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How a put option works, why its price rises when the market falls, and how put buyers and put writers differ.
A put option gives the buyer the right, but not the obligation, to sell an index or stock at a fixed strike price on or before expiry, in return for a premium. When the market falls, the put's price usually rises. The buyer's loss is limited to the premium, while the seller, called the put writer, takes the loss if the market falls sharply.
A put option is a derivative contract that benefits when the underlying price falls below the strike price minus the premium paid. Think of it as insurance: you pay a small fee to lock in a selling price. In the stock market, a put option is used either to profit from a fall or to protect an existing holding from one.
Every put option has a strike price, an expiry date, a premium and a lot size. Unlike a call, a put is in the money when the market price is below the strike.
| Term | Meaning | Illustrative value |
|---|---|---|
| Strike price | Fixed price at which the put can be exercised | 22,900 |
| Premium | Price paid by the buyer, quoted per unit | Rs 100 |
| Expiry | Last day the contract is valid | Weekly or monthly |
| Lot size | Units in one contract | 65 for Nifty (verify on NSE) |
| In the money (ITM) | Market price below strike | Nifty 22,800, strike 22,900 |
| At the money (ATM) | Market price near strike | Nifty 22,900, strike 22,900 |
| Out of the money (OTM) | Market price above strike | Nifty 23,000, strike 22,900 |
As with a call, the premium is intrinsic value plus time value. If Nifty is at 22,800 and a 22,900 put trades at Rs 180, the intrinsic value is Rs 100 and the other Rs 80 is time value, which shrinks as expiry approaches.
The put option graph shows profit or loss at expiry for every market price. It is flat above the strike, where you lose the premium, and slopes up to the left below the breakeven, which is strike minus premium.
Common mistake: reading the graph as today's profit and loss. It shows the result at expiry; before expiry, time value and volatility lift the real curve.
If you buy one lot of a 22,900 put at Rs 100, you pay Rs 6,500 (100 x 65). You break even at 22,800 and lose the full Rs 6,500 if Nifty ends at or above 22,900. All numbers are illustrative.
| Nifty at expiry | Put value per unit | Profit or loss per unit | Per lot (65 units) |
|---|---|---|---|
| 23,000 | 0 | -100 | -Rs 6,500 |
| 22,900 | 0 | -100 | -Rs 6,500 |
| 22,800 | 100 | 0 | Rs 0 |
| 22,700 | 200 | +100 | +Rs 6,500 |
| 22,600 | 300 | +200 | +Rs 13,000 |
Charges, taxes and slippage reduce these figures. Index options on NSE are cash settled, so you receive the rupee difference. Weekly Nifty options currently expire on Tuesday according to sources I checked, so confirm the schedule on NSE.
Yes. When the underlying market falls, the put option price generally rises, and when the market rises, the put price falls. The put moves by a fraction of the market's move, and that fraction is called delta, which is negative for puts.
| Put type | Typical delta (illustrative) | Premium change if Nifty falls 100 points | Premium change if Nifty rises 100 points |
|---|---|---|---|
| Out of the money | About -0.3 | About +Rs 30 | About -Rs 30 |
| At the money | About -0.5 | About +Rs 50 | About -Rs 50 |
| In the money | About -0.8 | About +Rs 80 | About -Rs 80 |
An at-the-money 22,900 put bought at Rs 100 could trade near Rs 150 after a quick 100-point fall, a gain of about Rs 3,250 per lot of 65 before charges. Delta changes as price moves, so treat these as rough guides.
Common mistake: buying a put just because the market looks weak, then losing to time decay while it drifts sideways. Practical fix: buy only when you expect the fall to be quick enough to beat decay, and fix the exit first.
