Call and Put Options: The Right to Choose

An option quote looks difficult until you see that it is only three numbers. The strike price is the fixed price at which the contract lets you trade. It is the ₹10 crore in the plot example. The exchange lists strikes at regular gaps, so a Nifty option chain shows 24,400, 24,500, 24,600 and so on. You pick one from the list.

The expiry is the date the right ends. After it, an unused option disappears with no value left and no extension. This is why an option is called a wasting asset. It is also why a correct view held for too long can still lose money.

The premium is the price of the option, quoted for one unit. This is where many beginners go wrong. Suppose a Nifty 24,600 call is quoted at ₹120 and the lot size is 65. The contract costs 120 × 65 = ₹7,800. The ₹120 on the screen is a rate for one unit, not the size of your trade. The lot size of 65 applies from the January 2026 series. Check the current lot size on the NSE contract page, because it is revised from time to time.

Put the three together and a fourth number follows: the breakeven. A bought call starts to make money only above the strike plus the premium, because the premium must be earned back first. A bought put starts to make money only below the strike minus the premium. Every payoff diagram you will see is these four numbers drawn as a line.

A call option is the right to buy at the strike price. You buy one when you expect the price to rise, and you pay a premium so that your loss is limited if it does not. Suppose Nifty is at 24,500 and you buy the 24,600 call for ₹120. With a lot of 65, ₹7,800 leaves your account. That ₹7,800 is now the most you can lose, whatever happens next.

For that ₹7,800 you have exposure to ₹15,92,500 of index (65 × 24,500). This is a different kind of leverage from a futures position. A bought option has no margin call, no daily debit and no chance of owing your broker money. The price for that comfort is that the option must work before its deadline, and the premium is gone whether it works or not.

Now work out the result at expiry. If Nifty ends at 24,900, your right to buy at 24,600 is worth 300 points, which is 300 × 65 = ₹19,500. You paid ₹7,800, so the profit is ₹11,700. At 24,720 you get back exactly what you paid. At 24,600 or below, the option is worth nothing and you lose all ₹7,800. Notice how large a part of the price range ends in a total loss.

This is the honest picture of a bought call. It pays well when the move is large and fast, and it punishes you otherwise. Being right about direction is not enough. The index must cross the strike, then cross the premium, and do it before expiry. Buyers who choose far strikes only because they are cheap are choosing the outcomes with the least room to work.

Remember the other side too. The seller of this call received ₹7,800. The seller keeps all of it if Nifty ends at or below 24,600. But above 24,720 the seller loses ₹65 for every extra point, and there is no upper limit to how far the index can rise.

A put option is the right to sell at the strike price. It gains value as the price falls. Two very different people use it. One is a trader who expects a fall. The other is an investor who wants to protect his shares without selling them. The second use is older and, for many people, easier to defend.

Take the same illustration. Nifty is at 24,500 and you buy the 24,400 put for ₹110. One lot costs 110 × 65 = ₹7,150, and that is the most you can lose. If Nifty falls to 24,100 at expiry, your right to sell at 24,400 is worth 300 points, which is ₹19,500. Profit is 19,500 − 7,150 = ₹12,350. The breakeven is 24,400 − 110 = 24,290. Above 24,400 at expiry the put is worth nothing.

Consider the protective use. Suppose you hold shares worth about one Nifty lot. You buy a put and your loss from a fall is limited for as long as the contract lasts. It is like the premium on a health policy. If the market rises, the put expires worthless and the premium is the cost of the cover, while your shares have gained. If the market falls, the put pays and offsets part of the fall. It does not make you a profit. It makes the loss smaller.

A put also has its own limit. The index cannot fall below zero, so the best possible gain is large but fixed, while a call can gain without a limit. And if the fall you feared never comes, the premium is spent. Some people feel they wasted money. That is a wrong way to judge a hedge: it is judged by the worry it removed, not by whether it made a profit.

On paper they are mirror images. A call gains when the price rises and a put gains when it falls. But in the market they do not always cost the same, and treating them as twins can make you overpay. Three differences matter.

The first is demand. Large investors buy puts as insurance far more often than they buy far calls to speculate. Because of this steady demand, downside options usually carry a higher price than upside options equally far from the market. This tilt is called skew. In simple words, insurance is usually more expensive than a lottery ticket in the other direction.

The second is behaviour. Markets often fall faster than they rise, and mood changes quickly in a fall. So a put can gain from direction and from rising nervousness at once, while a call can be hurt by calming nerves even when the index goes up. This is a tendency, not a rule, and it does not hold every time.

The third is purpose. A large share of call buying by small traders is short-term speculation. A large share of put buying is for protection, where the buyer expects to lose the premium and accepts it. Someone who judges a hedge only by whether it made a profit has misunderstood what he bought. Calls and puts are also linked by a rule called put-call parity, which is why one can be rebuilt from the other with the futures.

Everything so far describes what an option is worth at expiry. Most small traders do not hold that long. Before expiry the price moves for reasons that are not on the payoff diagram. Three forces act at once. A buyer can be right about direction while two of the three work against him.

The first is direction. A call gains when the index rises, but not rupee for rupee. The share of the move that reaches the option is called delta. For a far out-of-the-money option it can be well under half. So a 100-point rise in Nifty may lift such a call by only a small part of that.

The second is time. Every day that passes removes some of the chance that the option will finish in profit, so the premium falls. This is called theta, and it speeds up in the last few days before expiry. Think of a cricket match: a team needing 60 runs from 12 balls loses value every ball even if nothing else has changed.

The third is volatility, which means how large a move the market expects. When people expect big moves, premiums rise. When the mood calms, they fall. Buying just before a known event, such as a policy decision or results, often means paying a premium that is already inflated. After the event the premium can fall even if the price moved your way. This is called an IV crush. It is one of the commonest reasons a right view produces a loss.

The seller feels the same three forces in the opposite way. Time helps the seller and calming markets help the seller. A sharp move or a jump in expected swings hurts the seller.

The maximum loss on a bought option is the premium. This sounds small, and that is the danger. It is small for one contract and not small for an account. Six premiums of ₹7,800 that all expire worthless is ₹46,800, and none of them triggered a margin call or a message from the broker. A limited loss is not the same as a controlled loss. Control comes from how many lots you buy and how often.

The commonest failure is not a wrong view. It is a right view in the wrong contract. Buying a far out-of-the-money weekly option because it costs ₹15 instead of ₹150 means choosing a contract that needs a large and fast move even to break even. The low price is not a discount. It is the market’s estimate of how unlikely that move is, and that estimate is usually fair.

The second failure is holding to expiry out of hope. An out-of-the-money option with one day left has very little value and loses more every hour. Some traders hold on because there is nothing left to lose. But a small value is not zero value, and selling early can save part of the premium.

Write down what would prove you wrong before you buy. An option trade rests on three beliefs: direction, size of move and timing. If the move has not begun within the time you expected, the belief is wrong regardless of what the premium is doing. Any one of the three failing is enough to lose.