Understanding the Derivatives Segment in Indian Markets

What the derivatives segment actually is

The derivatives segment is the part of the Indian market where you trade contracts that take their value from an underlying asset rather than the asset itself. The underlying can be an index like the Nifty 50 or Bank Nifty, or a single stock such as Reliance, HDFC Bank, TCS or Infosys. The two products that dominate this segment are futures and options, traded on the National Stock Exchange (NSE) and, for Sensex and Bankex products, the Bombay Stock Exchange (BSE).

What makes derivatives different from the cash or delivery segment is that you are not buying shares to hold. You are taking a position on where a price will go, using a fraction of the full contract value as margin. That leverage is the attraction and the danger. A small move in your favour multiplies your return, and the same small move against you can wipe out your margin and trigger a call for more funds. SEBI, the market regulator, sets the rules that keep this segment standardised, margined and centrally cleared.

Everything in this segment is standardised by the exchange: the underlying, the lot size, the expiry dates, the strike intervals for options and the tick size. You cannot trade a custom quantity. You trade whole lots. This is the single fact most new traders miss, and it is the first thing this guide fixes with current, accurate numbers.

Lot sizes after the November 2024 SEBI revision

In late 2024 SEBI increased the minimum contract value for index derivatives to roughly Rs 15 lakh to push casual retail traders toward bigger, more deliberate positions. As a result the headline index lot sizes changed. The Nifty 50 lot is now 65 units (it used to be 50, then 75), Bank Nifty is 30, FinNifty is 60, Nifty Midcap Select is 120, Sensex is 20 and Bankex is 30. Stock F&O lot sizes vary per stock and are revised periodically, so you must check the contract specification on the exchange before placing an order.

Why does the lot size matter so much? Because your profit or loss per point is multiplied by the lot. If you are long one Nifty future and the index moves 100 points in your favour, you do not make Rs 100. You make Rs 100 times 75, which is Rs 7,500, before costs. The same 100 point move against you is a Rs 7,500 loss. Get the lot size wrong in your position sizing and your risk is off by 50% from day one, because the old number floating around the internet is still 50.

Futures: a worked Nifty example with the current lot of 65

A futures contract is an agreement to buy or sell the underlying at a fixed price on a future expiry date. You post margin, the position is marked to market every evening, and gains or losses move in and out of your account daily until you close or it expires. Index futures are cash settled, meaning no shares change hands; only the rupee difference is exchanged.

Suppose Nifty 50 futures trade at 24,000 and you expect a rise. You buy one lot. Your notional exposure is 24,000 times 75, which is Rs 18,00,000. You do not pay that. With a typical span plus exposure margin of around 12%, you block roughly Rs 2,16,000. Say the index climbs to 24,300 and you exit. Your gross gain is 300 points times 75, which is Rs 22,500 (illustrative).

Now apply the costs that actually hit a real account. STT on futures is 0.05% on the sell side, so on the exit turnover of 24,300 times 75 (about Rs 18,22,500) that is roughly Rs 911. A discount broker charges around Rs 20 per order, so Rs 40 for buy and sell. Exchange transaction charges, SEBI fees, GST on brokerage and exchange charges, plus stamp duty on the buy side add up to roughly Rs 60 to Rs 90 more. Total costs land near Rs 1,020 to Rs 1,050, leaving a net gain of about Rs 21,500. The lesson: costs are small relative to a 300 point win, but on a 20 point scalp they can swallow the entire profit.

• Notional value: 24,000 times 75 equals Rs 18,00,000.
• Margin blocked: roughly 12%, near Rs 2,16,000.
• Gross gain on a 300 point rise: 300 times 75 equals Rs 22,500 (illustrative).
• Approximate all-in costs (STT, brokerage, GST, exchange, stamp): Rs 1,020 to Rs 1,050.
• Net gain: about Rs 21,500. A 300 point fall instead would be a roughly Rs 22,500 loss.

Options: a worked Nifty call example

An options contract gives the buyer the right, but not the obligation, to buy (a call) or sell (a put) the underlying at a fixed strike price by expiry. The buyer pays a premium and risks only that premium. The seller, or writer, collects the premium but takes on much larger, sometimes unlimited, risk and must post margin like a futures trader.

