An option is often the first financial product an Indian business owner meets where a small payment controls a large exposure, and where the person on the other side carries a very different risk from you. Before you look at a single price, you need to know exactly what the buyer gets, what the seller owes, and which contract terms decide the outcome on expiry day. Most expensive beginner errors in options start with a misunderstood contract, not a wrong market view. This lesson is education only, not investment advice; decisions about your own money belong with a SEBI-registered investment adviser or research analyst.
What you need to know
What an option is. An option is a standardised contract that gives its buyer a right, but not an obligation, to buy or sell a specified underlying (an index, a stock, a commodity or a currency pair) at a fixed price called the strike, on a fixed date called the expiry. The buyer pays for this right; that price is the premium. The seller, also called the writer, receives the premium and accepts the obligation that matches the buyer's right.
Calls and puts. A call gives the buyer a right linked to buying the underlying at the strike. A put gives the buyer a right linked to selling at the strike. "Call" and "put" describe the right; "long" (bought) and "short" (sold) describe your side of the contract. That gives four basic positions:
- Long call — you paid premium; you gain if the underlying ends above the strike by more than the premium.
- Short call — you received premium; you owe the difference if the underlying ends above the strike.
- Long put — you paid premium; you gain if the underlying ends below the strike by more than the premium.
- Short put — you received premium; you owe the difference if the underlying ends below the strike.
Right versus obligation is the heart of the risk. A buyer's maximum loss is the premium paid plus costs. A seller's maximum gain is the premium received, while the maximum loss is large: in theory unlimited for a short call, and up to the strike minus the premium for a short put, multiplied by the lot size. The seller is paid for accepting this uneven risk, which is why the exchange collects margin from sellers.
Contract terms you must read first. Every exchange-traded option has a published contract specification. Read these fields:
- Underlying and lot size — the number of units one contract covers. Premium is quoted per unit, so money at stake = premium × lot size.
- Strikes available and the interval between them.
- Expiry date and cycle (weekly, monthly, quarterly). Expiry weekdays and which indices carry weekly expiries have changed in recent years — check the current SEBI / exchange circular.
- Exercise style. European-style options can be exercised only at expiry; American-style at any time before it. Exchange-traded equity options in India are currently European-style — confirm on the exchange's contract page.
- Settlement method. Index options are cash-settled: only the difference changes hands. Stock options on Indian exchanges are currently physically settled: an in-the-money position at expiry can lead to actual delivery of shares. Verify in the current circular.
- Final settlement price — the reference price the exchange uses at expiry to decide who is in the money.
- Tick size and trading hours.
Payoff at expiry in one line. Per unit, a long call pays max(S − K, 0) and a long put pays max(K − S, 0), where S is the final settlement price and K the strike. Profit = payoff − premium − costs. A short position's result is the mirror image. Lesson 02 draws all four.
Before expiry, price is more than payoff. An option trading today carries time value on top of any immediate exercise value, and its price responds to volatility, time left and interest rates. Module 2 covers those drivers. For now remember that the expiry formula tells you where the contract ends, not how it behaves on the way.
The clearing corporation sits in the middle. On an exchange you are not relying on an unknown individual to honour the contract. The clearing corporation becomes the counterparty to both sides and protects itself by collecting margin from sellers — which is why a seller can be asked for more money at short notice when the market moves.
The honest context. Between buyer and seller an option is zero-sum before costs, and after brokerage, taxes and spreads it is negative-sum for participants as a group. SEBI's published studies of individual traders in equity derivatives have found that a large majority lost money. SEBI also requires brokers to display a risk disclosure on F&O; read it properly. Beginners should learn with paper trades, not leveraged real positions.
Step-by-step method
- Choose one index option and one stock option for study only; do not place orders.
- Open the exchange's official contract specification page for each (for example on the NSE website) and note underlying, lot size, strike interval, expiry cycle, exercise style and settlement method.
- Write a contract card for each using the template below.
- On each card, state in one sentence what the buyer of a call gets and what the seller of that call owes.