A put option gives the right to sell and gains when the market falls. A call option gives the right to buy and gains when the market rises. They are the two basic types of options.
| Feature | Put option | Call option |
|---|---|---|
| Right given to buyer | To sell at the strike price | To buy at the strike price |
| Buyer expects | Price to fall | Price to rise |
| Price when market falls | Rises | Falls |
| Buyer's breakeven | Strike - premium | Strike + premium |
| Buyer's maximum loss | Premium paid | Premium paid |
| Writer expects | Market will not fall much | Market will not rise much |
Put writing means selling a put option and collecting the premium. The writer profits if the market stays above the strike minus premium, but faces rising losses if the market falls, so the loss can be very large.
A put option is a contract, and you can take either side. Buying a put is a bearish or protective position, and you pay the premium. Selling, or writing, a put earns the premium and suits a neutral to mildly bullish view. Buying a put does not mean you are selling the market today; you own the right to sell at the strike.
| Put buyer | Put writer | |
|---|---|---|
| Cash flow | Pays premium | Receives premium |
| Maximum loss | Premium paid | Very large, as the market can fall far |
| Maximum profit | Large, as the market falls | Premium received |
| Time decay | Hurts | Helps |
| Margin | Not required | Required |
Writers often feel safe because most puts expire worthless, but a sharp fall can erase many small wins. I would not start a beginner on naked put writing.
A protective put is a put bought against shares you already own. It sets a floor under your loss, and the premium is the price of that insurance.
Illustrative example: you own a stock bought at Rs 1,000 and buy a 950 put for Rs 20 per share. If the stock falls to Rs 700, you can still sell at 950. Your loss per share is limited to (1,000 - 950) + 20 = Rs 70, before charges, instead of Rs 300. If the stock rises, you keep the gain minus the Rs 20 you paid. Stock options trade in lots, so check the lot size and settlement rules on NSE first.
Decide your rupee loss first, then compute the quantity. The plan below shows the process and is not a recommendation.
| Element | Illustrative plan |
|---|---|
| Concept | Nifty is failing at a resistance level, so a 22,900 put is considered |
| Entry | Premium Rs 120 |
| Confirmation | Spot closes back below resistance and stays there |
| Stop loss | Premium Rs 90, or spot closing above resistance |
| Target | Premium Rs 180 |
| Risk-reward | Risk Rs 30, reward Rs 60, RR 1:2 |
| Position size | Capital Rs 4,00,000, risk 1% = Rs 4,000. Quantity = 4,000 / 30 = 133 units, rounded down to 2 lots of 65 = 130 units (verify lot size) |
| Risk, outlay, reward | Risk 130 x 30 = Rs 3,900. Outlay 130 x 120 = Rs 15,600. Reward 130 x 60 = Rs 7,800 |
| Invalidation | Spot closes above resistance, or premium reaches Rs 90 |
| Mistake | Practical fix |
|---|---|
| Buying a put only because the market "looks weak" | Wait for confirmation and a defined level |
| Ignoring time decay | Choose an expiry that gives the fall time to happen |
| Buying after a big fall, when premiums are inflated | Check volatility before buying |
| Writing puts for easy income | Understand the large loss risk and margin first |
| Sizing by conviction | Size from rupee risk per trade |
It is a contract that lets you benefit from a fall in price, or protect a holding, by paying a premium. You are not forced to sell, and your loss is limited to the premium.
Yes, generally. The premium rises by a fraction of the market's move, called delta, but time decay and falling volatility can offset a slow fall.
You can do either. Buying a put is a bearish or protective position with limited risk. Selling a put, called put writing, earns the premium but carries large risk if the market falls.
A put gains when the market falls and gives the right to sell. A call gains when the market rises and gives the right to buy.
It is selling a put option to earn the premium. The writer profits if the market stays above the strike minus premium and can lose heavily if it falls sharply.
Yes. Buying a put against shares you own, a protective put, sets a floor under your loss, at the cost of the premium.
A put option is a capped-risk way to take a bearish view or insure a holding, as long as you respect time decay and size by rupee risk. Treat put writing as a separate, higher-risk skill. If you cannot draw the payoff graph from memory, you are not ready to trade the option.
More lessons: Trading Direction blog.