Expiry Date
The expiry date is the day an option contract ceases to exist and is settled — Indian index options have weekly and monthly expiries, and the closer expiry gets, the faster time value decays.
Quick Answer
The expiry date is the deadline on which an option is settled and ceases to exist. Indian index options expire weekly and monthly, and time value decays fastest in the final days. A weekly Nifty option with three days left can lose most of its remaining time value if the index barely moves.
Expiry Date — key takeaways
The expiry date is the option's deadline and the engine of time decay. Weekly options decay fast and suit short views; monthlies give room for positional trades. Match expiry to your horizon, respect accelerating Theta, and mind physical settlement on stock options.
Expiry Date at a glance
| Indian expiries | Weekly + monthly |
|---|---|
| Index settlement | Cash |
| Stock settlement | Physical delivery |
Expiry Date in simple words
Every option has a deadline. On the expiry date, the option is settled: in-the-money options pay out their intrinsic value and out-of-the-money options expire worthless. As expiry approaches, an option loses time value faster and faster. Nifty has weekly expiries (every week), while Nifty and Bank Nifty both have monthly expiries (last week of the month).
How Expiry Date behaves — visual
Expiry Date — detailed explanation
Weekly and monthly expiries in India
The NSE offers a weekly expiry for its flagship index (Nifty) plus a monthly expiry that falls in the last week of each month. Since the change effective for contracts expiring on or after 1 September 2025 (NSE circular NSE/FAOP/68747, dated 25 June 2025), NSE index and stock derivatives expire on Tuesday: weekly Nifty options expire on the Tuesday of their expiry week, and every monthly contract expires on the last Tuesday of the month. Until then, NSE index options expired on Thursday. (BSE contracts such as Sensex and Bankex keep their own, separate expiry schedule.) Weekly options are shorter-dated, cheaper, and decay fast, making them popular for short-term and expiry-day trading. Monthly options have more time value and are used for longer views and positional strategies. Always check the current NSE calendar, as expiry days and product schedules are revised periodically.
Why expiry drives time decay
An option's premium includes time value that reflects the chance of a favourable move before expiry. As the expiry date nears, that window shrinks, so time value melts toward zero — this is Theta, and it accelerates. A weekly option can lose a large share of its value in its final two or three sessions. Choosing the right expiry means giving your thesis enough time to play out without paying for time you don't need.
Expiry-day dynamics
On expiry day, options behave dramatically. At-the-money options have enormous Gamma, so their Delta swings violently on small moves, and time value evaporates by the close. This makes expiry day a specialist's game — rich in opportunity for sellers harvesting the final decay, but dangerous for anyone caught on the wrong side of a sharp move with no time left to recover. 'Zero-days-to-expiry' (0DTE) trading has become hugely popular on Indian indices for exactly this volatility.
Settlement at expiry
Indian index options are cash-settled: at expiry, the difference between the settlement price and the strike is credited or debited in cash, with no delivery. Stock options, however, are physically settled — an in-the-money position can result in an obligation to deliver or take delivery of shares, which carries large settlement and margin implications. Traders must close in-the-money stock options before expiry unless they intend physical delivery.
Expiry Date — practical example (Nifty)
Illustrative — Nifty, lot size 65
It is Wednesday, with a Nifty weekly option expiring the following Tuesday. You buy a 20,000 CE for ₹120. If Nifty stays flat, Theta might erase it to ₹90 by Friday, ₹55 by Monday and near ₹5–10 by Tuesday afternoon — the decay accelerates each day. The same ₹120 of time value in a monthly option, with weeks left, would barely move over those days. The expiry you choose changes the entire character of the trade.
Why Expiry Date matters in practice
- Weekly options decay fast and suit short-term views; monthly options give more time for positional trades.
- Time decay accelerates as expiry nears — a weekly can lose most of its value in the final sessions.
- Expiry day has extreme Gamma and vanishing time value — a specialist environment.
- Index options are cash-settled; in-the-money stock options can trigger physical delivery obligations.
Common mistakes with Expiry Date
- Buying weekly options and holding them flat, watching accelerating Theta destroy the premium.
- Choosing an expiry too short for the thesis, so the move happens after the option has expired.
- Holding in-the-money stock options into expiry and being surprised by physical settlement obligations.
- Trading expiry day without respecting the extreme Gamma that turns small moves into large P&L swings.
How professionals use Expiry Date
Professionals match expiry to their time horizon — buying enough time for a thesis to work while avoiding paying for excess. Sellers often favour the back end of the cycle to harvest decay, then step aside from the most Gamma-heavy final sessions unless they are expiry specialists. They track the NSE expiry calendar closely and always close in-the-money stock options before physical settlement forces an unwanted delivery.
Expiry Date — frequently asked questions
What is the expiry date of an option?
The expiry date is the day an option contract ends and is settled. In-the-money options pay their intrinsic value; out-of-the-money options expire worthless.
What is the difference between weekly and monthly expiry?
Weekly options expire each week and decay quickly, suiting short-term trades. Monthly options expire in the last week of the month, carry more time value, and suit positional strategies.
Why do options lose value as expiry approaches?
Because time value reflects the chance of a favourable move before expiry, and that window shrinks as expiry nears. This decay, measured by Theta, accelerates in the final days.
Are Nifty options cash-settled at expiry?
Yes. Nifty and other index options are cash-settled — the profit or loss is settled in cash. Stock options are physically settled and can require share delivery.
What happens if my option is in-the-money at expiry?
For index options it is auto-exercised and cash-settled for its intrinsic value. For stock options, being in-the-money can trigger physical delivery obligations.
Which expiry should I trade?
Match the expiry to your view's time horizon. Short, fast trades suit weeklies; multi-week positional views suit monthlies. Avoid paying for more time than your thesis needs, but don't buy too little.
Why is expiry day so volatile?
At-the-money options have very high Gamma near expiry, so their Delta changes sharply on small moves, while time value disappears by the close — producing large, fast P&L swings.
Can I sell my option before expiry?
Yes. You can close or 'square off' an option any time before expiry by taking the opposite trade, locking in the current profit or loss rather than waiting for settlement.
People also ask about Expiry Date
These questions are answered in detail on their own pages:
Sources & references
Published 1 July 2026 · Updated 18 July 2026. Educational content only — not investment advice.