India has one (https://en.wikipedia.org/wiki/Securities_Transaction_Tax https://en.wikipedia.org/wiki/Securities_Transaction_Tax). Retail investors don't choose

India has one (https://en.wikipedia.org/wiki/Securities_Transaction_Tax https://en.wikipedia.org/wiki/Securities_Transaction_Tax). Retail investors don't choose to day trade options because of some rigorous financial analysis, so they aren't going to be discouraged by any feasible transaction tax rate.