If you’ve traded in Futures & Options anytime in the last two years, you’ve probably noticed things feel different — bigger lot sizes, fewer expiry days, higher margins, and if you use any kind of automated trading tool, a lot more paperwork and setup than before.
That’s not a coincidence. Since late 2023, SEBI (the Securities and Exchange Board of India) has been steadily rewriting the rules for how retail traders can access derivatives and algorithmic trading — and April 2026 marks the point where nearly all of it becomes fully mandatory.
The reason is sobering: SEBI’s own research found that over 90% of individual F&O traders lose money, with aggregate retail losses running into lakhs of crores of rupees.
These reforms are the regulator’s direct response to that data. In this guide, we’ll walk through exactly what’s changed, why it changed, and — most importantly — what it means for how you trade from here.
Disclaimer: This article is for general educational purposes and reflects publicly available SEBI circulars and exchange notifications as understood at the time of writing. Regulations and compliance dates can be revised — always verify the latest requirements with your broker or on the official SEBI/NSE/BSE websites before making trading decisions.
Why SEBI Overhauled F&O and Algo Trading Rules
To understand why these rules exist, it helps to understand the problem SEBI was trying to solve.
A SEBI study found that the vast majority of individual F&O traders were losing money consistently over multi-year periods, with total retail losses running into well over a lakh crore rupees.
The pattern was clear: frequent weekly expiries encouraged short-term, high-frequency speculation; small contract sizes let undercapitalised traders take positions far beyond what their account could safely support; and a growing wave of unregulated “black box” algo strategies — sold with no transparency or accountability — added another layer of risk with no recourse for traders when things went wrong.
The regulatory response has unfolded in two connected tracks:
Structural reforms to F&O trading itself — lot sizes, expiries, and margin rules — aimed at reducing undercapitalised, high-frequency speculation.
A new framework for algorithmic and API-based trading — aimed at making every automated order traceable, accountable, and secure.
Both tracks share the same underlying goal: making sure retail participants trade with adequate capital, real transparency, and proper safeguards — rather than getting drawn into high-risk, high-frequency activity they may not fully understand.
Timeline: How These Rules Rolled Out (2024–2026)
These changes didn’t happen overnight — SEBI phased them in deliberately to give brokers and traders time to adjust.
| Date | Change Introduced | Category |
| November 20, 2024 | Minimum contract value raised to Rs 15-20 lakh; lot sizes increased; one weekly expiry allowed per exchange; additional 2% ELM on short index options on expiry day | F&O Structural Reform |
| February 1, 2025 | Options premium collection made mandatory upfront from buyers; calendar spread margin benefit removed on expiry day | F&O Margin Reform |
| April 1, 2025 | Intraday position limits monitored via multiple random snapshots through the day, not just end-of-day | F&O Position Monitoring |
| August 2025 | Rollout of SEBI’s retail algo trading framework begins | Algo Trading Framework |
| October 2025 | Brokers begin registering retail algo products with exchanges | Algo Trading Framework |
| January 5, 2026 | Non-compliant brokers barred from onboarding new retail API/algo clients | Algo Trading Framework |
| April 1, 2026 | Full algo trading framework mandatory for all brokers & existing users; STT hike on F&O; 50:50 cash margin rule applies | Algo Trading + F&O + Tax |
If you’ve felt like the rules keep shifting under your feet over the last two years, this table is why — it’s been a steady, multi-phase overhaul rather than one single change.
Bigger Lot Sizes & Higher Contract Value
One of the earliest and most noticeable changes was to contract size.
Previously, index derivative contracts (Nifty, Bank Nifty, and others) had a minimum contract value in the range of roughly Rs 5–10 lakh.
Under the new rules, this was raised to Rs 15–20 lakh, meaning lot sizes across major indices went up substantially, with further fine-tuning through late 2025 and early 2026 as index levels moved.
| Aspect | Before Reform | After Reform (2025-26) |
| Minimum index contract value | Approx. Rs 5-10 lakh | Approx. Rs 15-20 lakh |
| Retail account access | Smaller accounts could trade multiple lots | Accounts under approx. Rs 1 lakh largely priced out of index derivatives at new lot sizes |
| Nifty lot size (illustrative) | Smaller lot (pre-reform) | Revised upward; further tweaked through Dec 2025-Jan 2026 (approx. 65) |
| Bank Nifty lot size (illustrative) | Smaller lot (pre-reform) | Revised upward; further tweaked through Dec 2025-Jan 2026 (approx. 30) |
What this means for you: if your account size is modest, you’ll need significantly more capital to take even a single lot position than you did a couple of years ago.
This is a deliberate design choice by SEBI, not a temporary market condition.
