Index options in India

🎯 In 30 seconds: An index option is an option on a stock market index such as the Nifty 50 or the Sensex. Indian index options are European style and cash settled: no shares change hands, and at expiry the in-the-money amount is paid in rupees. Since November 2024 each exchange may offer weekly options on only one benchmark index, so weekly contracts exist on the Nifty 50 (NSE, expiring Tuesday) and the Sensex (BSE, expiring Thursday). Everything else is monthly. One lot is worth roughly ₹15 lakh to ₹20 lakh of index exposure, which makes even a single lot a large position for most beginners.

What an index option is

An index is a number that tracks a basket of shares (see Market indexes). You cannot buy "one Nifty" the way you buy a share. An index option lets you bet on, or hedge against, the level of the index on expiry day.

The value of one contract is the index level times the lot size. With the Nifty at a hypothetical 25,000 and a lot of 65 units, one lot represents ₹16.25 lakh of exposure. If the Nifty rises 100 points, a position worth one point per unit changes by ₹6,500.

Think of a rice trader who cannot buy all the paddy in a district, but can agree on a payment that depends on the district's average price after the harvest. Nobody delivers rice. Money changes hands based on one published number. Index options work the same way.

Which index options trade in India

As of October 2026, the main exchange-traded index options are:

Index	Exchange	Expiries	Lot size (from January 2026 contracts)
Nifty 50	NSE	Weekly (Tuesday), monthly (last Tuesday), plus quarterly and half-yearly	65
Nifty Bank	NSE	Monthly	30
Nifty Financial Services	NSE	Monthly	60
Nifty Midcap Select	NSE	Monthly	120
Nifty Next 50	NSE	Monthly	25
Sensex	BSE	Weekly (Thursday), monthly (last Thursday)	Set by BSE; check its contract page
Bankex, Sensex 50	BSE	Monthly	Set by BSE

The NSE lot sizes come from NSE's circular of 3 October 2025, which cut the Nifty lot from 75 to 65 and the Nifty Bank lot from 35 to 30, among others, from the January 2026 expiries. Lots are reviewed periodically under SEBI's rules, so always check the current figure in NSE's contract file or your broker's order window before trading.

The rules that shaped today's market

Index options in India changed more between late 2024 and 2026 than in the previous decade. The main steps:

Contract size (from 20 November 2024). SEBI's circular of 1 October 2024 raised the minimum value of an index derivative contract to ₹15 lakh at introduction, with lot sizes fixed so that the contract value is between ₹15 lakh and ₹20 lakh on the day of review. The earlier range of ₹5 lakh to ₹10 lakh had been set in 2015.
One weekly index per exchange (from 20 November 2024). Each exchange may offer weekly expiry on only one of its benchmark indices. NSE kept the Nifty 50 and BSE the Sensex. Weekly options on Nifty Bank, FinNifty and Midcap Select ended.
Expiry-day margin (from 20 November 2024). An additional 2% extreme loss margin on short index options on their expiry day.
Upfront premium and calendar spreads (from 1 February 2025). Option buyers' premium must be collected upfront, and calendar spread margin benefit is removed for contracts expiring that day.
Intraday position limit checks (from 1 April 2025). Exchanges monitor index derivative position limits at least four times a day.
Expiry days limited to Tuesday or Thursday (SEBI circular, 26 May 2025). All of an exchange's equity derivative expiries must fall on one chosen day, either Tuesday or Thursday. Apart from the one weekly benchmark index option, contracts have a minimum tenor of one month and expire in the last week of the month. Exchanges need SEBI's approval to change their expiry day.

Following the May 2025 circular, NSE moved its expiries to Tuesday and BSE to Thursday from September 2025.

Under SEBI’s circular of 26 May 2025, each exchange keeps all its equity derivative expiries on either Tuesday or Thursday, with one weekly benchmark index option. NSE chose Tuesday and BSE Thursday from September 2025.

Cash settlement, worked

Hypothetical example with the 14-day chain from Vertical spreads. You buy one lot of the Nifty 25,200 call at 192 points. The premium, 192 x 65 = ₹12,480, is collected upfront.

Max loss = premium = ₹12,480, if the final settlement price is 25,200 or lower.
Breakeven = strike + premium = 25,392.
At a settlement price of 25,500: the call is worth 300 points of intrinsic value. ₹19,500 (300 x 65) is credited in cash, for a profit of ₹7,020 before charges.

Hypothetical premium. No shares change hands: at a settlement price of 25,500 the call is worth 300 points, so ₹19,500 is credited in cash, against the ₹12,480 paid upfront. Charges, including STT on the exercised value, are not shown.

Index options are exercised automatically at expiry if they are in the money. You do not have to do anything, and no shares move. When an option is exercised, STT is charged at 0.15% of the intrinsic value, paid by the buyer (from 1 April 2026, NSE circular of March 2026). On ₹19,500 that is about ₹29. If you sell the option before expiry instead, STT is 0.15% of the premium you sell at. At the current rates the two are close; the bigger reason to close early is control over your exit price.

