Call vs Put Options in India: A Nifty Example with Real Rupee Math

Call vs Put in One Clear Picture

A call option is a contract that gives the buyer the right, but not the obligation, to buy the underlying at a fixed strike price on or before expiry. You buy a call when you expect the price to go up. A put option gives the buyer the right, but not the obligation, to sell the underlying at the strike price. You buy a put when you expect the price to go down. For every buyer there is a seller (also called a writer) on the other side who collects the premium and takes the opposite view.

In India, almost all index options are cash settled. That means no actual shares or index units change hands. On expiry the exchange simply pays the difference in cash. So when people say you exercise a Nifty call, what really happens is your in the money value is credited to your account in rupees. This is very different from the textbook idea of buying shares at the strike, and it matters for how you calculate profit and loss.

The four basic positions are: buy call (bullish, limited risk), sell call (bearish or neutral, large risk), buy put (bearish, limited risk) and sell put (bullish or neutral, large risk). Beginners almost always start as buyers because the loss is capped at the premium. Sellers earn the premium up front but must post margin and can lose multiples of what they collected if the market moves hard against them.

Why the Lot Size of 65 Changes Everything

You cannot buy a single Nifty option. The exchange fixes a lot size, and for Nifty 50 options that lot size is 65 (revised from the older 50 and 25 in the November 2024 contract overhaul). This means the premium you see quoted, say 120, is the price for one unit, and you pay 120 times 65 for one lot. The lot size is the bridge between the small premium numbers on screen and the real rupees moving in and out of your account.

Here is the single most useful rule for a Nifty options trader. Because the lot is 65, every 1 point move in the premium equals Rs 65 per lot. So if a premium rises from 120 to 140, that is a 20 point gain, which is 20 times 65, or Rs 1,300 of profit per lot. If you hold 4 lots, the same move is Rs 5,200. This simple multiplication lets you size positions and set targets in rupees instead of guessing.

Worked Example: Buying a Nifty Call Option

Let us use realistic, illustrative numbers. Suppose Nifty 50 is trading at 22,000 and you are bullish ahead of the weekly expiry. You buy one lot of the 22,000 CE (call) at a premium of 120. Because the lot size is 65, your total premium outlay is 120 times 75, which equals Rs 9,000. This Rs 9,000 is the most you can lose. That is the entire appeal of buying options: defined, capped risk.

Now say Nifty rallies to 22,200 by the next day. Your 22,000 call is now 200 points in the money, and with a little time value left the premium might be around 215. You sell to close. Your gain per unit is 215 minus 120, which is 95 points. In rupees that is 95 times 75, or Rs 7,125 of gross profit per lot, on a Rs 9,000 outlay. That is the leverage at work, and also the warning: the same leverage works in reverse.

If instead Nifty had fallen and stayed below 22,000 until expiry, the 22,000 call would expire worthless. You would lose the full Rs 9,000 premium and nothing more. Notice the asymmetry: limited loss, large potential gain. That is why first time traders are usually steered toward buying rather than selling.

• Premium paid: 120 points times 75 = Rs 9,000 (your maximum loss).
• Breakeven at expiry: strike plus premium = 22,000 plus 120 = 22,120 on Nifty.
• Exit at premium 215: profit of 95 points times 75 = Rs 7,125 gross per lot.
• If Nifty closes at or below 22,000 on expiry: option is worthless, full Rs 9,000 lost.

Worked Example: Buying a Nifty Put Option

Puts mirror calls in the opposite direction. Stay with Nifty at 22,000, but now you expect a fall, perhaps before a major event. You buy one lot of the 22,000 PE (put) at a premium of 110. Your outlay is 110 times 75, which is Rs 8,250, and again that is your maximum loss. The breakeven at expiry is the strike minus the premium, so 22,000 minus 110 equals 21,890. Nifty has to close below 21,890 on expiry for you to be in profit on an expiry basis.

Suppose Nifty drops to 21,750. Your 22,000 put is now 250 points in the money. With some time value the premium might trade around 280. You sell to close for a gain of 280 minus 110, which is 170 points. In rupees that is 170 times 75, or Rs 12,750 gross profit per lot. If Nifty had instead risen and stayed above 22,000, the put would expire worthless and you would lose the full Rs 8,250.

The Seller's Side: Higher Margin, Different Math

When you sell a Nifty 22,000 call at 120, you receive 120 times 75, which is Rs 9,000 credited to your account. That is your maximum profit. But your loss is open ended, because if Nifty rallies sharply the call premium can balloon. If the premium runs to 300, you are sitting on a loss of 300 minus 120, which is 180 points, or 180 times 75, equal to Rs 13,500 per lot, and it can keep growing. This is why SEBI and the exchanges require sellers to post substantial margin, often well over Rs 1 lakh per Nifty lot depending on volatility.

Option sellers are betting on time decay and on the price staying away from the strike. They win small and often, but a single violent move can wipe out many weeks of premium income. Selling naked (uncovered) options is for experienced traders with strict stop losses and enough capital to absorb a gap move. Most retail traders who sell do so inside defined risk spreads, such as a bull put spread or an iron condor, where a bought option caps the loss.

