There are no tax on bitcoins as no one control the bitcoins there is no questions of tax. However small transaction fees will always required as it will be the only income for the service provider.
Nope. Almost every country in the world requires some kind of tax on bitcoin.
Yes, it requires tax yet tax come when you convert your bitcoin into your fiat and withdraw it, and I guess transaction fees is just a tax being paid by the service given to the server. But directly bitcoins has no taxes.
And I think it can vary a lot around the world. Here in the U.S. you owe capitol gains when you convert to fiat
or when you spend bitcoin. And the fee is not a tax at all but rather a
fee for service. Only nation states (and maybe warlords) can issue a tax.