New STT, MTF rules kick in from April 1: What changes for stock market traders and brokers

Indian stock market participants are confronting a dual regulatory overhaul from April 1, with sharply higher securities transaction taxes (STT) on futures and options (F&O) and tighter collateral norms for margin trade funding (MTF) set to alter trading economics and potentially redirect capital flows across equity derivatives.

The Union Budget 2026‘s STT increases of 150% on futures and 50% on options take effect alongside the Reserve Bank of India’s new bank guarantee rules requiring 100% collateral for proprietary trading, up from 50%. The convergence targets a segment that dominates market activity: proprietary traders and high-frequency trading firms, which together account for approximately 50% of equity options premium turnover and 30% of cash turnover, according to Jefferies.

“We see prop traders as most affected as costs could increase on higher cash collaterals and the recent STT increase,” Jefferies said in an earlier report, noting that stricter collateral requirements of 25% cash margin relative to bank guarantees “could increase costs at a time when STT has also been hiked.”

The futures segment faces the steepest adjustment. STT will rise to 0.05% of notional turnover from 0.02%, a levy applied to the full contract value rather than just premiums paid.

“In the futures segment, STT has increased by 150% which is a massive hike,” said Ashish Nanda of Kotak Securities. “Additionally, in Futures segment STT is levied on notional contract value. Therefore, volumes in the futures market are likely to take a hit as a lot of traders could move the future volumes to synthetic futures.”

That migration to synthetic futures, constructed through options strategies, reflects emerging arbitrage between the two tax regimes. “Institutions/HNI’s who use futures for hedging purposes may use the options route to create synthetic futures which will be cheaper than trading in futures after the STT hike,” Nanda said.

Options markets appear more resilient to the tax shock. STT rises to 0.15% of premium turnover from 0.1%, a 50% increase but one applied only to premiums rather than notional values. “In options, however, the hike is a bit calibrated at 50%,” Nanda observed. “There could be some near term drop in volumes in options too but I believe volumes will come back as the impact is not as material as in futures.”Shrey Jain, CEO of Stocko by InCred Money, characterized the timing as unexpected. “The increase in STT announced in the budget and becoming effective from April 1 did come as a surprise to some market participants,” he said. “Hike will impact retail and high-frequency traders as their transaction cost will go up substantially.”

Yet Jain suggested the impact may prove selective rather than systemic: “Transaction cost changes may influence certain trading strategies at the margin; the broader participation trend remains intact.”

The collateral requirements present a different pressure vector. “Retail brokers should see limited impact given they already meet collateral requirements, and MTF book is mostly self-funded,” Jefferies said.

“Impact will however be noticeable on the proprietary trading side where 100% collateral will now be mandatory for making a BG (bank guarantee) as against 50% earlier,” Nanda said. The transition will unfold gradually: “While the impact is significant it doesn’t start immediately as all bank guarantees don’t expire on 1st April. Overall, the impact would be visible over a period of the next 12 months because bank guarantees will expire throughout the 12 months.”

Margin trading facilities, by contrast, remain largely insulated. “Life doesn’t change much after the new rules come into force for MTF lending,” Nanda noted, adding that MTF book expansion and contraction tracks market cycles naturally: “MTF book expands in the bull market and shrinks in the bear market. There’s nothing to be excessively concerned about. The book is well spread across 2000 odd stocks.”

Some market participants view the regulatory tightening through a longer lens, believing past STT increases failed to materially dent trading volumes and may even channel capital toward longer-term investing and mutual fund participation.

The test begins Tuesday: whether India’s derivatives markets absorb the dual shock through strategy adjustments and reallocation, or whether the combined weight of higher taxes and stricter collateral triggers a more fundamental reset in trading behavior.