The Expiry Timeline: What Happens, and When

A chronological walkthrough of the days and hours around expiry — from theta build-up in the preceding days to the final settlement window and next-day payout.

Expiry Timeline: In the days before expiry theta and gamma build; expiry-day trading runs normally until the last 30 minutes (roughly 3:00–3:30 PM), when the underlying's weighted average sets the final settlement price; at the 3:30 PM close positions are auto-exercised or lapse, and cash settlement follows on T+1.

The days before expiry

Expiry is not a single moment — its effects build for days beforehand.

One to two weeks out: options still hold meaningful time value; theta is present but moderate; gamma is low unless the underlying is very close to a strike.
Final week: theta accelerates as time value shrinks toward zero — see theta acceleration and the time-decay curve. At-the-money gamma starts to climb.
One to two days out: gamma near the money can be very high — see gamma risk and gamma near expiry. Positions near a strike become sensitive to small index moves, and the market's open interest concentration starts to hint at a possible max pain level.

Expiry-day morning

Trading opens normally. Liquidity is typically high in the current-week/current-month contract as it is the most actively traded series. Traders finalise their hold-or-square-off decisions for positions that are in or near the money — see exercise vs expiry.

Intraday: the session builds toward the close

Through the day, gamma and theta continue to intensify for near-the-money strikes. Open-interest changes and price action are watched for signs of where the underlying may gravitate — the max pain and gamma exposure from the option chain are common reference points, though neither guarantees where the market will actually settle.

The last 30 minutes: 3:00 PM – 3:30 PM

This is the most consequential window of the day. For index derivatives, the final settlement price is computed as the volume-weighted average price of the underlying over this exact 30-minute window — not the single closing tick. See settlement price for the calculation. Because the settlement price is an average over time rather than a single print, the underlying's path through this half hour — not just where it ends up — determines the outcome. Positions near a strike are exposed to pin risk during this window, since the average can land on either side of the strike.

The close: 3:30 PM

Normal trading stops. No further trades in the expiring contract are possible. The exchange fixes the final settlement price from the last-30-minute average. In-the-money options are flagged for auto-exercise; out-of-the-money options lapse worthless. Futures are marked to the settlement price and closed out.

After the close: obligations are computed

The clearing corporation nets each account's obligations: cash to be paid or received for index options and futures, and share-delivery obligations for in-the-money stock options — see the settlement guide for the cash-vs-physical mechanics and ITM settlement for what an in-the-money holder should expect.

T+1: settlement completes

On the next working day, cash-settlement proceeds are typically credited or debited, and physical-delivery shares move into or out of demat accounts. From this point, the expired contract no longer exists in any trading account.

To check exactly how many days remain before any of this begins for a given contract, use the days-to-expiry tool and the expiry calendar.

Frequently asked questions

What time does options trading stop on expiry day?

At the normal market close, 3:30 PM IST. No further trading in that expiring contract is possible after this time.

What is the last-30-minute settlement window?

It is the period from roughly 3:00 PM to 3:30 PM on expiry day, over which the underlying's volume-weighted average price is calculated to set the final settlement price.

Why does theta accelerate close to expiry?

Because an option's time value shrinks as the deadline nears and there is less remaining time for the underlying to move, so each passing day removes a larger share of the option's dwindling time value.

When does gamma peak during the expiry timeline?

Gamma for at-the-money strikes typically peaks in the final one to two days before expiry, and especially during the last trading session itself.

What happens immediately after the 3:30 PM close on expiry day?

The final settlement price is fixed, in-the-money options are flagged for auto-exercise, out-of-the-money options lapse, and futures are marked to the settlement price.

When do I receive money from a cash-settled expiry?

Typically on a T+1 basis — the working day after expiry — once the clearing corporation processes net obligations.

Is the settlement price the same as the closing price?

No. It is the weighted average of the underlying over the last 30 minutes, which can differ from the single last-traded price at 3:30 PM.

Why is pin risk highest during the last 30 minutes?

Because the averaging window means the underlying's path — not just its final tick — determines the settlement price, so a strike the market hovers near can settle on either side, changing the option's fate.

Does anything change on the day before expiry?

Yes — theta and gamma are typically already elevated one to two days out, especially for at-the-money strikes, even though the most dramatic effects concentrate on expiry day itself.

Last reviewed 11 July 2026. Educational content only — not investment advice.