STT and Trading Costs (2026): Impact on Your Tax Deductions
Note: This is general information, not tax advice, and tax rules change. Verify the current figures against the Income Tax Act, the relevant Finance Act and ICAI guidance, and confirm your own position with a qualified Chartered Accountant.
STT is a cost, and for F&O it is deductible
STT is charged on your trades regardless of outcome. For an investor reporting capital gains, STT is generally not deductible. For an F&O trader, the activity is a business, so STT, like brokerage and exchange charges, is a deductible expense against business income. That is one more reason the business-income treatment of F&O works in your favour.
The full charge stack
STT is one line in a stack of statutory charges, all deductible for an F&O business: brokerage, STT, exchange transaction charges, SEBI turnover fee, stamp duty, and GST on brokerage and charges. Missing any of them overstates your taxable profit. The complete list is in deductible trading expenses.
The bigger impact is on net returns
For high-frequency and option-selling strategies, a rate change matters more for your gross edge than for your tax bill. A few extra basis points per trade compounds across thousands of trades. The deduction recovers only your marginal slab rate of that cost, so cost discipline still matters.
Capture every charge automatically
The charges sit in your contract notes and Tax P&L, scattered across the year and across brokers. Aktai Tax auto-pulls STT and the rest of the charge stack from your statements into your expense schedule, so nothing deductible is left on the table. Check your turnover and position with the turnover calculator.
Frequently asked questions
Is STT deductible for F&O traders?
Yes. Because F&O is business income, STT paid on your trades is a deductible business expense, like brokerage and exchange charges. This differs from the position for capital-gains investors, where STT is not deductible. Confirm the current treatment with your CA.
How does an STT increase affect my tax?
A higher STT raises your trading cost, which is deductible, so it slightly reduces your taxable business profit. The bigger effect is on your gross returns: more cost per trade means you keep less, especially on high-frequency strategies.
Where do I record STT for tax?
STT is captured in your broker contract notes and Tax P&L. Pull it into your expense schedule alongside brokerage, exchange transaction charges, SEBI turnover fee, stamp duty and GST.