FREEDOMWISE
Trading

What Are Options — Basics of Calls, Puts, and Strike Prices for Indian Markets

Options are contracts giving the right (not obligation) to buy or sell an asset at a fixed strike price by expiry. Indian options trade on Nifty 50, Bank Nifty, and 200+ stocks. Here is how options work — and why they are riskier than they appear.

17 May 2026

On this page

An options contract is a financial agreement that gives the buyer the right, but not the obligation, to buy or sell an underlying asset at a predetermined price (the strike) by a specific date (the expiry). In Indian markets, options trade on the Nifty 50 index, Bank Nifty, Sensex, and approximately 200+ individual stocks with sufficient liquidity. The buyer pays a premium to the seller for this right; the seller receives the premium but assumes the obligation to honour the contract if the buyer exercises. Call options give the right to buy; put options give the right to sell. While the textbook description sounds elegant ("capped downside, unlimited upside for buyers"), the practical reality is that most options expire worthless — meaning option buyers lose 100% of premium paid in the majority of cases. SEBI's research found that only 11% of retail option buyers in India are profitable in any given year, with the median profitable trader earning ~₹89,000 and the median losing trader losing ~₹1.32 lakh. Options have legitimate uses in portfolio hedging and structured income strategies, but speculative directional option buying by retail traders has near-uniformly poor expected outcomes. Freedomwise's Stock SIP Return calculator presents the alternative — predictable long-term wealth building without optionality games.

What are the components of an options contract?

Every option has six defining features:

ComponentDescriptionExample
UnderlyingThe asset on which the option is basedNifty 50, Reliance, HDFC Bank
Option typeCall or PutCall (right to buy) or Put (right to sell)
Strike pricePrice at which underlying can be bought/soldNifty 25,200 strike
Expiry dateDate the option contract terminates28-Nov-2026 (last Thursday)
PremiumPrice paid by buyer to seller₹120 per unit
Lot sizeStandardised quantity per contractNifty 50 lot: 25 units

Worked example: A Nifty 50, 25,200 strike, Call option, expiring 28-Nov-2026, priced at ₹120 premium, with lot size 25.

  • Cost to buy 1 lot: ₹120 × 25 = ₹3,000
  • The buyer has the right to buy Nifty 50 at 25,200 anytime before expiry (if European-style, only at expiry; Indian index options are European)
  • If Nifty stays below 25,200 + ₹120 (i.e., below 25,320) at expiry, the option expires worthless; buyer loses ₹3,000
  • If Nifty closes at 25,500 at expiry, option value = (25,500 − 25,200) = ₹300/unit, total ₹7,500 — buyer's profit = ₹7,500 − ₹3,000 = ₹4,500

What is the difference between calls and puts?

FeatureCall OptionPut Option
Right grantedRight to BUY underlyingRight to SELL underlying
Buyer's betUnderlying price will rise above strike + premiumUnderlying price will fall below strike − premium
Profitable whenSpot > Strike + Premium at expirySpot < Strike − Premium at expiry
Maximum loss for buyerPremium paidPremium paid
Maximum gain for buyerTheoretically unlimited (price can rise indefinitely)Strike price − Premium (price can fall to zero, but no lower)
Maximum loss for sellerUnlimitedStrike − Premium (capped because price cannot go below zero)
Maximum gain for sellerPremium receivedPremium received

Both calls and puts can be bought (long position) or sold (short position). A retail investor "buying a call" or "buying a put" has limited risk (premium paid). A retail investor "selling/writing a call" or "selling a put" has potentially unlimited or large losses.

What is moneyness — ITM, ATM, OTM?

Options are classified by the relationship between strike price and current underlying price:

TermCall optionPut option
In-the-money (ITM)Strike < Spot priceStrike > Spot price
At-the-money (ATM)Strike ≈ Spot priceStrike ≈ Spot price
Out-of-the-money (OTM)Strike > Spot priceStrike < Spot price

For Nifty 50 at 25,000:

  • Call at strike 24,800 = ITM (intrinsic value: 200; some additional time value)
  • Call at strike 25,000 = ATM (intrinsic value: 0; pure time value)
  • Call at strike 25,500 = OTM (intrinsic value: 0; pure time value, smaller)
  • Put at strike 25,500 = ITM (intrinsic value: 500)
  • Put at strike 24,500 = OTM (intrinsic value: 0)

OTM options are cheaper but require larger moves to become profitable. ITM options are more expensive but have intrinsic value protecting some of the premium from total loss.

Retail traders are systematically drawn to far OTM options because they're cheap — but these have the lowest probability of paying off. The cheap headline price disguises the low expected value.

What is time decay (theta) and why does it kill buyers?

Time decay (theta in options pricing terminology) is the daily loss of option value purely due to passage of time, holding all else constant.

Worked example: An ATM call option with 30 days to expiry might cost ₹200 in premium. Without any price movement, the same option:

  • 20 days to expiry: ₹160
  • 10 days to expiry: ₹110
  • 5 days to expiry: ₹70
  • 1 day to expiry: ₹30
  • At expiry: ₹0 (if still ATM)

The buyer must overcome this decay to be profitable. The underlying must move enough in the right direction before expiry to offset both the premium paid and the decay.

Time decay accelerates as expiry approaches — making weekly options particularly dangerous for buyers. A weekly option can lose 30–50% of its value in a single day if the underlying doesn't move favourably.

What are the Greeks in options trading?

The "Greeks" are five sensitivities that describe how an option's price changes with underlying factors:

GreekWhat it measuresPractical meaning
DeltaSensitivity to underlying price changeA delta of 0.5 means option price moves ₹0.50 for every ₹1 move in underlying
GammaSensitivity of delta to underlyingHow quickly delta changes
ThetaSensitivity to time decayDaily loss of value due to time passage
VegaSensitivity to implied volatilityOption price gain when volatility rises
RhoSensitivity to interest ratesGenerally negligible for short-term options

For practical options use, the most relevant are delta (directional exposure), theta (time decay cost), and vega (volatility exposure). Professional options traders manage portfolios of options to balance these exposures; retail traders rarely have the infrastructure to do so effectively.

Why are options harder than they appear?

Five reasons options trip up retail traders:

  1. You need direction AND timing AND magnitude. Stock investing requires direction (will it go up?). Options require all three — and being right on direction but wrong on timing or magnitude still results in losses.

  2. Implied volatility moves can offset directional bets. A correctly directional call can lose money if implied volatility drops sharply after entry — known as "volatility crush" around earnings or events.

  3. Liquidity gaps in less-traded strikes. Far OTM options can have wide bid-ask spreads, making entry and exit costly even when the trade idea was correct.

  4. Assignment risk for option sellers. Sellers can be assigned (required to fulfil the contract) early on American-style options or at expiry on European-style — sometimes when the trader didn't expect it.

  5. Complex P&L scenarios. Multi-leg options strategies (spreads, condors, butterflies) have non-linear P&L profiles that retail traders often misunderstand.

Use this on Freedomwise

Apply this to your numbers

Calculate your Freedom Score — it's free.

Get my score