🧯 Managing options risk: sizing, liquidity, expiry day and rolling

🎯 In 30 seconds: Options can lose money faster than shares, and some positions can lose far more than you put in. The defences are plain: know the maximum loss in rupees before every trade, size so that loss is a small part of your account, prefer positions with a defined maximum loss, trade only liquid strikes, treat expiry day as the high-risk session it is, close stock options before physical settlement unless you want delivery, and never roll a loser just to avoid booking it. SEBI's studies show most individual F&O traders lose money. Risk control is how you avoid being one of the large losers.

Start with the evidence

SEBI's August 2026 study of individual traders in equity derivatives covers FY25 and FY26. Its findings for FY26:

• 87.7% of individual traders made a net loss, down from 90.9% in FY25.
• The average loss per person was about ₹1.17 lakh.
• Options accounted for 92% of individual traders' aggregate losses.
• About 23% of traders accounted for nearly 90% of total losses.
• Individual traders paid about ₹25,000 crore in transaction costs in each of FY25 and FY26.

Earlier SEBI studies found similar loss rates. Getting F&O enabled, and what SEBI's studies found covers them. None of this means options cannot be used sensibly. It means the default outcome is a loss, and risk control is not optional.

Think of driving on a highway at night. Most trips end fine whatever you do. The rules (speed, distance, seat belt) matter on the one trip that does not. Option risk rules are the same: they look unnecessary most weeks.

1. Size every trade by its maximum loss

In shares, you size with a stop loss (see Position sizing). With many option positions you can do better: the maximum loss can be calculated exactly. Use it.

Lots = (account size x risk per trade) / maximum loss per lot, rounded down.

Hypothetical ₹5 lakh account, risking at most 2% (₹10,000) per trade, using trades from earlier chapters on a hypothetical Nifty at 25,000 with a 65-unit lot (the NSE lot from January 2026 contracts):

Two Indian features make this harder than it looks.

• The smallest trade is big. SEBI's October 2024 circular requires index derivative contracts to be worth ₹15 lakh to ₹20 lakh when lot sizes are reviewed. At 25,000 x 65, one Nifty lot is ₹16.25 lakh of exposure. A 1% Nifty move is 250 points, or ₹16,250 per lot. You cannot buy "half a lot". If one lot's maximum loss is above your limit, the answer is no trade, not a smaller one.
• Margin is not the risk. A naked short option may block ₹1 lakh or more in margin while being able to lose several times that. Never size by "how many lots my margin allows".

2. Defined risk vs undefined risk

A defined-risk position has a maximum loss you can calculate: any long option, any vertical spread, condor or butterfly. An undefined-risk position does not: naked short calls, naked short puts (limited only by the underlying going to zero), short straddles and strangles.

The naked put collects more and wins in the same places as the spread. The difference only shows on a bad day. If the Nifty falls 8%, the spread loses ₹9,230 and the naked put loses more than ₹1 lakh. Defined-risk positions are not safe, but their worst day is known in advance.

Margin points the same way. Because SPAN looks at the whole position, a spread usually needs far less margin than a naked short. Exposure margin on each short leg still applies (2% of notional for short index options, per NSE). See Vertical spreads.

3. Liquidity: the cost you do not see

Every option has a bid (what buyers pay) and an ask (what sellers want). Buy at the ask and sell at the bid, and you lose the gap. On the contract note this cost does not appear as a charge, but it comes out of your result.

• Near-the-money Nifty options in the nearest weekly expiry are usually the most active and have the tightest spreads. Far strikes, far expiries, most stock options and monthly-only indices can be much wider.
• Check open interest and volume on NSE's option chain before trading a strike. A strike with little of either may be easy to enter and hard to exit.
• Use limit orders. A market order in a thin option can fill far from the last traded price.
• Large orders. Exchanges set a quantity freeze limit per order for each contract. Orders above it are rejected and must be split. Check the current limit on NSE.

Statutory charges add up too. STT is 0.15% of premium on every option sale and 0.15% of intrinsic value on exercise, from 1 April 2026 (NSE circular, March 2026). SEBI's study found that over FY22 to FY26, individuals paid more than ₹18,500 crore in STT in the equity derivatives segment. See What trading really costs in India.

4. Expiry day: India's 0DTE

In the US, "0DTE" means options traded on their expiry day. In India the same thing happens every Tuesday on NSE (Nifty weekly) and every Thursday on BSE (Sensex weekly). SEBI's August 2026 study found that 70% of index options turnover in FY25 happened on the expiry day itself, falling to 59% in FY26 after SEBI's measures.

