~
The top most bracket is 43% on regular income. That said, it should be noted that less than 2% of the Indian population pays any form of income tax. There are a lot of loopholes. Farmers are exempted from income tax, no matter how large is their income. The same goes for residents of certain states such as Mizoram. However gains from capital assets are being taxed at a concessional rate. For example stocks, if held for more than 12 months are taxed at a rate of 10% (and 15% in case they are being held for less than that duration).
Are you sure only 2% of the population is paying any form of income tax. With a billion population and you are saying less than 3 million people pay their income tax which is really absurd, from where you got this calculation. There might be loopholes in the system and every country will be having those loopholes but to say that just 2% of the population paying the tax is not true even according to simple google search.
A fixed 30% tax on income from digital asset is absurd, since the term loopholes were used, people will find a solution for that as well if some of them are true.