Take a buyer who thinks Nifty will rally before the weekly expiry. With Nifty at 24,000 they buy one lot of the 24,100 call at a premium of 120. Cost to enter is 120 times 75, which is Rs 9,000, and that Rs 9,000 is the maximum they can lose. The breakeven at expiry is strike plus premium, that is 24,100 plus 120, equal to 24,220. If Nifty closes at 24,400, the call is worth its intrinsic value of 300 points (24,400 minus 24,100). The position is now worth 300 times 75, which is Rs 22,500, for a gross profit of Rs 13,500 on the Rs 9,000 paid (illustrative).

Costs on the options side are dominated by STT, which is 0.15% of the sell-side premium. On exit premium of 300 times 75 (Rs 22,500) that STT is about Rs 34, plus brokerage near Rs 40, GST and exchange charges of roughly Rs 25 to Rs 40. So all-in costs are usually under Rs 110 here, and the net profit stays close to Rs 13,400. But note the other side of options: if Nifty had finished below 24,100 at expiry, the call would expire worthless and the buyer loses the entire Rs 9,000. Most weekly options bought outright expire worthless, which is why options selling and spreads are popular among experienced traders.

Weekly and monthly expiry mechanics

Expiry is the date a contract ceases to exist and is settled. Index options have become a weekly product, while stock derivatives and most futures settle monthly on the last Thursday of the month, or the previous trading day if Thursday is a holiday. SEBI moved in 2024 to limit each exchange to a single weekly index expiry to reduce expiry-day speculation, so you should check which index carries the weekly expiry on which weekday at the time you trade.

Expiry mechanics matter because of time decay. An option is a wasting asset. Every day that passes, the time value in the premium erodes, and this decay accelerates sharply in the final days before a weekly expiry. A buyer can be right about direction and still lose if the move is too slow. A seller profits from this same decay if the underlying stays away from the strike. This is the core tension that defines option strategy in the Indian weekly market.

• Index futures and index options: cash settled, no delivery of shares.
• Stock futures and stock options: physically settled at expiry, meaning in-the-money positions can result in actual delivery obligations and large margin requirements in expiry week.
• Final settlement price is based on the closing or weighted average price of the underlying near expiry.
• Never carry an in-the-money stock option to expiry casually; physical settlement can demand the full contract value or trigger penalties.

Margin and leverage: a double-edged sword

You control a large position with a small deposit because the exchange only asks for margin, the SPAN plus exposure margin that covers a worst-case daily move. For index futures this is often around 12% of notional, so roughly Rs 2.16 lakh controls an Rs 18 lakh Nifty position. That is leverage of about eight times. Sellers of options also post margin, frequently more than the premium they collect, because their downside is open-ended.

Leverage cuts both ways with brutal symmetry. The same eight times exposure that turns a 1% index move into an 8% gain on your margin turns a 1% adverse move into an 8% loss. If your margin falls below the required level after a marked-to-market loss, you face a margin call and must add funds or your broker squares off the position, often at the worst possible moment. SEBI now enforces upfront margin collection and peak margin reporting precisely to stop traders from over-leveraging beyond what they can fund.

How derivatives profits are actually taxed in India

This is where most online articles, including the old version of this page, get it wrong. Profit from trading futures and options is not a capital gain and it is not speculative. Under the Income Tax Act, gains from exchange-traded F&O are treated as non-speculative business income. That income is added to your total income and taxed at your applicable slab rate. There is no special 15% or 20% short-term rate for F&O.

Because it is business income, you can set off F&O losses against most other business income, carry forward losses for up to eight years if you file your return on time, and claim genuine expenses such as brokerage, internet, advisory fees and depreciation on equipment. If your turnover crosses the thresholds in the Income Tax Act, a tax audit under section 44AB may apply, so accurate trade-by-trade records are essential. Contrast this with the equity cash segment, where delivery-based gains are capital gains: STCG is 20% and LTCG above Rs 1.25 lakh is 12.5% after the July 2024 budget. Those equity rates do not apply to your F&O book.

