SEBI has implemented significant changes to F&O trading rules between 2023 and 2026, transforming the landscape for Nifty traders. The October 2024 circular alone — introducing single weekly expiry per exchange, increased lot sizes, removal of calendar spreads margin benefit, and higher margin requirements — reduced weekly options trading volumes by over 60%. Understanding these rules is not just regulatory compliance; it directly impacts which strategies remain viable and which are no longer profitable.
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Free Strategy PDFKey SEBI F&O Rule Changes (2024-2026)
| Rule Change | Effective Date | Impact on Nifty Trading |
|---|---|---|
| Single weekly expiry per exchange | Nov 2024 | Only one index weekly expiry per exchange (Nifty on NSE Thursday, Sensex on BSE Friday) |
| Increased Nifty lot size | Nov 2024 | Nifty lot size from 25 to 75 units (may vary — SEBI sets minimum contract value) |
| Upfront premium collection | Feb 2025 | Option buyers must pay full premium upfront; no leverage on buying |
| Removal of calendar spread margin benefit | Nov 2024 | No reduced margin for calendar spreads; full margin on each leg |
| ELM (Extreme Loss Margin) increase | Nov 2024 | Additional 2% margin on short options on expiry day |
| Intraday monitoring of position limits | Apr 2025 | Position limits checked 4 times during the day, not just EOD |
| Mandatory disclosure of algo strategies | Jan 2025 | All automated strategies must be registered with exchange |
Single Weekly Expiry — What Changed
Before November 2024, NSE had 5 weekly expiries (Nifty, Bank Nifty, Fin Nifty, Midcap, Sensex on NSE). After the change:
- NSE: Only Nifty weekly expiry (Thursday). Bank Nifty monthly expiry continues.
- BSE: Only Sensex weekly expiry (Friday). Bankex monthly expiry continues.
- Impact: Traders who relied on multiple expiry days for daily income (e.g., Monday Bank Nifty, Tuesday Midcap, Thursday Nifty) now have only Thursday (NSE) and Friday (BSE).
- Adaptation: Focus on Nifty Thursday expiry for weekly income strategies. Use monthly options for non-expiry day strategies.
Lot Size and Contract Value Changes
SEBI mandated that F&O contracts have a minimum value of Rs 15-20 lakh (increased from Rs 5-10 lakh):
| Index | Old Lot Size | New Lot Size (2026) | Contract Value (at current level) | Margin Required |
|---|---|---|---|---|
| Nifty 50 | 25 | 75* | ~Rs 17.25 lakh | ~Rs 1.5-2.0 lakh |
| Bank Nifty | 15 | 30* | ~Rs 15.0 lakh | ~Rs 1.8-2.2 lakh |
| Fin Nifty | 25 | 65* | ~Rs 15.5 lakh | ~Rs 1.5-1.8 lakh |
*Note: Lot sizes are periodically revised by exchanges based on SEBI guidelines. Check current lot sizes on NSE website before trading.
The increased lot size means higher capital requirements. A single Nifty lot now requires Rs 1.5-2.0 lakh in margin, effectively pushing out small traders (below Rs 3-5 lakh capital) from F&O participation.
Margin Rule Changes
Peak Margin (SEBI 2021 onwards)
- Margin must be maintained at all times during the trading day, not just at end of day.
- NSE checks margin 4 times daily: 11:00 AM, 12:30 PM, 2:00 PM, and at close.
- If margin falls below requirement at any snapshot, a penalty of 0.5-1% of shortfall per day is imposed.
Extreme Loss Margin (ELM) on Expiry Day
- On expiry day (Thursday for Nifty), an additional 2% ELM is charged on short option positions.
- This increases margin by Rs 20,000-30,000 per lot on expiry day.
- Impact: makes expiry-day straddle selling more capital-intensive. Small accounts can no longer sell straddles on expiry day.
