STT hike has caused a severe sell-off in Indian stock market during a special Sunday trading session on February 1, 2026, as Finance Minister Nirmala Sitharaman announced a sharp increase in the Securities Transaction Tax (STT) on derivatives. The move, aimed at curbing excessive speculation in the futures and options (F&O) segment, triggered a "bloodbath" on Dalal Street, wiping out over ₹6 lakh crore in investor wealth.

What is STT Tax in the Share Market?

Securities Transaction Tax (STT) is a direct tax levied by the government on every purchase and sale of securities—including equity shares, futures, and options—conducted on recognized stock exchanges. Introduced in 2004, it is deducted upfront at the time of the trade, regardless of whether the investor makes a profit or a loss.

What is Getting Changed in Budget 2026?

According to The Economic Times, the Finance Minister proposed a significant hike in STT rates to "moderate speculative activity" and generate additional revenue. The new rates are:

• STT on Futures: Increased by 150%, rising from 0.02% to 0.05%.
• STT on Options Premium: Increased from 0.1% to 0.15%.
• STT on Exercise of Options: Raised from 0.125% to 0.15%.
  

Why was STT hiked in the 2026 Budget?

The government cited two primary reasons for the steep increase:

Curbing Speculation: There has been an "unchecked explosion" of retail participation in the F&O segment. Regulators (SEBI) have repeatedly warned that nearly 90% of retail traders lose money in options trading.

Revenue Generation: The hike is expected to provide a "course correction" while simultaneously generating additional tax revenue from high-frequency and high-volume derivatives trading.

Why did Market Crash Today? Reasons behind Sensex and Nifty's fall

The announcement led to an immediate panic among traders and investors, causing the Sensex to plummet by over 2,000 points and the Nifty 50 to skid below the crucial 25,000 mark. For futures traders, the tax has more than doubled (from 0.02% to 0.05%), significantly raising the "break-even" point for every trade. Higher costs are expected to thin out trading volumes, particularly for high-frequency traders and arbitrageurs who operate on thin margins.

The announcement caused an immediate collapse in stocks that rely on trading volumes for revenue. Shares of BSE Ltd, Angel One, and Groww (Billionbrains Garage Ventures) plunged by as much as 13.5%. MCX witnessed its worst single-day fall since the pandemic, crashing nearly 19% as investors feared a significant drop in future trading activity.