Regulation SEBI F&O futures options weekly expiry lot size retail derivatives index options

SEBI F&O entry barrier rules (October 2024 framework)

From WebNotes, a public knowledge base. Last updated 18 May 2026. Reading time ~12 min.

The SEBI F&O entry barrier rules announced on 1 October 2024 are the most consequential tightening of retail access to Indian derivatives in a decade. The framework, set out in a SEBI circular dated 1 October 2024 and operationalised through subsequent exchange-level implementation circulars, comprises six measures that collectively raise the minimum capital required to participate in index futures and options, reduce the volume of weekly expiry contracts, and tighten intra-day risk parameters around expiry. The framework was a direct policy response to a SEBI study published in September 2024 that found 93 per cent of retail individual traders in equity F&O lost money over the three financial years FY22 to FY24, with aggregate net losses of approximately Rs 1.81 lakh crore.

For Zerodha and other Indian retail brokers, the 1 October 2024 framework triggered the most significant operational and product changes since the September 2020 margin reforms. Lot sizes were revised across both NSE and BSE index contracts, weekly expiry calendars were consolidated, premium-collection workflows were restructured, and risk systems were rebuilt to handle intra-day position-limit monitoring. For retail traders, the framework meaningfully raised the minimum capital threshold for index options trading and reduced the variety of short-dated weekly contracts available.

This article covers the underlying SEBI study and its findings, the six structural measures in the framework, the phased implementation timeline from November 2024 onwards, the interaction with the parallel STT hike on F&O effective from 1 October 2024, and the operational consequences for retail traders, brokers, and exchanges.

The underlying SEBI study

What the study examined

In September 2024, SEBI published a follow-up to its January 2023 study on retail F&O participation. The 2024 study examined approximately 96 lakh unique individual and proprietary trader accounts across NSE equity derivatives over the three financial years FY22, FY23, and FY24. The study segmented results by trader category, contract type, and trade frequency to identify the structural drivers of retail derivatives losses.

Key findings

The 2024 study’s headline findings became the policy justification for the October 2024 framework:

93 per cent of retail individual traders made net losses in equity F&O over FY22-FY24. Earlier January 2023 study had estimated 89 per cent for FY22; the 2024 update showed deterioration despite the parallel 2020-2021 margin reforms.
Aggregate net losses of Rs 1.81 lakh crore by retail individual traders over the three-year period.
Average net loss per loss-making trader of approximately Rs 2 lakh annually.
Trading costs absorbed an additional Rs 26,000 crore over the period in brokerage, exchange fees, STT, and clearing charges, separate from the trading losses.
75 per cent of retail trader concentration on weekly index options with average holding period under a single trading session, indicating that the activity was dominated by ultra-short-horizon directional speculation rather than hedging.

The study also documented that despite the reforms of 2020-2021 (peak margin, margin pledge ), retail F&O activity had grown sharply, suggesting that the operational tightening had not affected the underlying behavioural drivers.

The six measures

Measure 1: Increased contract size

The framework raised the minimum notional contract size on index derivatives from the previous Rs 5-10 lakh range to a new Rs 15-20 lakh band. The change applied through lot-size revisions on each index contract, with the specific new lot sizes determined by the exchange based on the prevailing index level so that each contract’s notional value sat within the new band.

For Nifty 50 options, the lot size was revised from 25 to 75 effective from contracts expiring after the cutover date in November 2024. For Bank Nifty , the revision moved the lot from 15 to 30. The Sensex and Bankex contracts on BSE saw parallel revisions.

The contract-size measure raised the minimum capital required to participate. Under the previous Rs 5-10 lakh notional, a retail trader could write a SPAN margin of approximately Rs 1 lakh on a typical short option position. Under the new Rs 15-20 lakh notional, the same position requires approximately Rs 3 lakh of SPAN margin, raising the entry threshold materially.

Measure 2: Rationalisation of weekly options

Each exchange was permitted to offer weekly options on only one of its benchmark index contracts, with weekly contracts on other indices to be discontinued. The framework operationalised this constraint as a per-exchange one-weekly limit.

For NSE, Nifty 50 retained weekly expiries while Bank Nifty , Nifty Financial Services, Nifty Midcap Select, and Nifty Next 50 weekly contracts were discontinued from late November 2024. For BSE, Sensex retained weekly expiries while Bankex weekly contracts were discontinued.

