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India’s stock market is not just creating wealth anymore. It is quietly becoming one of the government’s fastest growing tax machines.
In the Union Budget 2026, the government raised the Securities Transaction Tax (STT) on futures and options trades, hoping to capture a larger slice of the explosive trading activity happening in the markets. The numbers show why.
STT collections have jumped dramatically over the last decade. Back in FY15, the government collected about ₹7,350 crore from this tax. By FY25, the number had surged to over ₹53,000 crore, and the FY26 revised estimate now stands at ₹63,700 crore. For FY27, the government expects it to touch roughly ₹73,700 crore.
To understand why this is happening, you first need to understand what STT actually is. Introduced in 2004, STT is a tiny tax charged every time someone buys or sells shares, futures, or options on Indian stock exchanges. It is deducted automatically during the trade. Investors usually barely notice it. But when millions of people trade every day, those tiny deductions pile up into a very large number.
And India has been trading a lot.
The real driver of this surge is the derivatives market, especially futures and options, or what traders call F&O. Over the past few years, India has become one of the largest derivatives trading markets in the world. Retail participation exploded after the pandemic, thanks to easy mobile trading apps, lower brokerage costs, and a wave of first time investors entering the market.
According to SEBI, more than 93% of individual traders in the equity derivatives segment lost money between FY22 and FY24, with combined losses exceeding ₹1.8 lakh crore during those three years. Yet the trading volumes kept rising.
From the government’s perspective, this surge in trading activity has created an unexpected source of revenue. Every options contract traded generates STT. When millions of such contracts are traded daily, the tax collection balloons even if the tax rate itself is small. That is why the government decided to increase STT rates on derivatives starting April 2026. For example, STT on the sale of options has been raised from 0.1% to 0.15% of the premium, and STT on futures has been increased from 0.02% to 0.05%.
But there is a twist in this story. While the government is collecting more tax from this trading boom, regulators are growing increasingly worried about the risks it creates. SEBI has repeatedly warned that most retail traders lose money in derivatives. In response, the regulator has introduced several measures since late 2024, including tighter position limits, standardized expiry days, and stricter monitoring of derivatives trading activity.
So India’s stock market now sits in a strange balance. On one hand, the trading frenzy is generating tens of thousands of crores in tax revenue for the government. On the other hand, the same frenzy is burning through retail investors’ savings and forcing regulators to step in with safeguards.
In other words, India’s derivatives boom is not just a financial market story anymore. It is a story about tax policy, investor behaviour, and regulatory tension all playing out on the same trading screen. And as long as the country’s appetite for fast paced market bets continues, the government’s STT meter will keep ticking upward.
