Every time you buy or sell a listed share or an equity ETF, the broker deducts Securities Transaction Tax. A few paise per share. You never see a cheque for it. You do not claim it. You do not fight it. And yet it is the reason your LTCG on listed equity is 12.5% and not 30%, the reason STCG is 20% and not slab rate, and the reason buybacks (which are not STT-paid) became taxable at slab after Budget 2024. STT is the silent keystone of equity taxation in India.
By the end, you will know the STT rate by transaction type, the "STT-paid" eligibility that unlocks concessional capital-gains rates, and when STT turns from feature to bug.
The STT menu
Delivery buy. 0.1% of turnover (buyer pays).
Delivery sell. 0.1% of turnover (seller pays).
Intraday sell. 0.025% of turnover (only seller pays; buyer pays zero).
Equity F&O futures sell. 0.02% of notional value.
Equity options sell. 0.1% of option premium (not notional).
Equity options exercise. 0.125% of intrinsic value.
Equity MF (units purchased on exchange). 0.001% (negligible).
STT is charged on turnover, not profit. So it affects frequent traders materially even when they make minimal per-trade margins. A day-trader doing Rs. 5 crore monthly turnover pays ~Rs. 50,000 in STT alone on intraday sells. But STT is deductible for business traders (ITR-3) against business income; it is not deductible for capital-gains investors, baked into the 12.5%/20% concession instead.
Why STT matters for capital gains
Section 112A and 111A apply concessional capital-gains rates (12.5% LTCG above Rs. 1.25L / 20% STCG) ONLY to STT-paid transactions on a recognised stock exchange. The policy logic: STT is a transaction-level tax that generates government revenue whether or not the shareholder makes a profit; in exchange, profits get a concessional rate. Off-market transfers, unlisted shares, delisted shares. All do not qualify, and jump to the general Section 112 regime (12.5% without indexation post Budget 2024. For most asset classes still OK, but no Rs. 1.25L exemption) or slab rate (for STCG).
Equity shares that went through IPO ARE STT-paid from the IPO allocation onward (listing marks the STT eligibility). Shares acquired via ESOP and then sold on the exchange within the 24-month holding. STT-paid on sale = 20% STCG. Shares in unlisted startups transferred via share purchase agreement. Not STT-paid, taxed under 112 for LTCG.
When STT is a feature (and when it is a bug)
Feature: long-term equity investors pay ~0.1% STT on buy and sell plus 12.5% LTCG = roughly 12.7% effective tax on a 10-year hold. Compared to slab-rate taxation of a debt fund (up to 30% + cess), the concession is massive. Bug: high-frequency F&O traders pay material STT on every sell leg; over a Rs. 100 crore annual turnover, STT alone is Rs. 2-4 lakh. An unrecoverable cost unless they are profitable enough to absorb it as business expense.
Buyback not STT-paid (post Oct 2024)
Shares tendered to a company buyback are NOT STT-paid, so they do not get 12.5%. Budget 2024 introduced a whole new buyback regime: taxable in the shareholder's hands as deemed dividend at slab rate. This is the canonical "STT matters" case. The same underlying equity, sold on exchange vs tendered in buyback, has vastly different tax outcomes.
Buyback not STT-paid
Shares tendered to company buyback are not STT-paid. Post Oct 2024: taxable as deemed dividend at slab. Pre-Oct 2024: company paid 23.3% BBT, shareholder got net cash. Either way, no 12.5% LTCG concession.
F&O is speculative / non-speculative business, not STT-paid capital
F&O trades pay STT but are taxed as business income (intraday cash = speculative; futures/options = non-speculative per section 43(5) proviso). Not as capital gains. STT there is a minor cost input, not a rate-concession trigger.
Mutual fund units. STT on equity MF sale via exchange only
Equity mutual fund units redeemed directly from the AMC: no STT, but still eligible for 12.5% LTCG under section 112A (special carve-out. Fund-level STT paid on underlying assets). Units sold on stock exchange (rare, some ETFs): 0.001% STT. Either way, LTCG rate applies.
Key Takeaways
STT is deducted silently on every listed-equity transaction (per section 98).
STT-paid is the eligibility key for 12.5% LTCG / 20% STCG under sections 112A / 111A.
Off-market, buyback (post Oct 2024), and unlisted-equity transactions miss STT-paid status.
F&O pays STT but is taxed as business income regardless. STT is a business cost.
Delivery buy + sell: total STT ~0.2% on total turnover, baked into the equity concession.
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STT keeps listed-equity rates low. F&O, however, is business income. And the loss treatment is both worse and better at the same time. A careful walkthrough of section 43(5) for the derivatives trader.
