According the legislation of my country there is no tax for bitcoin transactions. Even more there is no VAT because bitcoin is considered not a coin, like as fiat, but an agreement between two parties
In any bitcoin doesn't have tax for transactions. But if you wish you could consider minig fees as the tax for your every transaction. Apart from this fees there is no any charges for bitcoin.
It could not be in the name of tax but you are right we can consider the fees as tax. We are online and government does not control us but when people are earning they also have to spend for the fees when transacting and that could be something we have to be happy of as the tax or fees is in a very small amount of money unlike in real world, government impose bigger taxes.