That's true, if it goes back to $10, they will not ask for it. They will ask the tax only on the profit. Same way if you had bought a house $1000 and then sell it of for $1500. You have to pay the tax on $500 but I am not sure about the percentage here. For shares it is fixed at 30%. Fraud as call it, that's why you will not see a lot of Indians into Blockchain and all, because they fear that they have to pay the tax to the government.