The Expiry Day
Trading Checklist
Expiry compresses a week of theta into a single session — and amplifies every mistake. Run this checklist before 9:15 am and before every trade.
Expiry day is unlike every other trading day on NSE. The gamma of near-the-money options spikes as time remaining approaches zero — small moves in the underlying translate to outsized swings in option price. The same 50-point move in NIFTY that would shift an ATM call by 25 points on Tuesday might move it by 45 points on Thursday morning. Without a disciplined pre-trade routine, this environment turns manageable risk into catastrophic loss very quickly.
Before 9:15 am — the pre-market checklist
- Check SGX Nifty / Gift Nifty for the gap indication. A gap of more than 0.5% changes the entire morning playbook — expect a higher-volatility open and wider spreads.
- Note the previous day's OI walls. Where did the heaviest call OI and put OI close? These are your resistance and support anchors for the morning. Pull them from the NIFTY option chain.
- Note max pain. The max pain level is the strike that minimises aggregate option value at expiry. On expiry day, markets often gravitate toward it in the afternoon. Know where it is before the open.
- Check the macro calendar. RBI commentary, US pre-market data, or major corporate results that hit before 9:15 am can override the entire technical setup. If a major event is pending, size down.
- Confirm your margin buffer. Expiry day gamma spikes can trigger intraday MTM losses that approach margin limits on short positions. Confirm you have at least 30–40% headroom before entering any short options position.
The opening 30 minutes — wait before you trade
The first 15 to 30 minutes of the expiry day session are often a repricing of overnight events rather than a clean directional move. OTM options that had value the day before may gap to near-zero at open, and over-reacting to the open price is one of the most consistent ways to lose money on expiry day.
The practical rule: identify the morning high and low formed between 9:15 am and 9:45 am. That range becomes your reference. Trade the break of that range with a defined stop, rather than trying to guess the open's direction.
Mid-session checklist — before every trade
- Is the IV still elevated or has it already compressed? If IV has already fallen sharply from the open, buying premium at current prices means you are buying at deflated IV — less cushion. Check the implied volatility tracker.
- Where is NIFTY relative to max pain? If NIFTY is far from max pain (say, 300 points away), there is a possibility of a mean-reversion move toward it in the afternoon. Directional trades toward max pain have more statistical support than trades away from it.
- What is PCR doing? A rapidly falling PCR (puts being unwound) on expiry can signal that put writers are closing, which removes support. A rising PCR as NIFTY falls can signal fresh put writing — writers expect the level to hold.
- Is this a stop-hunt or a real move? Expiry day is notorious for false breakouts. A move through a well-known OI wall that immediately reverses in 2–3 candles is likely a stop-hunt rather than a genuine breakout. Wait for a candle close beyond the wall before entering.
A hypothetical afternoon scenario
Suppose NIFTY is near 22,500 by 10 am on expiry day. Max pain sits at 22,400. The 22,600 CE has 60 points of OI concentration; the 22,300 PE has heavy put OI. NIFTY is trading 100 points above max pain.
A short iron condor — selling the 22,600 CE and 22,300 PE — collects, say, 35 + 40 = 75 points total premium per lot (Rs 5,625 at lot size 75). The market needs to stay between 22,300 and 22,600 for full profit. Given that the OI walls at those strikes are defended and max pain is pulling the market lower, the probability condition is reasonable — but not guaranteed. Assign a stop: if NIFTY crosses either wing by 50 points and holds for two candles, close that leg.
The closing hour — what changes after 2 pm
After 2 pm, theta decay on OTM options accelerates sharply. OTM options that were trading at 20 points at 1:30 pm may be at 5 by 3:00 pm if the market stays range-bound. This is the window where sellers harvest the most premium per hour — but it is also where reversals carry the most pain. A 100-point NIFTY move at 2:45 pm hits gamma with full force because there is almost no time value left to absorb it.
Rules for the final hour: do not initiate new long OTM positions after 2:30 pm unless there is a very specific event catalyst. If you are short and the market is cooperative, hold, but keep a wider-than-usual mental stop because a single news headline can gap the market 150 points in under two minutes near the close.
Frequently asked questions
Which day is expiry for NIFTY and Bank Nifty?
NIFTY weekly options expire on Thursday. Bank Nifty weekly options expire on Wednesday. Monthly expiry for both indices falls on the last Thursday of the month. Always verify the exact expiry date on the NSE website as NSE may shift expiry around public holidays.
Should I carry option positions overnight into expiry day?
Carrying OTM long positions overnight into expiry day is high-risk because they can expire worthless in a single session even with a small adverse gap. Short positions held overnight carry gap risk — a sudden gap at open can immediately breach your short strike before you can react. Reduce size or close positions before the session ends the day before expiry if you cannot monitor the market actively.
What is the safest strategy on expiry day?
There is no universally safe strategy, but the approaches with the most predictable risk profiles on expiry day are: (1) selling iron condors with strikes well outside the expected range established in the morning, and (2) buying ATM straddles or strangles if an intraday event is expected and then closing before 2 pm to capture the IV before it collapses.
Check max pain and OI walls before the open
TradePulse updates max pain and OI concentration in real time so you walk into expiry day knowing exactly where the market is anchored.