Settlement and Expiry:
How Options End on NSE
Every option contract has a finite life. Understanding expiry cycles, settlement mechanics and what happens at the close of trading is essential before you hold any position overnight near expiry.
What is expiry?
Every option contract traded on NSE or BSE has a fixed expiry date — the last day on which it can be traded or exercised. After that date, the contract ceases to exist. If you hold a long option that is in the money at expiry, it is exercised and you receive the payoff. If it is out of the money, it expires worthless and you lose the premium paid.
Expiry is not something that only matters on the last day. The approach of expiry changes how an option behaves — premium decays faster, gamma spikes sharply near at-the-money strikes, and price can behave erratically. Understanding the expiry calendar is as important as understanding price levels. This lesson also sets the context for deeper topics like payoff mechanics and theta decay.
Weekly vs monthly expiry on NSE
NSE offers both weekly and monthly contracts for major indices. As of current SEBI regulations, each index is permitted one weekly expiry contract. NIFTY's weekly expiry falls every Thursday. Bank Nifty's expiry has historically been Wednesday, though SEBI periodically reviews and updates which instruments carry weekly contracts — always check your broker's contract specifications.
Monthly contracts expire on the last Thursday of the month. If any expiry day is a trading holiday, it automatically shifts to the immediately preceding trading day. Monthly contracts exist for a wider range of strikes and carry more open interest deeper into the cycle.
Stock options on NSE are settled monthly — there are no weekly stock option contracts. Monthly stock option expiries also fall on the last Thursday of the contract month.
The NSE expiry schedule in practice
At any given time, NSE lists three monthly contracts — near month, next month and far month — plus the current weekly series for eligible indices. As the near-month contract expires, a new far-month contract is introduced, keeping three monthly expiries live at all times.
Liquidity is highly concentrated in the near-expiry contract. Volume and open interest in the second or third month are much thinner, leading to wider bid-ask spreads. Most retail traders work exclusively in the current weekly or current monthly expiry.
Cash settlement vs physical settlement
This distinction matters enormously in India since SEBI changed stock derivative settlement rules:
- Index options (NIFTY, Bank Nifty, etc.) — always cash-settled. NSE computes a Final Settlement Price (FSP) and credits or debits the difference in cash. No shares change hands.
- Stock options — physically settled since October 2019 as per SEBI mandate. If you hold an in-the-money stock option to expiry, delivery of the underlying shares is triggered. This has significant margin and capital implications — your broker may square off ITM stock option positions on expiry day if you lack delivery margin.
For traders focused on NIFTY or Bank Nifty, physical settlement is not a concern. But those trading Reliance, Infosys or any stock option must plan for it explicitly.
How NSE calculates the settlement price
For index options, the Final Settlement Price is derived from the Special Opening Quotation (SOQ) — a volume-weighted average of the constituent stock prices computed at market open on expiry day. This differs from the closing price of the index the previous evening, which can lead to surprises if overnight news shifts futures sharply.
The settlement price for in-the-money options is: for a call, max(FSP − strike, 0); for a put, max(strike − FSP, 0). This intrinsic value is credited per unit and then multiplied by the lot size to arrive at the rupee credit or debit in your account.
A worked NIFTY expiry example
Suppose NIFTY is near 22,500 on Wednesday evening before a Thursday weekly expiry (hypothetical numbers). You hold one lot (75 units) of the 22,400 put, bought at a premium of Rs 60.
- Cost to enter: 60 × 75 = Rs 4,500.
- Scenario A: NIFTY opens Thursday at 22,350 (SOQ). Put is in the money. Intrinsic value = 22,400 − 22,350 = 50. Settlement credit = 50 × 75 = Rs 3,750. Net result: loss of Rs 750 (paid Rs 4,500, received Rs 3,750).
- Scenario B: NIFTY opens at 22,600 (SOQ). Put is out of the money, intrinsic value = 0. Put expires worthless. Loss = full premium = Rs 4,500.
- Scenario C: NIFTY opens at 22,200. Intrinsic value = 200. Settlement credit = 200 × 75 = Rs 15,000. Net profit = Rs 15,000 − Rs 4,500 = Rs 10,500.
Notice that you do not need to take any action — NSE automatically exercises the ITM put and credits your account. The automatic exercise is a key difference from some international markets where you must instruct the broker to exercise.
Time decay accelerates near expiry
The time value of an option decays fastest in the final days before expiry. An at-the-money option that costs Rs 200 one week out may have only Rs 30 of time value on expiry morning — all due to theta. For option buyers, holding through expiry hoping for a last-minute move is expensive; the clock is constantly eroding value. For option sellers, this decay is income. The trade-off is that gamma also spikes near expiry, meaning ATM options can move violently intraday. Expiry day tends to see sharp swings as both buyers and sellers adjust.
Common mistakes to avoid
- Confusing settlement price with closing price: The SOQ on expiry morning can differ materially from the prior day's close. Do not assume they are the same.
- Ignoring physical settlement for stock options: Holding ITM stock options to expiry without delivery margin can result in your broker force-closing the position or you receiving unexpected share delivery.
- Holding low-value OTM options to expiry: A Rs 5 option feels "free" but the transaction costs and liquidity risk make exiting it cleanly difficult. Better to close earlier at a small premium.
- Not accounting for expiry-day gap opens: The SOQ uses opening prices of constituents, which can gap significantly from the previous close, especially after US market moves or macro events overnight.
Frequently asked questions
When do NIFTY weekly options expire?
NIFTY weekly options expire every Thursday. If Thursday is a trading holiday, the expiry shifts to the immediately preceding trading day. The final settlement price is the Special Opening Quotation (SOQ) computed by NSE from individual constituent stock prices at opening on expiry day.
Are index options in India physically settled?
No. Index options (NIFTY, Bank Nifty, etc.) are cash-settled. At expiry, NSE calculates the settlement price and credits or debits the difference in cash. No actual shares change hands. Stock options on the other hand are physically settled — in-the-money stock options result in actual delivery of shares.
What happens to an in-the-money option I hold at expiry?
For index options, if your long call or put is in the money at expiry, it is automatically exercised by the exchange and the intrinsic value is credited to your account in cash. You do not need to do anything. Out-of-the-money options simply expire worthless and the premium is lost.
Why does option premium collapse near expiry?
Time value decays because the remaining time for the option to move in the money shrinks. This decay — measured by the Greek theta — accelerates as expiry approaches. An ATM option can lose a large portion of its remaining time value in the final day or two before expiry, which is why expiry day can be volatile for option buyers.
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