- Repeat the two sentences for a put on the same underlying.
- Calculate money at stake: premium × lot size for the buyer; for the seller, note that the premium is the maximum gain and calculate the loss if the underlying moves 10% against them.
- Mark which positions could lead to delivery of shares if held to expiry.
- Write the date you checked each field. Contract terms change; a card without a date is unreliable.
Worked example
Worked example
Start with the classic small-number case. A hypothetical call with strike ₹100 costs ₹6 per unit. At expiry, if the settlement price is ₹112, the payoff is ₹12 and the profit ₹6 per unit before costs. If the settlement price is ₹104, the payoff is ₹4 but the profit is −₹2: the option finished in the money and the buyer still lost. Breakeven at expiry before costs = strike + premium = ₹106.
Now scale it up. Harpreet (a fictional learner) runs a ₹4 crore-turnover auto-components unit in Ludhiana and studies options on paper. She looks at a hypothetical stock, ABC Ltd, trading at ₹1,000. For this example assume a lot size of 500 shares and a 1,050-strike call priced at ₹22.
- Buyer pays ₹22 × 500 = ₹11,000; the seller receives ₹11,000.
- Contract value at the strike: ₹1,050 × 500 = ₹5,25,000.
- Breakeven at expiry before costs: 1,050 + 22 = ₹1,072.
| Final price | Payoff per share | Buyer profit per share | Buyer total | Seller total |
|---|---|---|---|---|
| ₹1,020 | 0 | −22 | −₹11,000 | +₹11,000 |
| ₹1,080 | 30 | +8 | +₹4,000 | −₹4,000 |
| ₹1,150 | 100 | +78 | +₹39,000 | −₹39,000 |
The buyer's worst case was fixed at ₹11,000. The seller's best case was also ₹11,000, but at ₹1,150 the seller lost ₹39,000 — more than three times what was collected — and a bigger move would cost more. Because stock options are physically settled, a buyer holding to expiry at ₹1,150 would also have to pay ₹1,050 × 500 = ₹5,25,000 to take delivery unless the position was closed earlier. Harpreet's conclusion: the contract terms, not only the direction, decided the outcome.
Apply it
Template / checklist
Contract card (one per option studied):
- Underlying: __ Lot size: units (checked on __)
- Call or put: __ Strike: ₹ Expiry date: __
- Exercise style: European / American
- Settlement: cash / physical
- Premium per unit ₹__ × lot size = ₹__ per contract
- Buyer's right in one sentence: ____
- Seller's obligation in one sentence: ____
- Buyer's maximum loss: ₹__ Seller's maximum gain: ₹__
- Seller's loss if the underlying moves 10% against them: ₹____
- Breakeven at expiry before costs: ₹____
- Could this lead to delivery if held to expiry? yes / no
- Source page and date checked: ____
Common mistakes
- Treating "call" as a synonym for "buy": you can sell a call, and the short call carries the large risk.
- Reading the premium as the full cost without multiplying by the lot size — ₹22 looks small until it becomes ₹11,000.
- Assuming stock options settle in cash like index options, then discovering a delivery obligation in expiry week.
- Believing "in the money" means "in profit"; the ₹104 case shows otherwise.
- Selling options because "most options expire worthless" without calculating the loss in a large move.
- Relying on a lot size or expiry weekday remembered from an old video; exchange circulars change these.
Apply it
20-minute action task
Create two contract cards — one index option and one stock option — from the exchange's official contract specification pages. Fill every field, calculate the buyer's cash outlay using any premium visible on the option chain, and write the seller's loss if the underlying moves 10% against them. Output: two completed, dated cards in your options notebook.
Ask the AI Business Tutor
- "I am studying options on paper only. Here is my contract card: underlying [name], lot size [number], [call/put] strike ₹[strike], premium ₹[premium], settlement [cash/physical]. Explain in simple English (or Hinglish) what the buyer gets and what the seller owes, check my breakeven and maximum-loss figures, and ask me two questions to test whether I understand the difference between a right and an obligation."