"Hi, IRS? I've got a billion dollars worth of 'other, unspecified' income I need to pay taxes on in Cash. My name? Uh...."
Even ill gotten gains are taxable and the theory of one crime at a time suggests that even “other, unspecified” could be with paying taxes on to reduce the likelyhood of successful criminal persecution.
That said, pay your taxes even if you’re a criminal for sure!