The measure significantly reduced the variety of short-dated weekly contracts available. Before the change, an Indian retail trader had access to five distinct weekly expiries across NSE and BSE indices in any given week; after the change, only Nifty 50 and Sensex weeklies remained. The weekly expiry contraction article covers the mechanics and trader response in detail.

Measure 3: Upfront collection of option premiums from buyers

Effective from 1 February 2025, brokers were required to collect the full option premium upfront from option buyers before submitting the order to the exchange. Before this rule, brokers had operated end-of-day netting on premiums with intraday leverage, allowing a retail trader to buy options worth more than the available cash balance and settle the net during the day’s end.

The upfront collection rule eliminated this intraday premium leverage. For an option buyer paying Rs 100 premium per lot, the broker must now have Rs 100 per lot collected in the client account before order submission, with no end-of-day grace.

The change reduced retail intraday option-buying volumes because the operational ability to take large speculative directional bets with limited capital was removed. For retail traders who relied on intraday premium leverage to size short-dated lottery-ticket positions on expiry days, the new rule meaningfully tightened the per-trade capital requirement.

Measure 4: Removal of expiry-day calendar spread benefit

The framework removed the calendar-spread margin benefit on expiry day for option positions. Under the prior framework, a trader holding offsetting option positions across different expiries received a margin offset reflecting the partial hedge. On the expiry day of the near-leg contract, this offset was no longer treated as a hedge because the near-leg position effectively unwound at expiry.

Effective from 1 February 2025, the calendar-spread offset was removed on the expiry day for the near-leg contract, with full margin reverting to the gross requirement on the far-leg position. The change discouraged expiry-day calendar trading by raising the margin requirement on the surviving leg.

Measure 5: Intra-day position-limit monitoring

The framework introduced intra-day monitoring of position limits on index options. Before the change, position limits were monitored at end-of-day, allowing a trader to exceed the position limit intra-day so long as the position was reduced by end-of-day. Effective from 1 April 2025, exchanges began monitoring position limits intra-day with breaches subject to immediate squaring-off by the broker.

The change raised the operational requirement on retail trading platforms to enforce real-time position-limit checks at the order-placement layer rather than relying on end-of-day reconciliation.

Measure 6: Increased tail risk coverage on expiry day

The framework added an additional 2 per cent Extreme Loss Margin (ELM) on short option positions on the expiry day. The increase was specifically targeted at the expiry-day pin-risk that arises when an option strike sits close to the underlying spot near settlement, and was operative from 20 November 2024.

For an option writer holding a position with original margin of Rs 1 lakh, the additional 2 per cent ELM on expiry day adds approximately Rs 2,000 per lot of expiry-day margin, reflecting the higher operational risk of a strike that may settle in-the-money by a small amount.

See Extreme Loss Margin for the underlying ELM framework that this expiry-day addition modifies.

Implementation timeline

The six measures were implemented in a phased sequence from November 2024 through April 2025:

20 November 2024: weekly expiry contraction operative; lot-size revision effective for new contracts; additional 2 per cent ELM on expiry-day short positions begins.
1 February 2025: upfront option premium collection from buyers operative; expiry-day calendar-spread offset removed.
1 April 2025: intra-day position-limit monitoring operative.

The staggered timeline allowed brokers and exchanges to roll out the operational and risk-system changes sequentially rather than as a single big-bang cutover. By April 2025, all six measures were fully operative across NSE and BSE index derivatives.

Interaction with parallel reforms

The October 2024 framework operated alongside several parallel reforms that together intensified the retail derivatives tightening:

STT hike: the STT hike on F&O effective from 1 October 2024 raised the securities transaction tax on options selling from 0.0625 per cent to 0.1 per cent and on futures selling from 0.0125 per cent to 0.02 per cent. The change raised the per-trade fixed-cost component of every F&O transaction.
True-to-label charges: the SEBI true-to-label charges framework, also effective from 1 October 2024, required exchanges to pass through transaction charges to brokers at the same rate that brokers passed to clients, ending the volume-rebate model on retail F&O.
Peak margin and pledge regime: the parallel peak margin penalty regime and margin pledge framework continued unchanged, providing the operational baseline on top of which the October 2024 measures applied.

The combined effect of the four parallel changes (entry-barrier framework, STT hike, true-to-label charges, and the existing peak margin regime) was a structural increase in the all-in cost of retail F&O trading in late 2024.

