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This was bound to happen and it's already happening, to give you one example would be of India Bitcoin rate touching 900 usd. People put their black money in Bitcoin. And people over the globe are doing it, cause no one really taxes Bitcoin and it's not even necessary to show it in our statement, so people have a merry. Or pay in cash and take Bitcoin one type of laundering also.
This you are telling until bitcoin is not considered as illegal in your country but once the government comes to know of this illegal activity then if they state Bitcoin as illegal to use then where will you go with the bitcoin you are holding as if you sell and get cash in your bank you will be tied up to show the transaction.
So still if bitcoin comes to legal status then surely their will be some tax law and users will have to pay taxes on bitcoin use
There's just one slight difficulty, which country can claim it owns btc, and how will they do it. Let's assume you are in a X country the government wakes up and says let's tax Bitcoin. Now your friend lives in Y country. What if I transact all to Y country, and accepts Y country currency. So how will government tax that, what ever way, they try some one will find one way or other. I have been seeing so far there seems to be no law to tax, now things can change with the etf brining into focus Bitcoins. Let's see what happens but in near future no tax on Bitcoin.