Monthly Expiry
Monthly expiry options are index and stock contracts that expire once a month, carrying more time value and slower decay than weeklies — suited to positional trades, hedging and strategies that need room to play out.
Quick Answer
Monthly expiry options expire once a month and carry more time value, so they decay slowly until their final week. That suits positional views, hedging and multi-leg strategies that need room to play out. A monthly Nifty option gives a directional trade weeks to work, unlike a weekly that expires in days.
Monthly Expiry — key takeaways
Monthly expiry options offer more time value, slower decay and higher Vega than weeklies — ideal for positional trades, hedges and complex strategies. You pay more premium for room to be right over weeks and lower day-to-day Gamma risk.
Monthly Expiry at a glance
| Life | Up to a month |
|---|---|
| Decay | Slow until final week |
| Stock options | Monthly only |
Monthly Expiry in simple words
Monthly options expire in the last week of each month. They cost more than weeklies because they have more time value, but they decay slowly until their final week. This makes them better for positional views, hedging a portfolio, and multi-leg strategies that need time. Stock options in India are monthly, while indices have both weekly and monthly contracts.
How Monthly Expiry behaves — visual
Monthly Expiry — detailed explanation
What monthly expiry means
A monthly option settles on the monthly expiry, which the NSE schedules on the last Tuesday of each month (moved from the last Thursday for contracts expiring on or after 1 September 2025, per NSE circular NSE/FAOP/68747 dated 25 June 2025; the exact day is set by the exchange and revised periodically — check the current calendar). Indian stock (single-stock) options are monthly, and indices like Nifty and Bank Nifty have monthly contracts alongside their weeklies. With weeks of life, monthly options carry substantial time value and meaningful Vega, so implied volatility matters far more than it does for weeklies.
Slower, more forgiving decay
A monthly option spends most of its life in the gentle part of the time-decay curve, losing value slowly until the final week, when decay accelerates. This makes monthlies more forgiving for buyers — a thesis has room to develop without the premium evaporating in days. Positional traders and hedgers favour monthlies precisely because they are not racing an immediate clock, accepting a higher premium in exchange for time and stability.
More Vega, more volatility exposure
Because they have more time until expiry, monthly options carry significantly more Vega than weeklies. This means their value is more sensitive to changes in implied volatility — a rise in India VIX inflates monthly premiums more, and a fall deflates them more. Traders must therefore weigh the volatility environment when buying or selling monthlies, whereas weeklies are relatively insulated from Vega.
When to choose monthlies
Monthly options suit multi-week directional views, portfolio hedges that must last, and complex strategies (calendars, longer-dated spreads) that need time to work. They are also the natural choice for stock options. The trade-off is cost and slower gratification: you pay more premium and decay works more gently, in exchange for room to be right over a longer horizon and lower Gamma risk day to day.
Monthly vs weekly expiry
| Monthly | Weekly | |
|---|---|---|
| Life | Up to a month | A few days |
| Premium | Higher | Lower |
| Decay | Slow until final week | Fast throughout |
| Vega risk | Higher | Lower |
| Best for | Positional / hedging | Short-term / expiry |
Monthly Expiry — practical example (Nifty)
Illustrative — Nifty, lot size 65
You expect Nifty to trend up over the next three weeks and buy a monthly 20,000 CE for ₹350 with Nifty at 20,000. Over the first two weeks, even if Nifty moves sideways, Theta is gentle and the option holds much of its value — unlike a weekly, which would have expired. If Nifty climbs to 20,600 by the final week, the call is deep in profit. The higher upfront premium bought you time and slower decay for a positional view.
Why Monthly Expiry matters in practice
- Monthly options carry more time value and decay slowly until the final week.
- They suit positional views, portfolio hedges and multi-leg strategies needing time.
- Higher Vega means implied volatility matters more than for weeklies.
- Indian stock options are monthly; indices offer both monthly and weekly.
Common mistakes with Monthly Expiry
- Overpaying for monthly premium when a shorter-dated option would suffice for a quick view.
- Ignoring the higher Vega and getting hurt when implied volatility falls after buying.
- Assuming slow early decay lasts — the final week's Theta still accelerates.
- Holding in-the-money monthly stock options into expiry and facing physical settlement.
How professionals use Monthly Expiry
Skilled traders match expiry to horizon: they use monthlies for multi-week theses and hedges, appreciating the gentler decay and room to be right, while weighing the higher Vega against the volatility outlook. They roll positional monthlies before the final-week decay and settlement pressures bite, and they always close in-the-money monthly stock options before physical delivery is triggered.
Monthly Expiry — frequently asked questions
What is monthly expiry in options?
Monthly expiry options expire in the last week of each month. They carry more time value and decay more slowly than weekly options, making them suited to positional trades, hedging and complex strategies.
What is the difference between monthly and weekly options?
Monthly options have more time to expiry, higher premiums, slower decay and more Vega; weekly options are cheaper, decay fast and have low Vega. Monthlies suit longer views; weeklies suit short-term trades.
Are stock options weekly or monthly in India?
Indian single-stock options are monthly. Weekly index options are offered on the NSE's Nifty and the BSE's Sensex; Bank Nifty weekly options were discontinued in November 2024, so Bank Nifty now trades monthly only. Always check the exchange's current product list.
When do monthly options decay fastest?
In their final week. For most of their life, monthly options decay slowly, but Theta accelerates sharply as expiry approaches, just like any option.
Do monthly options have more volatility risk?
Yes. With more time to expiry, monthlies carry higher Vega, so their value is more sensitive to changes in implied volatility than short-dated weeklies.
Are monthly options better for beginners?
Often yes. Their slower decay and lower day-to-day Gamma are more forgiving than weeklies, giving a thesis room to develop without the premium evaporating in days.
When is monthly expiry in India?
The NSE schedules monthly expiry on the last Tuesday of the month (moved from the last Thursday for contracts expiring on or after 1 September 2025, per NSE/FAOP/68747). The exact day is set by the exchange and revised periodically, so check the current NSE calendar.
Should I roll a monthly option before expiry?
Positional traders often roll to the next month before the final-week decay and settlement pressures bite, and before physical settlement is triggered on in-the-money stock options.
Sources & references
Published 1 July 2026 · Updated 18 July 2026. Educational content only — not investment advice.