Operational consequences

Higher minimum capital threshold

The contract-size measure alone raised the effective minimum capital for index options trading. A retail trader who could previously participate with Rs 1-2 lakh of cash margin now requires approximately Rs 3-5 lakh to take an equivalent position size. The threshold change excluded a portion of the very small retail accounts that had been the majority of new F&O participants in 2022-2024.

Reduced weekly expiry volume

NSE volumes on weekly Bank Nifty, Nifty Financial Services, and Nifty Next 50 options dropped sharply after November 2024 as those contracts were withdrawn. Some of the displaced volume migrated to the surviving Nifty 50 weeklies, but overall weekly options turnover fell materially in the months following the cutover. See weekly expiry contraction November 2024 for the volume migration analysis.

Broker product and disclosure adjustments

Zerodha and other major brokers added pre-trade disclosure pop-ups warning users about retail F&O loss statistics, citing the SEBI 93 per cent finding. The disclosures were a SEBI-pushed user-experience requirement rather than a formal regulation, but they became standard across all major retail platforms.

Brokers also restructured their margin-funding products to comply with the upfront premium collection rule and the intra-day position-limit monitoring requirements. The operational rebuilds were significant: pre-trade risk checks moved from end-of-day reconciliation to real-time enforcement at order placement.

Capital migration and behavioural response

Initial post-November 2024 data suggested partial migration of retail F&O capital toward alternative speculative venues including:

Stock options (single-stock F&O), where the contract-size revisions were less restrictive.
Short-dated futures rather than options on the surviving weekly expiries.
Off-exchange speculative venues including crypto and equity intraday cash trading.

Whether the framework structurally reduced retail derivatives losses (the stated SEBI objective) will be observable only over a multi-year horizon as follow-up studies in 2026-2027 assess net trader outcomes post-implementation.

Common confusion points

“Entry barrier” terminology

SEBI did not use the phrase “entry barrier rules” in the official circular. The term emerged in financial press coverage describing the cumulative effect of the six measures on minimum capital and access. The official SEBI title for the framework was the more neutral “Measures to strengthen the index derivatives framework for increased investor protection and market stability.”

Lot size revision vs contract value increase

The contract size measure is technically a notional value target, operationalised through lot-size revision. Some retail communications conflated the two, leading to confusion about why specific lot sizes changed. The lot-size change is the mechanism; the notional value target is the policy lever.

Margin pledge framework unchanged

The September 2020 margin pledge framework was unaffected by the October 2024 measures. The two frameworks address different layers (pledge framework: how securities collateralise margin; entry-barrier framework: how the underlying margin and access parameters are set). Both apply concurrently.

External references

References

Securities and Exchange Board of India, “Measures to Strengthen the Index Derivatives Framework for Increased Investor Protection and Market Stability,” circular dated 1 October 2024, sebi.gov.in, accessed May 2026.
Securities and Exchange Board of India, “Study on Profile and Performance of Individual Traders in the Equity Futures and Options (F&O) Segment,” September 2024, sebi.gov.in.
Securities and Exchange Board of India, January 2023 study on retail F&O profitability (earlier study referenced as comparator).
National Stock Exchange of India, implementation circulars for the October 2024 derivatives framework, nseindia.com, accessed May 2026.
Bombay Stock Exchange, implementation circulars for the October 2024 derivatives framework, bseindia.com, accessed May 2026.
NSE Clearing Limited, margin and position-limit framework documentation, nseindia.com, accessed May 2026.
Zerodha pledge and margin support documentation, support.zerodha.com, accessed May 2026.
Zerodha Varsity Modules 4 and 5 on Futures Trading and Options Theory, zerodha.com/varsity, accessed May 2026.
Financial press coverage of the October 2024 framework rollout and retail behavioural response, archives 2024-2025.

Reviewed and published by

WebNotes Editorial Team

The WebNotes Editorial Team covers Indian capital markets, payments infrastructure and retail investor procedures. Every article is fact-checked against primary sources, principally SEBI circulars and master directions, NPCI specifications and the official support documentation published by the intermediary in question. Drafts go through a second-pair-of-eyes review and a separate compliance read before publication, and revisions are tracked against the SEBI and NPCI rule changes referenced in the methodology section.

Last reviewed: 18 May 2026
Conflicts of interest: WebNotes is independent. No relationship with any broker, registrar or bank named in this article.