Trading costs
Securities Transaction Tax (STT) Explained
STT is a statutory transaction tax, but the taxable side and rate depend on the security and market segment.
Reviewed 1 September 2026How the estimate works
The arithmetic is taxable transaction value multiplied by the applicable STT rate. The difficult part is identifying the correct value, side and current rate—not performing the multiplication.
Delivery and intraday are not interchangeable
An equity delivery transaction and an intraday transaction should not be assumed to use the same rate or taxable side. Derivatives and other products introduce additional distinctions.
Verify the effective date
Tax rates can change. Check a current government, regulator or exchange source and keep the applicable date with any published rate table. The calculator intentionally allows rate entry rather than silently treating a default as permanent.
What the calculator does not decide
It does not determine a user’s tax liability, capital-gains treatment or which transaction category applies. Those questions may require a qualified tax professional.
Primary and authoritative sources
Sources support factual context. Share Market Open remains responsible for its explanations and calculator assumptions.