expiration is a closing underlying stock price (or index level) equal to the strike price of the short put minus the credit received for the spread.

For the AAPL short $105 put example above, the breakeven price = $105 (strike price) minus $0.98 (Premium received) = $104.02.

At expiry, if AAPL finishes above $104.02 we will make a profit. This is one of the major advantages of the short put strategy over purchasing the stock. The short put strategy is less risky than buying the shares. Look at the matrix below:

A significant advantage of the short put is the "downside leeway" it provides. Apple, at $109, and with a short $105 put, has a breakeven price of $104.02. This means Apple can fall $4.98 (4.57%) before you start losing money at expiration.

Which is more likely: Apple closing above $104.02, or above $109? Clearly, $104.02 is much more probable. Most brokers will even give you the probability of profit (in our example, it was 80%).

Does this guarantee profit? No. But it significantly improves your odds. Buying shares gives you roughly a 50/50 chance of profit. The short put offers a much higher probability of success.

This is the real attraction of the short put strategy, the high probability nature of it. This of course depends on what strike prices you pick. The further out-the-money you go with the strikes, the higher the probability but with lower payoff.

At expiration, if AAPL closes at a price between the break-even price of $104.02 and the $105 strike price, a partial profit would be seen. Above the break-even price there would be a full profit; below the break-even point there would be a loss.

Here is an example of a P&L table for the AAPL Jan 20th short $105 Put option. Remember we received premium of $0.98 for selling the put option:

Before expiration, an investor can take a profit or cut a loss by purchasing the put in the marketplace. This involves buying the short put, which will be done at a net debit. Profit or loss would simply be the net difference between the credit initially received for the put and the debit paid to close it.

Since implied volatility is a key factor in the pricing of options it is best to place the short put strategy when implied volatility is high. This means that you will get paid a higher premium for the sale of the put. Any reduction in implied volatility thereafter benefits the short put position.

Theta is the rate of decay in the time value of an option. For a short put, theta (Time Decay) is positive. As each day passes time decay works in the favor of the put option seller. Let’s look at the AAPL short Jan 20th $105 put again:

You can see above that the theta value is -0.024. This means that the time value of the put option will erode by $0.024 per share or $2.40 total per day. But remember, we sold the put option so the theta value becomes a positive for us of +0.024. What does this mean? It means that $0.024 per share of time value will erode daily from the value of this option.

Now theta is working to our advantage as the value of the put option continues to decay as time passes. This is one of the main reasons we prefer to be option sellers (under the right market conditions) as opposed to option buyers.

Delta is the rate of change in the value of an option for a $1 move in the underlying share price. Let’s look at the AAPL short Jan 20th $105 put again:

You can see that the delta value is -0.224. Delta for put options is a negative number because puts go up in value as the share price falls and vice versa.

Again, we sold the $105 put option, therefore the delta sign changes to positive. We now have a +0.224 delta position in our account. This means that the value of the AAPL short $105 put will go up by $0.224 per share or $22.40 per contract for every $1 rise in AAPL and vice versa.

We can also consider delta as having 22.4 shares of AAPL. Think about it...if AAPL rose by $1 and we owned 22.4 shares we would make a profit of $22.40. The exact same as the short $105 put option position.

A couple of things to know about Delta:

Some short puts can be considered more bullish than others. The degree of bullishness depends primarily on the strike price of the short put, which determines how high the underlying stock (or index) needs to increase for maximum profit to be realized at expiration.

Assignment on any Equity option or American-style index option can, by contract terms, occur at any time before expiration, although this generally occurs when the option is in-the-money.

For an equity put option, early assignment generally occurs when the short put is deep in-the money, expiration is relatively near, and its premium has little or no time value. If a short put holder is assigned early on the short put, then he might sell shares purchased. In this case, a loss on the short put may be realized.

An investor contemplating the use of a short put should consider the consequences of early assignment, and in advance discuss with his broker a course of action to take if assigned.

If early assignment is received on a short in-the-money put, the cash settlement procedure for index options will create a debit in the investor’s brokerage account equal to the cash settlement amount. This cash amount is determined at the end of the day the long put is exercised by its owner.

The action you take at expiry will depend on where the share price is trading at:

This is a top strategy for us. Selling out-of-the-money puts offers a higher probability of profit, especially when implied volatility is high. We particularly like using this strategy around earnings announcements, as that's when volatility tends to peak.

However, the short put isn't suitable for every stock. It's crucial that the underlying company is fundamentally sound and that you're comfortable with its valuation before using this strategy.

Newer traders should consider the bull put spread as a safer alternative to the short put. The bull put spread offers defined risk, while the short put's risk is undefined. For index trading (like SPY), we prefer the put ratio spread.

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