On expiry day, an option's time value disappears within hours. A ₹10 option can become ₹60 or zero in one afternoon. Gamma, the speed at which risk changes, is at its highest. That is why SEBI targeted expiry day in its circular of 1 October 2024:

Position limits under the last row are set for large entities. A later SEBI framework of 1 September 2025 set entity-level intraday limits for index options of ₹5,000 crore net and ₹10,000 crore gross on a delta-equivalent basis. They will not bind a retail account, but they show how closely expiry-day positions are now watched.

Closing time and settlement price. The final settlement price of expiring contracts decides your result. SEBI introduced a closing auction session in the cash market by a circular of 16 January 2026. Since 3 August 2026, F&O trading runs until 3:40 pm and expiry settlement is based on closing auction prices. SEBI's circular of 15 October 2026 changes this from 7 December 2026: trading in expiring index contracts will stop at 3:30 pm on expiry day, other index and stock derivatives will trade until 3:45 pm, and the settlement price will be based on the volume-weighted average price of the underlying (for an index, of its constituents) in the last 30 minutes of continuous trading. Check the current rules near any expiry, because they have changed twice in one year.

5. Physical settlement of stock options

Index options are cash settled. Stock options are physically settled: any stock option in the money at expiry is exercised, and the result is delivery of the full lot. A long call or short put means you must pay for the shares. A long put or short call means you must deliver them.

• Delivery margins build up before expiry. NSE Clearing's circular of 17 January 2020 set them at 10%, 25%, 45% and 70% of the computed delivery margin at the end of the fourth, third, second and last day before expiry, with full delivery obligations after expiry.
• Brokers have their own policies. Many close in-the-money stock option positions on or before expiry day if the money or shares for delivery are missing. Read your broker's policy.
• Spreads can break apart. A stock spread that ends between its strikes leaves one leg in the money and one out, so you face full delivery on the in-the-money leg. See Vertical spreads.

6. Close before expiry

Most of the profit in a short option or spread usually arrives before the last day. The last day adds margin, gamma and settlement uncertainty for little extra reward. A common discipline is to close or roll positions one trading day before expiry, and to close stock options before expiry unless you want delivery.

For long options, holding to expiry means paying STT on the intrinsic value at exercise, and the settlement price is out of your hands. Selling the option before expiry gives you control of the exit price.

7. Rolling, honestly

Rolling means closing an option and opening a similar one with a later expiry or different strike. Sometimes it is a sound new trade. Often it is a way to avoid admitting a loss.

Ask one question before every roll: "If I had no position now, would I open this new one?" If yes, roll. If no, close and take the loss. A roll that collects a small credit while moving the strike further against you does not make the loss smaller. It makes it later, and often larger.

A pre-trade checklist

1. What is the maximum loss in rupees? Is it within my per-trade limit?
2. Is the risk defined? If not, why am I accepting that?
3. What is the bid-ask spread as a share of the premium? What are the open interest and volume?
4. What events fall before expiry: results, RBI policy, the Budget, election results, major US data?
5. Will I hold into expiry day? If so, do I have the extra margin? If it is a stock option, am I ready for delivery?
6. What is my exit plan for a win, for a loss, and for "nothing happened"?
7. Have I counted brokerage, STT, exchange charges, stamp duty and GST?

Try it

1. Write down your account size (real or paper) and a per-trade risk limit, say 1% or 2%. Convert it to rupees.
2. On NSE's Nifty option chain, find three strikes in the nearest weekly expiry: one near the money, one about 3% out of the money, one about 6% out. For each, compute the bid-ask spread as a share of the mid price.
3. Build one defined-risk trade whose maximum loss per lot fits your limit. If none fits, write that down. It is a useful result.
4. Look at your broker's margin calculator for the same trade on a normal day and, if possible, on its expiry day. Note the difference.
5. Add the checklist above to the first page of your trading plan.

Sources

• SEBI (August 2026): Profitability of individual traders in the equity derivatives segment, FY25 to FY26
• SEBI circular, 1 October 2024: Measures to strengthen equity index derivatives framework
• SEBI circular, 1 September 2025: Framework for intraday position limits monitoring for equity index derivatives
• SEBI circular, 15 October 2026: Review of the closing auction session, market timings and settlement methodology for derivatives contracts
• NSE: Margins in equity derivatives
• NSE Clearing circular, 17 January 2020: Delivery margins for delivery settlement in equity derivatives
• NSE circular, 31 March 2026: Changes in rates of Securities Transaction Tax
• NSE circular, 3 October 2025: Revision in market lot of derivative contracts on indices