Time Decay, Expiry and Moneyness

An option premium has two parts: intrinsic value (how far it is in the money) and time value (everything else, driven mostly by time left and volatility). A Nifty 22,000 call when Nifty is at 22,050 has 50 points of intrinsic value. The rest of its premium is time value that melts away as expiry approaches. This melting is called time decay, or theta, and it is brutal in the last two or three days, especially for at the money options on expiry day itself.

Nifty offers weekly expiries (currently expiring on Tuesday) and a monthly expiry (the last weekly of the month). Weekly options are cheaper because they have less time value, but they decay fast, so they punish buyers who are wrong even briefly. Monthly options cost more but give your view more room and time to play out. SEBI tightened the rules in late 2024 so that each exchange offers weekly expiry on only one index, which reduced the expiry day churn that was hurting small traders.

• In the money (ITM): strike already favourable, has intrinsic value, behaves more like the underlying.
• At the money (ATM): strike near the current price, highest time value and fastest decay.
• Out of the money (OTM): strike not yet favourable, cheap, all time value, can expire worthless quickly.
• Theta (time decay) hurts buyers and helps sellers, and it accelerates near expiry.
• Implied volatility lifts all premiums before big events and collapses after, often hurting buyers even when direction is right.

Costs That Quietly Eat Your Profit

Screen profits are not pocket profits. Indian options carry several charges. Securities Transaction Tax (STT) on options is charged on the sell side at 0.15 percent of the premium value (raised from 0.0625 percent to 0.1 percent effective 1 October 2024, then to 0.15 percent from 1 April 2026). There is a critical trap: if you let an in the money option get exercised at expiry instead of selling it, STT is charged at a much higher rate on the full settlement value, which can be a nasty surprise. Most active traders square off before expiry to avoid this.

On top of STT you pay brokerage (many discount brokers charge a flat Rs 20 per executed order), exchange transaction charges, 18 percent GST on brokerage and transaction charges, SEBI turnover fees and stamp duty on the buy side. For our Nifty call example, a flat Rs 20 in plus Rs 20 out, plus STT of roughly Rs 16 on a Rs 16,125 sell value, plus GST and small statutory charges, might total in the region of Rs 70 to Rs 100 round trip per lot. That is small against a Rs 7,125 gain but it can turn a thin scalp into a loss. Treat these as illustrative; confirm exact rates with your broker.

How Options Profits Are Taxed in India

This is where many traders get it wrong. Profit from trading futures and options is not capital gains. It is treated as business income under the head Profits and Gains of Business or Profession, and it is taxed at your normal income tax slab rate. So if you fall in the 30 percent slab, your net F&O profit is taxed at roughly 30 percent plus cess, not at a special lower rate. You can deduct genuine trading expenses such as brokerage, internet, advisory fees and depreciation on equipment.

By contrast, the special rates of 20 percent short term capital gains and 12.5 percent long term capital gains above Rs 1.25 lakh apply to delivery based equity investing, not to F&O. Because options are business income, your gains add to your total income and can also be set off against business losses, subject to the Income Tax Act rules. Maintain clean records of every trade, because the tax department treats active F&O as a business and may require an audit if turnover crosses the threshold. When in doubt, consult a qualified chartered accountant.

Common Mistakes Beginners Make

The most expensive beginner mistake is buying cheap, far out of the money weekly options because they cost little, then watching them decay to zero even when the index barely moves. A 22,400 call when Nifty is at 22,000 might cost only 25 points, which feels affordable at Rs 1,875 per lot, but it needs a fast, large move just to break even. Most weeks, that move does not come, and time decay quietly destroys the premium.

The second mistake is ignoring position size. Because one Nifty lot controls 65 units, a small premium swing is real money. Traders who buy five or ten lots on a hunch can lose Rs 30,000 or more in minutes. The third mistake is selling naked options for the premium without understanding the open ended risk, and the fourth is holding to expiry and getting hit by the higher STT on exercised options. Plan your exit before you enter.

• Buying far OTM weekly options that need a big fast move just to break even.
• Oversizing: forgetting that 1 lot equals 65 units, so every point is Rs 65.
• Selling naked calls or puts without defining maximum loss.
• Letting ITM options get exercised at expiry and paying the higher STT.
• Trading around major events when implied volatility is inflated, then losing to the volatility crush even when direction is right.

Sources and Further Reading

For authoritative data and current contract specifications, refer to the NSE Option Chain, NSE India, SEBI and Zerodha Varsity. Lot sizes, STT rates, expiry days and margin requirements change from time to time, so always confirm the current rules, rates and contract specifications on the official source before you place a trade. All numbers in this guide are illustrative and are not a promise of any return.

Sources and Further Reading

For authoritative data and further reading on this topic, refer to NSE Option Chain, NSE India, SEBI (Securities and Exchange Board of India) and Zerodha Varsity. Always confirm current rules, rates and contract specifications on the official source before you trade.