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How a call option works, how call buyers and call writers differ, and what the graph really tells you.
A call option gives the buyer the right, but not the obligation, to buy an index or stock at a fixed strike price on or before expiry, in return for a premium. The buyer's loss is limited to that premium. When the market rises, the call's price usually rises too, though by less than the market's move. The seller, also called the call writer, earns the premium but takes the loss if the market rises sharply.
A call option is a derivative contract that benefits when the underlying price rises above the strike price plus the premium paid. You can think of it as paying a small fee to lock in today's agreed price for a future date. If the market rises, the lock is valuable. If it does not, you lose only the fee. In the stock market, a call option means a contract to benefit from a price rise, and it can be bought or sold.
Every call option has a strike price, an expiry date, a premium and a lot size. The relationship between the strike and the current market price decides whether the call is in the money, at the money or out of the money.
| Term | Meaning | Illustrative value |
|---|---|---|
| Strike price | Fixed price at which the call 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 above strike | Nifty 23,000, strike 22,900 |
| At the money (ATM) | Market price near strike | Nifty 22,900, strike 22,900 |
| Out of the money (OTM) | Market price below strike | Nifty 22,800, strike 22,900 |
The premium has two parts: intrinsic value and time value. If Nifty is at 23,000 and a 22,900 call trades at Rs 180, the intrinsic value is Rs 100 and the remaining Rs 80 is time value. Time value shrinks as expiry nears.
The call option graph shows profit or loss at expiry for every possible market price. It is flat below the strike, where you lose the premium, and rises one-for-one above the breakeven, which is strike plus premium.
Common mistake: reading the graph as today's profit and loss. It shows the result at expiry. Before expiry, premium also includes time value and volatility, so the real curve sits above the graph.
If you buy one lot of a 22,900 call at Rs 100, you pay Rs 6,500 (100 x 65). You break even at 23,000 and lose the full Rs 6,500 if Nifty ends at or below 22,900. All numbers are illustrative.
| Nifty at expiry | Call value per unit | Profit or loss per unit | Per lot (65 units) |
|---|---|---|---|
| 22,800 | 0 | -100 | -Rs 6,500 |
| 22,900 | 0 | -100 | -Rs 6,500 |
| 23,000 | 100 | 0 | Rs 0 |
| 23,100 | 200 | +100 | +Rs 6,500 |
| 23,200 | 300 | +200 | +Rs 13,000 |
Charges, taxes and slippage reduce these figures. Index options on NSE are cash settled, so you receive the difference in rupees, not index units. Weekly Nifty options currently expire on Tuesday according to sources I checked, so confirm the current schedule on NSE.
Yes. When the underlying market goes up, the call option price generally goes up, and when the market falls, the call price falls. The call usually moves by only a fraction of the market's move, and that fraction is called delta.
| Call type | Typical delta (illustrative) | Premium change if Nifty rises 100 points | Premium change if Nifty falls 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 |
Using the earlier example, an at-the-money 22,900 call at Rs 100 could trade near Rs 150 if Nifty rises 100 points quickly. That is a gain of about Rs 50 per unit, or about Rs 3,250 per lot of 65, before charges. Delta changes as the market moves, so treat these figures as rough guides.
Common mistake: expecting the premium to move one-for-one with the index, or expecting a gain every time the market drifts up. Time decay and falling volatility can cancel a slow rise. Practical fix: read the delta shown in your option chain and ask whether the expected move is fast enough to beat decay.
A call option gives the right to buy and gains when the market rises. A put option gives the right to sell and gains when the market falls. Together they are the two basic types of options.
| Feature | Call option | Put option |
|---|---|---|
| Right given to buyer | To buy at the strike price | To sell at the strike price |
| Buyer expects | Price to rise | Price to fall |
| Price when market rises | Rises | Falls |
| Buyer's breakeven | Strike + premium | Strike - premium |
| Buyer's maximum loss | Premium paid | Premium paid |
| Writer expects | Market will not rise much | Market will not fall much |
Call writing means selling a call option and collecting the premium. The writer profits if the market stays below the strike plus premium, but faces rising losses if the market climbs, so the risk is not capped.
A call option is a contract, and you can take either side. Buying a call is a bullish position, and you pay the premium for the right. Selling, or writing, a call earns the premium and suits a neutral or mildly bearish view. Buying a call does not mean you own the index; you own the right to benefit from a rise.
| Call buyer | Call writer | |
|---|---|---|
| Expectation | Market will rise enough | Market will stay below strike plus premium |
| Cash flow | Pays premium | Receives premium |
| Maximum loss | Premium paid | Not capped |
| Maximum profit | Not capped | Premium received |
| Time decay | Hurts | Helps |
| Margin | Not required | Required |
A covered call is the safer form of writing: you already own the shares and sell a call against them, accepting capped upside in return for premium. Writing calls without owning the underlying is much riskier and not where I would start a beginner.
In a non-convertible debenture (NCD), a call option is the issuer's right to redeem the debenture before its maturity date at a pre-agreed price. It is not the same as a Nifty or stock call option traded on an exchange.
The investor does not choose whether it happens. An issuer usually uses the right when it can borrow more cheaply, so you may get your money back earlier than planned and have to reinvest at lower rates. Before investing, read the offer document for the call dates, the call price and any conditions.
Decide your rupee loss first, then compute the quantity. The plan below is an example of process and is not a recommendation.
| Element | Illustrative plan |
|---|---|
| Concept | Nifty is holding above a support level, so a 22,900 call is considered |
| Entry | Premium Rs 100 |
| Confirmation | Spot holds above support on a closing basis |
| Stop loss | Premium Rs 75, or spot closing below support |
| Target | Premium Rs 150 |
| Risk-reward | Risk Rs 25, reward Rs 50, RR 1:2 |
| Position size | Capital Rs 4,00,000, risk 1% = Rs 4,000. Quantity = 4,000 / 25 = 160 units, rounded down to 2 lots of 65 = 130 units (verify lot size) |
| Risk, outlay, reward | Risk 130 x 25 = Rs 3,250. Outlay 130 x 100 = Rs 13,000. Reward 130 x 50 = Rs 6,500 |
| Invalidation | Spot closes below support, or premium reaches Rs 75 |
| Mistake | Practical fix |
|---|---|
| Buying far out-of-the-money calls because they are cheap | Prefer liquid strikes close to the market price |
| Ignoring time decay | Pick an expiry that gives the idea time to work |
| Reading the graph as live profit | Remember it shows expiry payoff only |
| Writing calls for easy income | Understand uncapped risk and margin first |
| Sizing by conviction | Size from rupee risk per trade |
It is a contract that lets you benefit from a rise in price by paying a premium. You are not forced to buy, 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 rise.
You can do either. Buying a call is a bullish position with limited risk. Selling a call, called call writing, earns the premium but carries large risk if the market rises.
A call gains when the market rises and gives the right to buy. A put gains when the market falls and gives the right to sell.
It is selling a call option to earn the premium. The writer profits if the market stays below the strike plus premium and can lose heavily if it rises sharply.
It is the issuer's right to redeem the NCD early at a pre-agreed price. Check the offer document for the exact terms.
A call option is a capped-risk way to take a bullish view, as long as you respect time decay and size by rupee risk. Treat call 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.