what I am asking is how the value of tax is determined by bitcoin which we all know so far that the price of bitcoin is always changing in an instant, is tax at a value with the ongoing btc price?
Of course. They'll be using somewhere like Bitpay most likely which sets the price the moment you're charged. I seriously doubt any government department is going to become a Bitcoin holder. The money flies out as quick as it comes in.
I think governments are observing how much will be demand on it. To my mind thyley don't plan to become bitcoin holder but just offer bitcoin payments as an alternative method among other available options.
Also news isn't old guys but not hot to be fair, along with Canada, USA also accepts tax to be paid by bitcoins in Ohio state.
Perhaps we will see other states/towns/cities or evem countries to follow this path.