Turbo Tax does not calculate basis, that is entered by the user, The program will calculate gain or loss for you. If you imported your transactions, you need to verify that the correct basis was imported. If your cost basis is zero then any money made is pure gain and fully taxable.
Pub 550 covers investment income.
If you have a foreign wallet, that is considered a foreign asset and may require filing Form 8938. See About Form 8938, Statement of Specified Foreign Financial Assets.
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