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Impact on Popular Nifty Strategies
| Strategy | Before SEBI Changes | After SEBI Changes | Viability |
|---|---|---|---|
| Weekly straddle sell (non-Nifty) | Sell straddle on Bank Nifty, Fin Nifty weekly | Only Nifty Thursday left on NSE | Reduced — fewer opportunities per week |
| 0DTE (zero days to expiry) scalping | Extremely popular, high volume | Higher lot size + ELM makes it capital-intensive | Still viable but needs Rs 5L+ capital |
| Calendar spreads | Margin benefit of 50-70% | No margin benefit — full margin both legs | Significantly less attractive |
| Expiry day iron condor | Rs 50,000-80,000 margin | Rs 1,00,000-1,50,000 margin (with ELM) | Needs larger account |
| Monthly option selling | Unaffected | Unaffected (rules mainly target weekly expiry) | Fully viable |
| Positional options (7-30 day) | Unaffected | Unaffected | Fully viable |
How to Adapt Your Trading
- Increase capital: The minimum practical capital for Nifty F&O is now Rs 5-7 lakh (up from Rs 2-3 lakh). Below this, the margin requirements and lot sizes make risk management difficult.
- Shift to monthly options: Monthly options are less affected by rule changes. The margin requirements are standard, and time decay works over a longer period.
- Use spreads instead of naked selling: Credit spreads (bull put, bear call) require lower margin than naked short options and are compliant with all current rules.
- Trade fewer, higher-conviction setups: With higher costs per trade (larger lot × same brokerage), each trade needs a higher edge to be profitable.
- Consider Sensex on BSE: BSE Sensex weekly expiry is on Friday. If you are used to multiple expiry days, adding BSE Sensex gives you Thursday (Nifty) + Friday (Sensex) weekly opportunities.
SEBI's Reasoning
SEBI implemented these changes after finding that:
- 93% of individual F&O traders lost money over FY22-24 (SEBI study).
- Average loss per trader was Rs 2 lakh over 3 years.
- Weekly options and small lot sizes encouraged excessive speculation by under-capitalized traders.
- The regulatory intent is to make F&O a serious market for hedging and informed trading, not a casino for retail speculation.
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Free Strategy PDFConclusion
SEBI's 2024-2026 F&O rule changes have fundamentally altered the Nifty trading landscape. Single weekly expiry, larger lot sizes, higher margins, and ELM on expiry day mean that Nifty F&O trading now requires more capital, better risk management, and more selective trade entry. The days of trading Rs 50,000 accounts with weekly straddles on 5 different indices are over. Adapt by increasing your capital, shifting to monthly strategies and credit spreads, and focusing on quality over quantity. The traders who survive this regulatory shift will face less competition and potentially better opportunities.
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Free Strategy PDFFrequently Asked Questions
What is the current Nifty lot size in 2026?
SEBI mandated minimum contract values of Rs 15-20 lakh. The Nifty lot size has been adjusted accordingly (currently around 75 units, though this changes periodically). Check the NSE website for the current lot size as it is revised every few months based on price levels.
Can I still do weekly options trading in 2026?
Yes, but only on one index per exchange. NSE has Nifty weekly expiry (Thursday) and BSE has Sensex weekly expiry (Friday). Bank Nifty, Fin Nifty, and other indices no longer have weekly expiries — only monthly.
How much capital do I need for Nifty F&O in 2026?
Minimum practical capital is Rs 5-7 lakh. A single Nifty lot requires Rs 1.5-2.0 lakh in margin, and risk management requires at least 3x the margin for a single position. Below Rs 5 lakh, the risk per trade becomes too high relative to account size.
What is the extra margin on expiry day?
SEBI requires an additional 2% Extreme Loss Margin (ELM) on short option positions on expiry day. For Nifty, this adds Rs 20,000-30,000 per lot to the margin requirement. This makes expiry-day straddle/strangle selling significantly more capital-intensive.