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Maybe to keep it simple, the IRS would simply accept bitcoin or other cryptocurrencies for paying taxes.
You really think that they would give any cryptocurrency the status of "legal tender"?
I don´t think they will do that, because that would increase the legitimacy of cryptocurrencies
extremely.
I know that certain Swiss municipalities allow the paying of taxes with Bitcoin, but even there
it is only a test run and limited to an amount like roughly 200 . You can imagine that the IRS
will never accept it if even progressive Swiss municipalities don´t allow it for non-negligible amounts.