Introductory Context
"Every options contract has exactly six defining characteristics: the underlying asset, the option type (call or put), the strike price, the expiry date, the lot size, and the premium. Together these six completely define your rights, your cost, and your maximum risk before you place a single order. "
Why Precision Matters Before Speed
One of the most avoidable and most common mistakes in options trading is placing an order with an incorrect understanding of what you are buying. A trader who buys the wrong expiry — selecting next month's contract when they intended the weekly — or the wrong option type — CE when they meant PE — has made a loss before the market has moved a single point. The six defining characteristics are not bureaucratic detail. They are the complete specification of your position. Knowing all six precisely is prerequisite to placing any order.
The Three Most Common Order Entry Mistakes
(1) Wrong expiry — selecting next month when you intended the weekly contract. (2) Wrong option type — CE when you meant PE, especially in a fast-moving market. (3) Wrong strike — buying one strike away from what you intended. All three are irreversible after execution. Always read the full symbol on your order form before clicking confirm.
Characteristic 1 — The Underlying Asset
The underlying is the instrument whose price determines whether the option gains or loses value. Every option references one specific underlying. In Indian markets, options underlyings fall into two broad categories:
• Nifty 50, Bank Nifty, FinNifty, Midcap Nifty, Sensex. Cash-settled — no physical delivery of shares at expiry. Settlement is in cash based on the index level at expiry. Index options:
• individual company shares — Infosys, Reliance, HDFC Bank, TCS, and approximately 180 other SEBI-approved stocks. Physically settled — if your option expires ITM, actual shares are delivered or received. Stock options:
For retail options traders, index options — particularly Nifty 50 — are the primary instrument. Superior liquidity, tighter bid-ask spreads, and cash settlement that eliminates the complexity of physical delivery. Stock options are used for specific event-driven trades by more experienced traders.
Cash Settlement vs Physical Settlement
Index options are cash-settled: if your Nifty call expires ITM, you receive the intrinsic value in cash. No shares change hands. Stock options are physically settled: if your Infosys call expires ITM and you hold it to expiry, you must purchase the underlying shares at the strike price. This creates significant capital requirements that beginners must understand before trading stock options.
Characteristic 2 — Option Type: CE or PE
Every options contract is either a Call (CE — Call European) or a Put (PE — Put European). This is the most fundamental distinction in all of options trading.
Call Option — CE
A call option gives the buyer the right — but not the obligation — to buy the underlying at the strike price on or before expiry. You buy a call when you expect the underlying to rise. If Nifty rises above your strike price before expiry, your call gains value. If Nifty falls, your call loses value — but your maximum loss is always the premium paid.
Put Option — PE
A put option gives the buyer the right — but not the obligation — to sell the underlying at the strike price on or before expiry. You buy a put when you expect the underlying to fall. If Nifty falls below your strike before expiry, your put gains value. Maximum loss: always the premium paid.
The CE/PE Memory Rule
CE = Call = right to BUY = profit when prices GO UP. PE = Put = right to SELL = profit when prices GO DOWN. One sentence each. Memorise them before your first trade and verify them on every order form before clicking confirm.
Characteristic 3 — The Strike Price
The strike price is the predetermined price at which the option buyer has the right to buy (call) or sell (put) the underlying. It is the anchor price of the contract — the number that determines whether your option expires in the money or out of the money.
On the NSE option chain, strike prices are listed at regular intervals — for Nifty, strikes are typically at 50-point intervals. If Nifty is trading at 24,150, available strikes might be 23,500, 23,550 ... 24,100, 24,150, 24,200 ... 24,800, 24,850. You choose which strike to buy based on your directional view, risk tolerance, and understanding of delta.
ITM, ATM and OTM
A call is In-the-Money (ITM) when spot is above the strike — already has intrinsic value. At-the-Money (ATM) when the strike approximately equals spot. Out-of-the-Money (OTM) when spot is below the strike — no intrinsic value yet. For puts, the logic reverses: a put is ITM when spot is below the strike.
Characteristic 4 — The Expiry Date
The expiry date is when the options contract ends. After this date, the option ceases to exist. ITM options are automatically cash-settled. OTM options expire worthless. India's F&O framework has two expiry structures:
• Nifty 50 options expire every Thursday. The most liquid weekly derivatives contract in India: Weekly expiry.
• Bank Nifty (last Wednesday), FinNifty (last Tuesday), Midcap Nifty (last Monday), and all stock options (last Thursday) expire monthly: Monthly expiry.
Always Verify Expiry Before Confirming
The most expensive order mistake in options is buying the wrong expiry. A monthly option can cost 3–4× more than a weekly option at the same strike. On your broker platform, explicitly verify the expiry date — not just the dropdown position — before clicking confirm. Particularly when markets are moving fast.
Characteristic 5 — The Lot Size
You cannot buy a single unit of a Nifty option. Options trade in standardised quantities called lots. Current lot sizes (post-November 2024 SEBI revision):
• 75 units per lot Nifty 50:
• 30 units per lot Bank Nifty:
• 65 units per lot FinNifty:
• 50 units per lot Midcap Nifty:
• varies by stock — typically 500 to 5,000 units Stock options:
The lot size determines total premium cost: premium per unit × lot size. A Nifty option at ₹120 premium costs ₹120 × 75 = ₹9,000 per lot — not ₹120. Always calculate this before placing any order.
Characteristic 6 — The Premium
The premium is the price of the options contract — the amount the buyer pays to the seller for the right the contract conveys. Premium is quoted per unit. Total cost = premium × lot size × number of lots. Premium changes continuously throughout the trading day as the underlying moves, time passes, and implied volatility shifts. Understanding premium components — intrinsic value and time value — is covered in Topics 3.16 and 3.17.
An options contract is not just a premium. It is six things simultaneously — a specific underlying, a specific right (call or put), at a specific price (strike), for a specific duration (expiry), in a specific quantity (lot size), at a specific cost (premium). Any trade that does not account for all six is incomplete. Verify all six before every single order.