An option is not a complex financial instrument — it is simply a contract that gives you the right to buy or sell something at a fixed price before a fixed date. Once you understand this core concept, everything else — calls, puts, strikes, premiums — falls into place naturally.
What Is an Option?
An option is a financial contract between two parties. The buyer of the option gets the right — but not the obligation — to buy or sell an underlying asset at a predetermined price (the strike price) before or on a specific date (the expiry date). The seller of the option receives a payment (the premium) in exchange for taking on the obligation to fulfill the contract if the buyer chooses to exercise it.
On NSE, options are available on Nifty 50 (index options), Bank Nifty (index options), and individual stocks (stock options). Nifty 50 and Bank Nifty options are the most liquid and widely traded.
Call Options and Put Options
- Call Option (CE): Gives the buyer the right to buy the underlying asset at the strike price. You buy a Call when you expect the price to go UP. Example: Buying a Nifty 24,200 CE means you have the right to "buy" Nifty at 24,200 regardless of where it actually trades.
- Put Option (PE): Gives the buyer the right to sell the underlying asset at the strike price. You buy a Put when you expect the price to go DOWN. Example: Buying a Nifty 24,000 PE means you have the right to "sell" Nifty at 24,000 regardless of where it actually trades.
In Indian markets, most retail traders don't actually exercise options — they trade the option premium itself, buying low and selling high (for calls in bullish scenarios) or watching premiums decay (for sellers).
Key Options Terminology
- Strike Price: The fixed price at which the option gives you the right to buy (call) or sell (put). Nifty options are available in strikes separated by 50 points (e.g., 24,000, 24,050, 24,100...).
- Premium: The price you pay to buy the option contract. If a Nifty 24,200 CE is trading at ₹85, the premium is ₹85. On NSE, one Nifty options lot = 75 units. So buying one lot costs ₹85 × 75 = ₹6,375.
- Expiry: The date on which the option expires. Nifty has weekly expiries (every Thursday) and monthly expiries (last Thursday of the month). Bank Nifty has weekly expiries on Wednesday.
- ITM (In The Money): A call option is ITM when the current price is above the strike price. A put is ITM when current price is below strike. ITM options have intrinsic value.
- OTM (Out of The Money): A call is OTM when current price is below strike. A put is OTM when current price is above strike. OTM options have no intrinsic value — only time value.
- ATM (At The Money): The option whose strike price is closest to the current market price. ATM options have the highest time value and are most sensitive to price movement.
- Lot Size: NSE contracts must be traded in lots. Nifty lot size = 75. Bank Nifty lot size = 30 (check NSE for current lot sizes as they change periodically).
Intrinsic Value vs Time Value
Every option premium consists of two components:
- Intrinsic Value: The "real" value — how much the option would be worth if exercised right now. A Nifty 24,000 CE when Nifty is at 24,200 has intrinsic value of 200 points. OTM options have zero intrinsic value.
- Time Value (Theta): The extra premium the market pays for the possibility that the option moves further in your favour before expiry. Time value decays every day — this is why option buyers lose money over time if the underlying doesn't move, and why option sellers profit from time passage.
Studies of NSE F&O data consistently show that approximately 85–90% of all Nifty options expire worthless. This means the vast majority of option buyers lose money. Option sellers (who receive premium and benefit from time decay) have statistical edge. This does not mean you should only sell options — but it does mean you should understand exactly what you are doing when buying options, and why time decay works against you every single day.
Option Buyer vs Option Seller
| Option Buyer | Option Seller (Writer) | |
|---|---|---|
| Maximum profit | Unlimited (for calls) | Limited to premium received |
| Maximum loss | Limited to premium paid | Unlimited (for naked calls) |
| Time decay effect | Hurts the buyer every day | Benefits the seller every day |
| Probability of profit | Lower (~30–40% for OTM) | Higher (~60–70% for OTM) |
| Capital required | Only premium (small) | Full margin (large) |
| Risk profile | Defined risk | Unlimited risk (naked) |
Complete Nifty Options Example
Scenario: Monday, Nifty at 24,150. You expect Nifty to rise to 24,500 by Thursday expiry.
You buy: 1 lot of Nifty 24,200 CE (weekly expiry Thursday) at ₹120 premium.
Cost: ₹120 × 75 lots = ₹9,000 total investment. This is your maximum loss.
Scenario A — Nifty rises to 24,450 by Wednesday:
Your 24,200 CE now has intrinsic value of 250 points + time value. Option premium: ~₹280.
You sell at ₹280. Profit: (280–120) × 75 = ₹12,000. Return: 133% in 2 days.
Scenario B — Nifty stays at 24,150 through Thursday:
Your 24,200 CE expires worthless (Nifty below strike price).
Loss: ₹9,000 (full premium paid). 100% loss on the option.
Scenario C — Nifty falls to 23,900 by Wednesday:
Your 24,200 CE falls to ₹15 (deep OTM, minimal time value left).
You can sell at ₹15 to recover ₹1,125, or hold and risk total loss.
Most experienced traders cut losses early rather than hold to zero.
Getting Started with Options on NSE
- Enable F&O trading: Options trading requires F&O segment activation on your broker account. Submit income proof (typically 6 months bank statements or ITR) to your broker — Zerodha, Upstox, Angel One, or others.
- Start with paper trading: Before using real money, practice on Sensibull's paper trading feature. Execute 20–30 paper option trades before going live.
- Never buy OTM options on expiry day: On Thursday (Nifty expiry) or Wednesday (Bank Nifty expiry), OTM options can go from ₹100 to ₹0 within 2 hours due to time decay. Extremely high risk for buyers.
- Understand your maximum risk before every trade: When buying options, your maximum loss = premium paid × lot size. Never trade with money you cannot afford to lose completely.
Open NSE's option chain (nseindia.com → Derivatives → Option Chain → Nifty 50). Look at the current week's options. Identify ATM, ITM, and OTM strikes for both calls and puts. Note the premiums. Come back tomorrow and see how they changed. This real-world observation is worth more than any theoretical study. Read next: Option Greeks Explained Simply: Delta, Theta, Vega & Gamma.