Options Basics

Exercise

Q: Do I need to exercise my option on NSE?

No. Every NSE and BSE option is European and exercise happens automatically at expiry for any contract that finishes in the money. There is no exercise button to press and no way to exercise early. Before expiry, the way to realise an option's value is to sell it in the market.

Q: What does exercise settle?

The option's intrinsic value against the final settlement price. Index options (Nifty, Bank Nifty, FinNifty, Sensex) settle in cash: the holder receives the intrinsic value per unit times the lot size, and the writer pays it. Stock options settle by physical delivery: a call holder buys the shares at the strike and a put holder sells them.

Q: Is it better to exercise or to sell an in-the-money option?

Usually to sell. The market price includes intrinsic value plus any remaining time value, so selling captures more than settlement would, and it avoids Securities Transaction Tax on exercise, which is 0.15% of intrinsic value from 1 April 2026 against 0.15% of premium on a sale. Exercise at expiry is the fallback for positions not closed in time.

Q: What is the Do Not Exercise facility?

An NSE facility, reintroduced for stock options in April 2022, that lets a holder of a marginally in-the-money stock option instruct the broker not to exercise it at expiry, avoiding physical delivery and the associated STT when the intrinsic value is too small to be worth it. It applies to stock options only; index options settle in cash and need no such choice.

Using the right an option gives you. On NSE it happens on one day, on its own, and most of the time the better move is to never let it happen at all.

In short: to exercise an option is to use its right: buy the underlying at the strike for a call, sell it at the strike for a put. On NSE and BSE, where all options are European, exercise occurs only at expiry and is automatic for every in-the-money contract; out-of-the-money contracts lapse. Index options settle in cash at intrinsic value; stock options settle by delivery of shares. Before expiry, value is realised by selling the option, not by exercising it.

The intuition

An option is a right, and exercise is the moment the right is used. In an American-style market the holder can choose that moment; in India the exchange chooses it for everyone: the close of the expiry day. The clearing corporation looks at the final settlement price, exercises every contract that is in the money, and settles the result. Nobody files a request, nobody can act early, and nobody can be surprised by timing.

That design makes exercise almost a non-event for most traders. The option's market price already reflects its intrinsic value, plus time value that exercise would throw away. So the holder who wants the value sells; the holder who does nothing is exercised automatically if in the money; and the only decision left is whether a marginally in-the-money stock option should be exercised at all, given the delivery and tax that follow.

What exercise settles

Exercised at expiry	Index options	Stock options
Long call, in the money	Receive (settlement price − strike) × lot in cash	Buy the shares at the strike (pay strike × lot)
Long put, in the money	Receive (strike − settlement price) × lot in cash	Deliver the shares at the strike (receive strike × lot)
Any option out of the money	Lapses; nothing settles	Lapses; nothing settles
STT on exercise	0.15% of intrinsic value	0.15% of intrinsic value

Worked example (illustrative numbers)

Suppose a trader holds one lot (65 units) of the Nifty 24,000 call, bought for ₹150, and on the Tuesday afternoon of expiry Nifty is at 24,120 with the call trading at ₹125.

Sell now: receive 125 × 65 = ₹8,125; STT of 0.15% on the premium is about ₹12. Net loss on the trade about ₹1,650, costs aside.
Hold to settlement: if the final settlement price is 24,120, exercise pays 120 × 65 = ₹7,800; STT on exercise is 0.15% of the intrinsic value, 0.15% × 7,800 ≈ ₹12. Net loss about ₹1,960. Selling captured ₹5 of time value and gave the same tax; holding gambled the last hour for nothing.
Hold and the market slips to 23,980 at the close: the call is out of the money, lapses, and the full ₹9,750 is lost.

The stock-option version is sharper. A 1,000 call on a stock with a lot of 500 shares that settles at 1,004 is exercised automatically: the holder must pay ₹5,00,000 for shares worth ₹5,02,000, and STT on the ₹2,000 intrinsic value is trivial, but the funds must be there. The Do Not Exercise facility exists for exactly this case.

Exercise on NSE is a settlement rule, not a decision. The only choice sits with marginal stock options, via Do Not Exercise.

Why it matters to an options trader

It sets the expiry-day plan. Knowing that in-the-money legs will be exercised and out-of-the-money legs will lapse tells you exactly what each position becomes at the close.
It is the writer's assignment. Every exercised option has a writer on the other side who is assigned; for stock options that means delivering or taking shares.
Selling beats exercising almost always. Time value is only captured by selling; exercise discards it and adds STT on intrinsic value.
No early exercise simplifies everything. Spreads, calendars and condors cannot be disturbed before expiry; the European rule removes the whole category of early-assignment risk.

Common mistakes

Looking for an exercise button. There is none; sell to realise value, or let settlement happen.
Letting a thin in-the-money stock option settle by accident. It triggers physical delivery and requires the funds or shares; use the market or the Do Not Exercise facility before the cut-off.
Assuming exercise uses the last traded price. The final settlement price is computed by the exchange from the closing period; an option that looked in the money at 15:29 can lapse on the official close.
Holding to settlement to "save" the sale's STT. Exercise also attracts STT, on intrinsic value, and gives up any time value left.

Indian-market specifics

NSE stock options have been European since contracts expiring 27 January 2011 (SEBI circular of October 2010); index options were European from launch. Automatic exercise of in-the-money contracts applies to both.
Index options settle in cash against the index's final settlement price; stock options settle by physical delivery, with delivery margins phased in over the last sessions.
NSE's Do Not Exercise facility for stock options was reintroduced from 28 April 2022, letting holders of marginally in-the-money contracts opt out of exercise and delivery through their broker before the exchange cut-off.
Securities Transaction Tax from 1 April 2026: 0.15% of intrinsic value on exercise, 0.15% of premium on sale. Expiry days: Nifty Tuesday (weekly and monthly); Bank Nifty, FinNifty, Midcap Select and stocks on the last Tuesday; Sensex Thursday on BSE.

FAQ

Do I need to exercise my option on NSE?

No. In-the-money options are exercised automatically at expiry; before that, sell to realise value.

What does exercise settle?

Intrinsic value against the final settlement price: cash for index options, share delivery for stock options.

Is it better to exercise or to sell an in-the-money option?

Usually sell: it captures time value and avoids STT on intrinsic value.

What is the Do Not Exercise facility?

An NSE option for stock-option holders to decline exercise of marginally in-the-money contracts at expiry.

Know what settles before the close

The option-chain pages show each strike's intrinsic value against the latest close, and the stock pages carry each stock's lot size, the delivery quantity if exercised. In the app, the market calendar lists every expiry with holiday shifts applied.

Nifty option chain Stock option chains

Related terms

Assignment, the writer's side of exercise
European Option, why exercise is expiry-only
Expiry
Intrinsic Value, what exercise pays