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One Weekly Expiry Per Exchange — What Happened to Bank Nifty Weeklies
For years, Indian retail traders had access to weekly expiries across multiple indices, which meant there was almost always an expiry-day trade available somewhere in the market — a dynamic SEBI identified as encouraging repetitive, gambling-like speculation rather than genuine hedging or investing.
Under the new rules, each exchange can now offer only one weekly expiry contract:
- NSE: Only Nifty 50 retains a weekly expiry. Bank Nifty, Nifty Financial Services (FinNifty), Nifty Midcap Select, and Nifty Next 50 weekly options have all been discontinued — these indices now only have monthly expiries.
- BSE: Only Sensex retains a weekly expiry.
This was one of the most disruptive changes for active options traders, particularly the large community that traded Bank Nifty weeklies.
If that was your primary strategy, you now need to either shift to Nifty weekly options, move to Bank Nifty’s monthly contracts (which behave differently due to slower time decay), or explore individual bank stock options instead.
Margin Changes — Upfront Premium, ELM & the 50:50 Cash Rule
Several margin-related changes work together to reduce leveraged, undercapitalised speculation:
Upfront premium collection: Since February 2025, brokers must collect the full options premium from buyers upfront, rather than allowing deferred payment — closing a loophole that previously let some traders take positions without adequate funds actually in the account.
Additional Extreme Loss Margin (ELM): A further 2% ELM now applies specifically to short index options positions on expiry day, when speculative activity has historically spiked.
Calendar spread margin benefit removed on expiry day: Traders combining near and far-month positions to reduce margin requirements no longer get that benefit specifically on expiry day, which changes the economics of several popular spread strategies.
50:50 cash margin rule: From April 1, 2026, brokers must ensure that at least 50% of the margin maintained for F&O positions is held in cash or cash-equivalent assets, rather than relying heavily on collateral or borrowed exposure.
Together, these changes mean you’ll generally need more actual cash sitting in your trading account than before to hold the same F&O positions you may have held in previous years.
Intraday Position Monitoring — No More End-of-Day Loopholes
Previously, position limits for index derivatives were primarily checked at the end of the trading day.
This created a known workaround: some traders would build large intraday positions, well beyond comfortable position limits, and simply reduce them before the market closed to stay compliant on paper.
Since April 2025, exchanges monitor position limits using multiple random snapshots throughout the trading session, not just at day-end. Market Wide Position Limits (MWPL) are also now calculated more strictly, based on free-float and actual trading volumes, and individual retail traders are capped at holding up to 10% of the MWPL in a single stock.
What this means for you: intraday limit breaches can now be flagged and penalised at any point during the session — reducing your position “before the bell” no longer offers protection if you crossed the line at 11 AM.
SEBI’s New Algo Trading Framework — Algo-ID & Broker Accountability
This is the newest and, for many retail traders, the least understood part of the overhaul.Until recently, algorithmic trading rules in India were built primarily for institutional participants.
Retail traders using third-party algo tools, trading APIs, or their own automated scripts largely operated outside any formal oversight — leading to a rise in unregulated “black box” strategies with no disclosed backtesting, no accountability, and no recourse for traders when a strategy failed.
SEBI’s February 2025 circular changed that with a clear structure:
- Every algorithm must be registered and tagged before it can trade. From April 1, 2026, every order placed by an algorithm — whether it’s a placement, modification, or cancellation — must carry a unique, exchange-assigned Algo-ID, creating a full audit trail from strategy to execution.
- Brokers are now the “Principal,” and algo providers are the “Agent.” This principal-agent structure makes brokers directly accountable for every algorithm running through their platform, including third-party tools their clients connect.
- Any modification to an approved algorithm requires fresh exchange approval before it can go live again — you can’t quietly tweak a registered strategy and keep running it under the old approval.
This came into sharper focus after SEBI barred global trading firm Jane Street in July 2025 over alleged manipulative algorithmic trading practices — a high-profile signal that unmonitored algo activity in Indian markets was no longer going to be tolerated, at either the institutional or retail level.
API Trading Rules — Static IP, OAuth & Cybersecurity Requirements
If you use trading APIs — whether a personal Python script, a third-party algo vendor, or a semi-automated tool — four concrete changes affect you directly:
- Static IP whitelisting: Orders can only be sent through the API from a static IP address that’s been registered with your broker. Connections from any other IP are automatically rejected.
- OAuth-based authentication is now mandatory: Older, less secure authentication methods are no longer permitted for API access.
- Mandatory cybersecurity testing: Brokers running retail algo systems must complete VAPT (Vulnerability Assessment & Penetration Testing) before any platform goes live, and cannot onboard new API clients without meeting these security standards.
