SEBI’s new F&O rules for 2026 are the biggest shake-up of India’s derivatives market in years, arriving in phases through the second half of 2025 and into April 2026. Higher contract sizes, a new algo-trading framework, and a jump in securities transaction tax (STT) all land on retail traders at once. Here’s what actually changed, when, and what it means if you trade futures and options.
Key Takeaways
- Minimum F&O contract value has been raised to roughly ₹15–20 lakh, up sharply from the earlier ₹5–10 lakh band, so each lot now needs meaningfully more capital.
- Weekly expiries are now limited to one benchmark index per exchange – Nifty on NSE and Sensex on BSE – removing the multiple weekly expiry options traders used to have.
- STT on futures rose from 0.02% to 0.05%, and on options premiums from 0.1% to 0.15%, effective April 1, 2026, directly raising the cost of every trade.
- A new algo-trading framework, also effective April 1, 2026, requires unique algo IDs, broker-level accountability, and registration for high-frequency retail API strategies.
- SEBI’s own data shows F&O turnover fell from about ₹490 trillion in 2024 to ₹391 trillion in 2025 as these changes took hold – the rules are already changing trader behaviour.
Why SEBI Tightened F&O Rules
SEBI’s stated reason is investor protection: its own studies have repeatedly shown that a large majority of individual F&O traders lose money, and regulators pointed to excessive leverage, expiry-day volatility, and social-media “trading tips” as key drivers of retail losses. The 2026 rules are designed to raise the bar for entry, reduce speculative volume around expiries, and bring algorithmic and API-based trading under closer supervision.
What Changed: A Quick Reference
| Change | What It Means | Effective |
|---|---|---|
| Higher contract/lot size | Minimum contract value raised to about ₹15–20 lakh; Nifty lot size adjusted to 65 units | Dec 31, 2025 |
| Fewer weekly expiries | Only one weekly-expiry index per exchange (Nifty on NSE, Sensex on BSE) | Phased through 2025 |
| Stricter position limits | Delta-based Future Equivalent Open Interest and tighter Market-Wide Position Limits, monitored intraday | Phased through 2025 |
| Upfront premium + Extreme Loss Margin | Full option premium collected upfront; extra 2% margin on short options near expiry | Phased through 2025 |
| STT increase | Futures STT 0.02% → 0.05%; options premium STT 0.1% → 0.15% | April 1, 2026 |
| Algo trading framework | Unique algo IDs, broker accountability, registration above 10 orders/second | April 1, 2026 |
Bigger Contracts, More Capital Needed
The most immediate change for retail traders is contract size. Exchanges have raised minimum contract values into the ₹15–20 lakh range, roughly double the earlier norm, and adjusted lot sizes accordingly (Nifty’s lot size now sits at 65 units). In practice, this means the same directional view now needs significantly more margin to express through F&O – a trader who could take a Nifty options position with a modest account a year ago may no longer have enough capital to do so at the new lot size.
Fewer Weekly Expiries
NSE has kept a weekly expiry only for Nifty, and BSE only for Sensex; other index weekly expiries have been phased out. This removes a lot of the day-to-day expiry-driven trading that built up around multiple weekly contracts, and concentrates that activity (and its volatility) into fewer, more predictable expiry days.
Position Limits Are Now Tighter and Watched in Real Time
SEBI has moved to a delta-based Future Equivalent Open Interest method for measuring exposure, and tied Market-Wide Position Limits more closely to a stock’s free float and delivery volumes. Retail accounts are capped at a smaller share of these limits than institutional accounts, and exchanges now monitor positions intraday rather than only at end of day.
Margins: Full Premium Upfront, Plus an Expiry-Day Buffer
Brokers must now collect the full option premium upfront before an order executes, closing the gap that let some traders take positions larger than their effective margin. Near expiry, an additional 2% Extreme Loss Margin applies to short options positions, specifically to cushion the sharp swings that expiry days can produce.
Transaction Costs Are Up Across the Board
From April 1, 2026, STT on futures trades rose from 0.02% to 0.05% – a 150% increase – while STT on options premiums rose from 0.1% to 0.15%, and the STT on exercised options rose from 0.125% to 0.15%. These are charged on every trade regardless of whether it’s profitable, so frequent traders and scalpers feel the increase the most. (Use our F&O Turnover & Tax Audit Calculator to see how your turnover and tax-audit exposure look under the current rules.)
The New Algo Trading Framework
Also effective April 1, 2026, SEBI’s expanded algo-trading rules bring retail API and algo strategies under formal oversight for the first time:
- Broker accountability – brokers are now responsible for every algo order placed through their platform; algo providers act only as agents and can’t connect directly to exchanges.
- Unique algo IDs – every algorithm-generated order carries an exchange-issued identifier for full traceability.
- API security rules – static IPs, OAuth authentication, two-factor authentication per session, and mandatory daily session resets.
- White box vs. black box – transparent, replicable strategies need standard exchange registration; opaque (“black box”) strategies require SEBI Research Analyst registration and a documented research report.
- The 10 orders/second threshold – traders below this rate per exchange need no special registration; crossing it requires exchange approval.
If you trade manually through a broker’s web or mobile app, none of this changes your experience. If you use an API, a trading bot, or a third-party algo platform, check that your provider is empanelled and compliant before April 1, 2026.
What This Means for Retail F&O Traders
- Budget more capital per lot. The higher contract sizes mean fewer, more deliberate positions rather than spreading a small account thin across many lots.
- Expect higher costs per trade. Factor the new STT rates into your break-even calculations, especially for high-frequency or scalping strategies.
- Plan around fewer weekly expiries. Strategies built around multiple index weekly expiries need to be rethought around the Nifty/Sensex-only weekly calendar.
- Check your broker’s algo compliance if you use any automated or API-based strategy, well before the April 1, 2026 deadline.
None of this changes the fundamentals covered in our Options Trading for Beginners guide or Trading Strategies for Beginners – it just raises the capital and compliance bar for putting those strategies to work in the F&O segment.
This article is for educational purposes and reflects publicly reported regulatory changes as of September 2026. Rules and effective dates can be revised by SEBI and the exchanges; always confirm current margin, lot size, and compliance requirements with your broker before trading.
Frequently Asked Questions
When do SEBI’s new F&O rules take effect?
The changes have rolled out in phases: contract size, lot size, position limit, and margin changes were phased in through late 2025, while the STT increase and the new algo-trading framework both take effect April 1, 2026.
Do these rules affect intraday equity trading too?
The contract-size, expiry, and margin changes are specific to the F&O segment. The new algo-trading framework, however, applies to any algorithmic or API-based order, including in equity intraday trading.
Why did SEBI increase F&O contract sizes?
SEBI’s own studies have repeatedly shown that most individual F&O traders lose money. Raising contract sizes and margin requirements is meant to raise the capital and risk-awareness bar for retail participation in derivatives.
Will there be more changes to F&O rules after 2026?
SEBI has signalled it will keep reviewing the derivatives segment, so further adjustments to lot sizes, margins, or expiry structures are possible. Check SEBI’s and your exchange’s official circulars for the latest updates.
Where can I check the exact current lot sizes and margins?
Directly on the NSE or BSE website, or through your broker’s margin calculator – exchanges revise these figures periodically, so always confirm the current numbers before placing a trade.
