The sharp increase in securities transaction tax (STT) has dramatically raised the breakeven threshold for derivatives traders, pushing the cost of a round-trip Nifty futures trade to as much as 20–25 index points and rendering many high-frequency and algorithmic trading strategies economically unviable, market participants said.
According to Rohit Srivastava, the revised tax structure has fundamentally altered the risk-reward profile of intraday and systematic trading.
“On a Nifty futures lot at current levels, STT alone now costs about 10–12 index points on the exit leg, compared with roughly 4–5 points earlier,” Srivastava said. “Once you factor in all charges and execution costs, total round-trip trading costs that were once around five points now approach 20 to 25 points, which guts profitability for high-frequency and intraday strategies.”
Srivastava said this forces traders to wait for significantly larger market moves just to break even. “Anyone doing day trading, HFT or algo strategies now has to price in a much bigger Nifty move just to make a profit. That alone can make many models in the market unviable,” he said.
Market participants noted that while retail traders have already faced tighter regulatory curbs in recent years, the STT hike directly impacts foreign institutional investors and proprietary desks running systematic and turnover-heavy strategies.
“This will hit volumes across broking companies, institutional desks and small proprietary trading shops. It affects the entire ecosystem,” Srivastava added.
Volumes Likely to Take a Hit
Brokerage executives said the magnitude of the tax increase is large enough to materially alter trading behaviour. Dhiraj Relli, managing director and chief executive officer of HDFC Securities, said the higher transaction burden is likely to weigh heavily on participation.
“The increase in STT on F&O is clearly negative for volumes. A 20% to 30% decline in trading activity from here cannot be ruled out,” Relli said. “This significantly raises transaction costs, and liquidity will be a major concern going forward.”
Relli also highlighted the scale of the hike. “This is not a marginal change of two or three basis points. For Nifty futures, STT has risen by roughly 150%, and for options it is about a 50% increase. It is a very large jump in trading costs,” he said.
Institutional Participation at Risk
Asset managers cautioned that while curbing speculative excess is a legitimate policy goal, the move could unintentionally dampen institutional participation.
Radhika Gupta, managing director and chief executive officer of Edelweiss Mutual Fund, said the impact goes beyond retail traders.
“What also gets curbed are other participants in the F&O market — institutions, arbitrage funds, proprietary desks, many of whom are FIIs,” Gupta said. “That could lead to a fall in aggregate F&O volumes.”
Why the Math Matters
Under the new regime, STT on index futures has been raised to 0.05% from 0.02% on the sell leg, while taxes on options premium and exercise have also been increased. At current Nifty levels, this translates into double-digit index point costs per trade, sharply raising friction and forcing systematic traders to recalibrate turnover-heavy strategies.
Market participants said the next few weeks will reveal how much activity migrates to lower-frequency strategies or exits the market altogether.
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