European style: what it does and does not mean

European style means the option can be exercised only at expiry. It does not mean you are stuck until expiry. You can sell a long option, or buy back a short one, at any time the market is open. "European" only describes exercise, not trading.

For sellers it means there is no early assignment. A short index option cannot be exercised against you on a Wednesday. Your risk is about the price before expiry and the settlement price on the day.

How the settlement price is set

Everything at expiry depends on the final settlement price, which the clearing corporation calculates from the index's underlying shares near the close. The method changed in 2026 and is changing again:

Since 3 August 2026, under SEBI's circular of 16 January 2026 introducing a closing auction session in the cash market, F&O trading runs until 3:40 pm and expiring contracts settle on closing prices discovered in that auction.
From 7 December 2026, under SEBI's circular of 15 October 2026, trading in expiring index contracts stops at 3:30 pm on expiry day, while other index and stock derivatives trade until 3:45 pm. The settlement price of expiring index contracts will be based on the index value calculated from the volume-weighted average prices of its constituents in the last 30 minutes of continuous trading, with exchanges publishing an indicative value in real time during those 30 minutes.

The practical lesson: on expiry day, the number that decides your result is not the last traded price of the option. It is a settlement value built from the underlying shares. If you hold into the close, you are accepting whatever that value turns out to be. Check the current method near any expiry.

Common mistake

Holding a cheap out-of-the-money option into the last minutes of expiry day because "it only needs a small move". The settlement value is set by the underlying shares, not by hope, and most such options settle at zero. The few that pay are not enough, on average, to cover the many that do not, plus spreads and charges. SEBI's August 2026 study found that 59% of index options turnover in FY26 was on the expiry day itself.

Index options vs stock options

	Index options	Stock options
Settlement	Cash	Physical delivery of shares
Expiries	Weekly on Nifty 50 and Sensex; monthly and longer on others	Monthly only
Minimum contract value at introduction	₹15 lakh	₹5 lakh (NSE)
Base extreme loss margin on short options (NSE)	2% of notional	3.5% of notional
Expiry-day extra 2% ELM on shorts	Yes	No (index options only)
Single-company risk	Spread across many companies	Results, governance or news at one company
Liquidity	Usually much deeper near the money	Varies widely; many strikes are thin

For hedging a diversified portfolio, index options are the natural tool (see Hedging with protective puts, collars and Nifty puts). For views on one company, stock options are the only option-based route, with physical settlement to manage.

Position limits, briefly

SEBI sets limits on how large an index option position one entity can hold. Its circular of 29 May 2025 moved these to a "future equivalent" basis, which weights options by their delta. A later framework of 1 September 2025 set entity-level intraday limits for index options of ₹5,000 crore net and ₹10,000 crore gross on that basis, monitored through at least four random snapshots a day including one near the close. These limits bind large traders, not a typical retail account, but they explain why exchanges now watch expiry-day positions closely during the session.

Tax, briefly

General information only. In India there is no special rate for index options. Profits and losses from F&O trading are generally treated as business income, reported with the rest of your income, and may bring requirements such as tax audit above certain turnover levels. Read Taxes for traders and investors in India and ask a chartered accountant. The US course chapter on index options describes a very different US tax rule; it does not apply here.

Practical tip

Before your first index option trade, write down three numbers: the current lot size, the contract value at today's index level, and what a 1% index move means in rupees for one lot. On a 25,000 Nifty with 65 units, that is ₹16.25 lakh and ₹16,250. If those numbers make you uncomfortable, the position is too big for you, whatever the premium looks like.

Try it

On NSE's website, find the current lot sizes for Nifty 50 and Nifty Bank options. Multiply each by today's index level to get the contract value. Is it between ₹15 lakh and ₹20 lakh?
Open the Nifty option chain and list the available expiries. Which are weekly, which monthly, which quarterly?
Do the same for the Sensex on BSE. Note the expiry weekday.
Pick a near-the-money call in the next weekly expiry. Write the premium in rupees per lot, the breakeven, and what you would receive at settlement if the index ended 1% above the strike.
After expiry, look up the final settlement price on NSE and check your sum.

Check yourself

Which Indian indices have weekly options as of October 2026, and on which days do they expire? Answer: The Nifty 50 on NSE, expiring on Tuesday, and the Sensex on BSE, expiring on Thursday.
Why do Nifty Bank options have no weekly expiry any more? Answer: SEBI's October 2024 circular allows each exchange weekly expiry on only one benchmark index from 20 November 2024, and NSE chose the Nifty 50.
You hold one lot (65) of the Nifty 25,200 call, bought at 192, and the final settlement price is 25,500. What happens? Answer: The option is exercised automatically and ₹19,500 is credited in cash. Profit is ₹7,020 before charges.
Does "European style" mean you cannot sell before expiry? Answer: No. It means exercise happens only at expiry. You can close the position any time the market is open.
What contract value range does SEBI require for index derivatives when lot sizes are reviewed? Answer: ₹15 lakh to ₹20 lakh.

📊 Index options in India: Nifty, Sensex, Bank Nifty and expiry days