- Strategy registration is compulsory: Your algorithm or strategy needs a registered Strategy ID with your broker — it cannot legally place orders on Indian exchanges without one.
Important exception: if you place your own orders manually through your broker’s app or web platform — without using any third-party tool, script, or API — none of this affects you. These rules specifically target automated and API-driven order flow.
STT Hike on F&O — What It Costs You Now
Alongside the structural reforms, the Securities Transaction Tax (STT) on derivatives has also gone up, effective April 1, 2026:
| Instrument | STT Before | STT From April 1, 2026 | Approx. Increase |
| Futures (Equity & Index) | 0.02% | 0.05% | ~150% increase |
| Options (on premium/exercise) | Lower rate (pre-2026) | 0.15% | Significant increase |
This is a meaningful increase — roughly a 150% hike on futures STT — and it directly raises the cost of every trade, independent of your win rate. Combined with larger lot sizes and higher margin requirements, frequent, high-volume F&O trading has become structurally more expensive than it was just two years ago.
You can see how STT and other charges affect your total trading cost on our charges & hidden fees and brokerage calculator pages, and this cost increase is also worth factoring into how you plan for F&O taxation at year-end.
What Retail Traders Should Do Now
If you’re actively trading F&O or using any form of algorithmic/API-based trading, here’s a practical checklist:
- Recalculate your position sizing. Larger lot sizes mean the same strategy now requires more capital meaningfully — don’t assume your old position sizes still apply.
- Check whether your primary strategy still exists. If you traded Bank Nifty weeklies, that contract no longer exists — you’ll need a new approach.
- Talk to your broker about algo/API compliance. If you use any automated tool, confirm your Strategy ID is registered, your IP is whitelisted, and your setup meets the new authentication standards — before you find yourself locked out.
- Keep more cash in your account. With upfront premium collection and the 50:50 cash margin rule, thin, over-leveraged accounts have far less room to operate than before.
- Reassess strategies around single expiries. With fewer expiry days available, spread out, defined-risk strategies (like bull/bear spreads or iron condors) generally fit the new environment better than frequent naked option selling.
- Factor the STT hike into your cost calculations. What used to be a marginally profitable high-frequency strategy may no longer be, once the higher STT is applied.
- If you’re a beginner, don’t rush in. These reforms exist specifically because the overwhelming majority of retail F&O traders historically lost money — take time to understand the new landscape via a stock broker review or algo trading platform review before committing real capital.
Frequently Asked Questions
Do these new rules apply to me if I only trade manually through my broker’s app?
The lot size, expiry, margin, and STT changes apply to everyone trading F&O, regardless of how you place orders. However, the algo-specific rules (Algo-ID, static IP, OAuth) only apply if you use a third-party tool, API, or automated script — not to manual orders placed directly on the broker’s platform.
Is algo trading still legal for retail traders in India?
Yes, algo trading remains fully legal. It’s now regulated rather than restricted — every algorithm simply needs to be registered, tagged with an Algo-ID, and run through SEBI-compliant infrastructure.
What happens if my broker or algo provider isn’t compliant by April 2026?
Brokers that haven’t met the compliance requirements are barred from onboarding new retail API/algo clients, and non-compliant strategies without an Algo-ID cannot legally place orders on Indian exchanges after the deadline.
Why did SEBI remove Bank Nifty’s weekly expiry?
Bank Nifty weekly options had among the highest speculative retail volumes of any Indian derivative contract, with a large share of contracts historically expiring worthless.
SEBI restricted each exchange to one weekly expiry specifically to reduce this pattern of high-frequency, low-probability speculation.
Does the STT hike apply to equity delivery trades too, or only F&O?
The STT hike discussed here specifically applies to futures and options (derivatives). STT on delivery-based equity trades follows a separate, long-standing structure.
I have under Rs 1 lakh in my trading account — can I still trade index F&O?
With the higher minimum contract values now in place, trading a full lot of major index derivatives typically requires meaningfully more capital than before.
Traders with smaller accounts may find it more practical to explore other instruments or build capital before entering index derivatives.
Final Thoughts
SEBI’s overhaul of F&O and algo trading rules isn’t a single event — it’s a multi-year, structural rework of how retail derivatives trading works in India, built directly on data showing that the vast majority of retail F&O traders were losing money under the old rules.
Bigger lot sizes, fewer expiries, tighter margins, a higher STT, and a fully regulated algo framework all point in the same direction: trading with adequate capital, real transparency, and proper risk controls.
Before you place your next F&O trade or connect a new algo strategy, it’s worth revisiting your broker comparison to confirm your broker is fully compliant with the new framework — and sizing your positions for the market as it exists today, not as it did two years ago.