Yes bitcoin has a tax everytime you are going to make an transcation using pear to pear or person to person as you can see every time you are going to send bitcoin the tax are input in the transaction details or every time you are going to withdraw your money or exchange it into fiat currency. Hoping that goverment will not impose taxes soon.
I don't think that the money we have to pay every time we have a transaction is tax. I mean bitcoin is not regulated by any government so how can bitcoin have tax? But I also wonder that where the money for sending bitcoin goes because apparently it doesn't go to the hand of neither the governments nor the third parties.