🎯 In 30 seconds: A protective put is a put you buy on a stock you own. It sets a floor: below the strike, every dollar the stock loses, the put gains. You pay a premium for that, and the premium is lost if nothing bad happens. A collar adds a covered call to pay for the put, which caps your upside. Index puts do the same job for a whole portfolio. Hedging is real protection with a real, ongoing cost, and it rarely fits a portfolio perfectly.
Insurance, in options terms
Car insurance has a premium, a deductible and a term. A protective put has the same three parts.
- Premium: what you pay for the put.
- Deductible: the gap between today's stock price and the put's strike. You absorb losses down to the strike yourself.
- Term: the time until the put expires. After that, you are uninsured unless you buy another one.
A put gives you the right to sell 100 shares at the strike (see Puts explained). If you own the shares and the stock collapses, you can sell them at the strike, or sell the put, which will have gained value. Either way, the loss below the strike is covered. OIC calls a put bought at the same time as the shares a "married put". The payoff is the same.
Protective put: the payoff
Hypothetical example. You own 100 shares of Company X, bought at $50. You buy one 3-month (91-day) $45 put for $0.90. The premium comes from a pricing model at 30% implied volatility, rounded.
- Maximum loss = (stock price - strike + premium) x 100 = ($50 - $45 + $0.90) x 100 = $590, however far the stock falls.
- Breakeven = stock price + premium = $50.90.
- Maximum profit = unlimited, minus the $90 premium.
Two endings show both sides. If Company X falls to $35, the shares lose $1,500 and the put is worth ($45 - $35) x 100 = $1,000. After the $90 premium, you are down $590 instead of $1,500. If Company X rises to $60, the shares gain $1,000, the put expires worthless, and you are up $910. The $90 was the cost of sleeping well.
How much protection, and at what price
A closer strike is a smaller deductible and a bigger premium. Same stock, same 91 days, same model:
| Put strike | Premium | Cost as % of stock | Max loss | Breakeven |
|---|---|---|---|---|
| $50 (at the money) | $2.75 | 5.5% | $275 | $52.75 |
| $47.50 | $1.65 | 3.3% | $415 | $51.65 |
| $45 | $0.90 | 1.8% | $590 | $50.90 |
Now the uncomfortable math. If you bought the $45 put every three months at a similar price, you would spend about 1.8% x 4 = 7.2% of the stock's value a year. Many stocks do not earn that much in a typical year. Permanent insurance on everything you own costs too much for most people. Hedges are usually bought for a specific reason and a specific period: a big gain you cannot sell yet, a concentrated position, or a known risky event.
Collars: paying for the put with a call
A collar is stock + a protective put + a covered call. The premium from the call pays for some or all of the put. In return, you give up the upside above the call's strike. It is the protective put and the covered call combined.
Hypothetical example: own 100 shares at $50, buy the 91-day $45 put for $0.90, and sell the 91-day $57.50 call for $0.85.
| Put paid | -$0.90 |
| Call received | +$0.85 |
| Net cost per share | $0.05 ($5 per collar) |
- Maximum loss = (stock price - put strike + net cost) x 100 = ($50 - $45 + $0.05) x 100 = $505.
- Maximum profit = (call strike - stock price - net cost) x 100 = ($57.50 - $50 - $0.05) x 100 = $745.
- Breakeven = stock price + net cost = $50.05.
A collar where the call pays for the whole put is called a "zero-cost collar". The cost is not zero. You paid with the upside above $57.50. If Company X jumps to $70, you get $745 instead of $2,000.
In real markets, out-of-the-money puts on stocks and indexes often cost more than calls the same distance away. That pattern is called the volatility skew. It means a zero-cost collar usually needs a call strike closer to the stock price than the put strike is.
Hedging a whole portfolio with index puts
If you own many stocks, buying a put on each is expensive and messy. Index puts let you hedge the general market with one trade. Index options are covered in Index options. Here, the key fact is size. A standard S&P 500 (SPX) option controls the index level x $100. Cboe's Mini-SPX (XSP) is one tenth of that, which suits smaller portfolios. Both are cash-settled and can only be exercised at expiration.
Step 1: measure what you are hedging. Suppose you have a $120,000 portfolio of large US stocks that moves about one-for-one with the S&P 500 (a beta of 1.0). Use a hypothetical index level of 6,000, so XSP is at 600.
Step 2: count contracts. One XSP contract covers 600 x $100 = $60,000 of index exposure. $120,000 / $60,000 = 2 contracts. If your portfolio swings more than the index, say a beta of 1.3, you would need about $156,000 of cover, so 2.6 contracts. You can only buy whole contracts, so the fit is never exact.
Step 3: choose the deductible. You buy two 3-month XSP 570 puts, 5% below the index, at a hypothetical $9.00 each. Cost: 2 x $9.00 x 100 = $1,800, or 1.5% of the portfolio.
Step 4: see what happens. If the index falls 20% to 480 by expiration:
The puts pay (570 - 480) x $100 = $9,000 each, $18,000 total, in cash. The portfolio loses $24,000. Net result after the premium: -$7,800, or 6.5%, instead of -20%. If instead the index rises 10%, the portfolio gains $12,000, the puts expire worthless, and you keep $10,200.
Choosing between them
| Approach | Cost | Upside | Best fit |
|---|---|---|---|
| Protective put | The premium, every period | Unlimited, less the premium | One stock you want to keep through a risky stretch |
| Collar | Small or none in cash | Capped at the call strike | A large gain you want to lock in a range |
| Index puts | The premium, every period | Unlimited, less the premium | A diversified portfolio that tracks the index |
| Owning less stock | Lower expected return | Smaller | Anyone who hedges all the time |
The last row matters. If you find yourself wanting protection every single month, the cheaper fix is often to hold less stock and more cash or bonds. See Diversification and correlation.
Tax notes, briefly
From IRS Publication 550 (general information, not tax advice). Buying a put on stock you have held for one year or less is generally treated as a short sale for tax purposes. Any gain on the put is then short term, and the holding period of your shares can be reset to start when the put is exercised, sold or expires. A collar can also fall under the straddle rules, which can defer losses. If the gain you are protecting is large, talk to a tax professional before you hedge. Index options like XSP can qualify for Section 1256 treatment, explained in Index options.
Try it
Open your paper trading portfolio and write down its total value. Look at the index dashboard for today's S&P 500 level. Work out:
- How many XSP contracts would cover your paper portfolio's value.
- From an XSP option chain, the cost of a 3-month put 5% below the index, as a percentage of your portfolio.
- What that cost would add up to over a year if you rolled it every quarter at the same price.
Then decide whether that yearly number is worth paying. There is no right answer, but there should be a number.
- A protective put is like insurance. What plays the part of the premium, the deductible and the term? Answer: The premium is what you pay for the put. The deductible is the gap between today’s stock price and the strike. The term is the time until the put expires.
- You own 100 shares bought at $50 and buy a $45 put for $0.90. What are the maximum loss and the breakeven? Answer: Maximum loss is $590 (($50 - $45 + $0.90) x 100). Breakeven is $50.90.
- You own shares at $50, buy a $45 put for $0.90 and sell a $57.50 call for $0.85. What are the net cost, maximum loss and maximum profit? Answer: Net cost $0.05 a share. Maximum loss $505 and maximum profit $745.
- Your $120,000 portfolio moves one-for-one with the S&P 500, and XSP is at 600. How many XSP puts cover it, and what is the main risk of relying on them? Answer: 2 contracts (each covers 600 x $100 = $60,000). The risk is basis risk: if your stocks fall for their own reasons while the index does not, the puts pay nothing.