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Expiry day trading strategy — how to trade on Thursday, theta decay, option strategies, and the rules for making a profit.
Published by The Retail Trader · AUG 05, 2026 · Features
Expiry day trading strategy — how to trade on Thursday, theta decay, option strategies, and the rules for making a profit.
On the NSE, index options expire on Tuesday (Nifty weekly) and monthly contracts, including stock options, on the last Tuesday. On expiry day:
• Weekly options expire (value = 0 if OTM)
• The last Tuesday of the month = monthly expiry
• Premium falls fastest (theta decay peaks)
Expiry day = high volatility + high opportunity + high risk.
Theta Decay on Expiry Day:
• Option premium = Intrinsic Value + Time Value
• On expiry day, Time Value becomes 0
• OTM options: Premium starts at ₹X, goes to ₹0
• ATM options: Premium drops fast but retains intrinsic value
Key Timings on Expiry Day:
• 9:15-9:45 — What Happens: High volatility, premium still has value, Strategy: Buy options (if direction clear)
• 9:45-11:30 — What Happens: Momentum settles, trends form, Strategy: Best window for option buying
• 11:30-1:30 — What Happens: Theta accelerates, choppy, Strategy: Avoid buying options
• 1:30-2:30 — What Happens: European markets open, movement, Strategy: Last window for directional trades
• 2:30-3:30 — What Happens: Theta = near zero, expiry settlement, Strategy: Option sellers collect, buyers lose
Strategy 1: Morning Momentum (Best for Beginners):
• Check overnight news/global cues
• 9:15-9:30: Observe (DON'T TRADE)
• 9:30-9:45: Identify direction (Nifty above/below previous close)
• 9:45: Buy ATM CE (bullish) or ATM PE (bearish)
• Hold till 11:30
• Exit by 11:30 (don't hold till afternoon)
Why exit by 11:30? In the afternoon, theta decay accelerates. Premium keeps falling even if your direction is right.
Strategy 2: Expiry Day Range Trade:
• Mark previous day high and low
• If price breaks previous high → Buy CE
• If price breaks previous low → Buy PE
• SL: Opposite side of range
• Target: 50-100 points (Nifty)
Strategy 3: Option Selling (Advanced Only):
• Sell OTM Call + Sell OTM Put (Iron Condor/Strangle)
• Collect the premium
• If Nifty stays in range → both options expire worthless → full premium profit
• Risk: Unlimited if breakout happens. Only for experienced.
Rule 1: Exit by 1:00 PM (Beginners):
• Post 1 PM theta = brutal
• Premium can go to zero in 30 min
• Don't hope for recovery
Rule 2: Max 1-2 Trades:
• Expiry day = emotion day
• 1 trade, done. 2 max. No more.
• Revenge trading on expiry = capital destruction
Rule 3: ATM Options Only:
• OTM expiry day = 95% chance zero
• ITM = expensive, less movement
• ATM = best balance of cost and movement
Rule 4: 50% Capital Risk Only:
• Expiry day risk = higher than normal
• Use half your normal position size
• If normal = 1 lot, expiry = half lot (not possible, so trade only 1 lot instead of 2)
Rule 5: No Overnight Carry:
• Expiry day = LAST DAY. Can't carry.
• At 3:30 the broker auto-squares-off (extra charges)
• Exit yourself before 3:20 PM
Weekly Expiry (Every Tuesday):
• Less movement (usually)
• Premium smaller
• Range-bound common
• Strategy: Morning momentum + early exit
Monthly Expiry (Last Tuesday of Month):
• BIG movement expected
• Institutional repositioning
• Higher premiums
• Strategy: Bigger targets, wider SL
• Monthly expiry = trend day often
Keep these six points in mind:
• Buying OTM options on expiry — 95% chance of total loss
• Buying options in the afternoon — theta = zero
• Trading without an SL — premium can go to zero on expiry
• Multiple trades — emotion + theta = loss machine
• Treating expiry like a normal day — expiry day is different, with different rules
• Trying to carry positions — auto square-off at 3:30 + charges
For beginners: AVOID. Once you have experience: try the morning momentum strategy with a small lot.
Option selling = UNLIMITED RISK. Beginners NEVER. Experienced: iron condor with hedging.
Monthly expiry = last Tuesday, bigger movement, institutional activity. Weekly = every Tuesday, range-bound often.
theretailtrader.org/index-details/NSEI → Options tab. Expiry dates and strike prices are available.
ATM option with 100-point Nifty move = 50-100% premium gain possible. But 100-point move is not guaranteed.
Check option chain on TRT: theretailtrader.org/index-details/NSEI Pro (intraday + alerts): theretailtrader.org/pricing — ₹2,499/mo Telegram (expiry day alerts): @theretailtrader_in
Educational only. NOT investment advice. Expiry day trading is high-risk.
This article is for educational purposes only — it is not a buy or sell recommendation, makes no claim of guaranteed returns, and is not advisory. Rules, rates and mechanics are changed from time to time by the exchanges, SEBI and the RBI, so verify every number yourself with your broker or the official source.