SEBI F&O curbs and STT hike reshape retail trading

Why India’s F&O debate is trending again

India’s equity derivatives market is being reset on two fronts. Social media has focused on SEBI’s tighter index derivatives rules since late 2024. It has also focused on the Union Budget 2026-27 decision to raise STT on derivatives. The revised STT rates apply to transactions entered into on or after April 1, 2026. The government has framed the direction as curbing excessive retail speculation. It has also said the intent is not to block access outright. The Income Tax department clarified that other STT rates remain unchanged. Together, the changes raise friction costs for frequent traders.

SEBI’s first wave: fewer weekly expiries

A core SEBI step was to rationalise weekly index derivatives. From November 20, 2024, SEBI limited weekly index-derivative expiries to one per benchmark index per exchange. This cut the total to six contracts monthly from 18, as cited in discussion. The objective stated in the context was to reduce excess activity. Fewer expiries can reduce the number of “event” sessions around expiry. It also changes how traders roll and hedge positions. For brokers, lower churn can reduce transaction-led revenue. Market participants have debated whether liquidity simply concentrates into fewer days.

Higher contract sizes changed minimum capital needs

SEBI also raised the minimum contract size for index derivatives. The minimum derivatives contract value was increased to Rs 15 lakh. SEBI also disclosed a plan to set it between Rs 15 lakh and Rs 20 lakh in future. Previously, many index futures and options contract values were between Rs 5 lakh and Rs 10 lakh. Larger lot sizes increase the capital required per position. They also raise the rupee impact of small index moves. For retail, this can reduce the ability to scale positions gradually. It also lowers the number of small-size speculative trades.

Margins tightened, especially on expiry day

Another major lever was margin and risk coverage on expiry days. SEBI imposed an additional extreme loss margin of 2% on all open short-option positions on expiry day from November 2024. Tail-risk coverage on expiry days was described as being increased. SEBI also removed calendar spread treatment on the expiry day. It also eliminated calendar-spread benefits for the same underlying asset with different expiry dates from February 2025. These steps reduce intraday leverage that relied on margin offsets. They also make short-dated strategies more expensive to maintain. The combined effect is a higher cost of carrying risk into expiry.

Upfront option premium collection reduced leverage

SEBI mandated upfront collection of option premiums from buyers. Premiums must be collected upfront by trading or clearing members. This is a direct hit to strategies that relied on delayed funding. It changes the cash management of active options traders. It can also reduce the pace of rapid intraday turnover. In the discussion, this was grouped with other steps to cool excessive activity. For brokers, operational processes around margin and funding also change. For traders, it increases the need for available cash at entry. This aligns with a broader push toward tighter risk controls.

Intraday monitoring and position limits moved into focus

SEBI also started intraday monitoring of position limits. Separate discussion cited tighter ceilings for stock derivatives in the 5-8% range, linked to liquidity classifications. The same discussion described a phased approach through mid 2026, including client notifications and later automatic position blocking. It also described transition protections for existing positions through June 30, 2026, followed by full compliance. These details have been debated because they affect how quickly traders must adjust. They also affect strategies that build positions across accounts or time windows. The stated regulatory direction is to curb systemic risk and protect retail participants. Social media commentary has treated this as a structural shift, not a temporary measure.

Budget 2026: higher STT raises per-trade costs

The second force is a direct tax increase on derivatives transactions. Budget 2026-27 proposed higher STT on derivatives effective April 1, 2026. For options, STT on the sale of an option in securities rises from 0.1% to 0.15% of the option premium. For options where the contract is exercised, STT rises from 0.125% to 0.15% of the intrinsic price. For futures, STT on the sale of a future in securities rises from 0.02% to 0.05% of the traded price. The increase is widely discussed as making high-frequency trading less viable for small accounts. It also adds to the impact of larger contract sizes and tighter margins. The government’s messaging has emphasised moderating speculation rather than closing markets.

Volumes, participation, and broker business models

The public discussion includes early signals in activity metrics. Options trading volumes in India were cited as having dropped 51% in FY26 after SEBI tightened rules. The same thread attributes the drop to higher contract sizes, uniform expiries, upfront premium collection, and higher transaction taxes. Another data point cited by the government was that individual investors trading equity derivatives fell by nearly a fifth to 7.86 million. These figures are being used to argue both sides of the debate. Some see a healthier market with less expiry-day churn. Others see higher barriers and fewer participants. Discount brokers are watching closely because transaction-led revenue can be sensitive to F&O volumes. Further, RBI’s stricter lending rules for brokers were also mentioned as an added constraint.

SEBI’s new proposal: standardised strikes and closing VWAP

SEBI has also proposed a standardised framework for options strike prices across exchanges. The stated objective is to address intraday volatility. The proposal aims to ensure the availability of contracts around prevailing market prices. That would support continuity and ease for market participants. A specific method discussed is a blended VWAP using the last 30 minutes plus 10 minutes of the Closing Auction Session. This is part of a broader focus on how closing prices and strikes are derived. Traders are debating whether standardisation reduces arbitrage across venues. They are also debating whether it changes expiry-day behaviour. The proposal sits alongside talk of longer-duration derivative contracts, which is still described as early conceptual.

Will eligibility rules come next for retail traders?

Some proposals discussed online include income thresholds and qualification tests. Others suggest accredited-investor style access for derivatives. Separately, regulatory representatives indicated the possibility of product suitability rules for speculative segments. SEBI officials have also noted the challenge of implementing suitability restrictions. So far, the regulator has refrained from restricting retail access through suitability due to practical complexity. Still, the idea remains part of the conversation because costs alone may not fully address behaviour. If suitability is adopted, it could change onboarding and disclosures at brokers. It could also segment the market by account profile and experience. For now, the confirmed changes are higher costs, fewer expiries, larger lots, and tighter risk controls.

What traders are adjusting right now

Retail strategies are being reworked around the new cost and margin reality. Expiry-day short option positions are more expensive to carry due to added margins. Higher STT increases the drag on frequent buy-sell cycles. Larger contract values reduce the ability to trade very small size. Upfront premium collection makes cash management more important. Many traders are shifting focus from rapid intraday turnover to fewer, higher-conviction trades. Others are reassessing whether hedges are worth the extra cost. Market participants also expect volumes to decrease, particularly for retail traders, based on the discussion. The main open question is how quickly behaviour stabilises under the combined SEBI and tax changes.