On top of income tax, the Securities Transaction Tax applies to every F&O trade. Effective 1 April 2026, STT on the sell side is 0.15% of the option premium and 0.05% of futures turnover. STT is not refundable and is charged regardless of whether you make a profit, so high-frequency or scalping styles must build it into their edge. This is a tax advisor matter; consult a professional for your specific situation.

All the costs that hit an F&O trade

New traders often look only at brokerage and ignore the stack of statutory charges that decide whether a strategy is actually profitable. Below is the full set of costs that apply to a typical Indian F&O trade, every one of which you can see itemised on your broker contract note.

• Brokerage: flat fee per executed order at discount brokers, often around Rs 20, or a percentage at full-service brokers.
• Securities Transaction Tax: 0.15% of premium on the sell side for options, 0.05% on the sell side for futures.
• Exchange transaction charges: levied by NSE or BSE on turnover, different for the options and futures segments.
• GST: 18% charged on brokerage plus exchange transaction charges.
• SEBI turnover fee: a small charge per crore of turnover.
• Stamp duty: charged on the buy side, varying by state and segment.
• Depository and other charges where applicable.

For a swing trade aiming at hundreds of points, these costs are a rounding error. For an intraday scalper aiming at five to ten points, they can be the difference between a winning and a losing system. Always model the round-trip cost before deciding a strategy is viable, and keep your contract notes for tax filing.

Risk management for the derivatives trader

The leverage that makes this segment attractive is exactly why discipline is non-negotiable. The first rule is to size positions in lots that match your capital, using the current lot size, not an outdated one. With Nifty at 65 per lot and roughly Rs 6,500 of profit or loss per 100 points, a trader with a small account who risks a 150 point adverse move on one lot is risking nearly Rs 10,000 on a single trade. If that is more than 2% of your capital, the position is too big regardless of how confident you feel.

Practical safeguards include defining your maximum loss before entry, using stop-loss orders, preferring defined-risk option strategies such as spreads over naked selling, and never adding to a losing position to average down. A trading journal that records entry, exit, lot size, costs and the reason for the trade is the single most effective tool for finding and removing the leaks in your process over time.

• Size with the current lot (Nifty 65) and cap risk per trade at a fixed percentage of capital.
• Always define your maximum loss before you enter, and place a stop or hedge.
• Prefer defined-risk structures like spreads when selling options.
• Account for time decay; a slow correct move can still lose money on a long option.
• Record every trade, including costs and STT, in a journal and review it weekly.

Settlement and the role of the clearing corporation

Behind every trade sits a clearing corporation, such as NSE Clearing, which becomes the counterparty to both the buyer and the seller. This central clearing removes the risk that the person on the other side of your trade defaults, because the clearing corporation guarantees settlement. It collects margins, runs daily mark-to-market, and steps in if a member fails to pay.

Settlement happens in two layers. Daily mark-to-market moves profit and loss in and out of your account every evening based on the day's closing price. Final settlement happens at expiry: index contracts settle in cash against the final settlement price derived from the underlying, while stock contracts settle physically through delivery. Understanding which settlement applies to your contract prevents the nasty surprise of an unexpected delivery obligation or penalty in expiry week.

Common mistakes and how to avoid them

The mistakes that drain F&O accounts are predictable and avoidable. The most damaging is sizing on stale information, especially using the old Nifty lot of 50 when it is now 65, which silently increases real exposure by 30 percent. Close behind are ignoring the full cost stack, treating F&O profit as capital gains at tax time, and holding in-the-money stock options into physical settlement without the cash to take delivery.

Sources and further reading

For authoritative data and current contract specifications, refer to NSE India, BSE India, SEBI, the NSE Option Chain and the Income Tax Department. Lot sizes, STT rates, margin percentages and tax rules change. Always confirm the live figures on the official source before you trade. All numbers in this guide are illustrative and never a promise of returns.

Sources and Further Reading

For authoritative data and further reading on this topic, refer to NSE India, SEBI (Securities and Exchange Board of India), NSE Option Chain and Income Tax Department. Always confirm current rules, rates and contract specifications on the official source before you trade.