You only owe the tax when you bring it in the country. The Younger Biden could have parked every nickel of $50,000 a month in a Cayman Bank.
George Papadopolous has talked about Biden + Jr’s kickbacks for facilitating Soros/Deep State interests being laundered through Cyprus and scrubbed of identification. George was in Cyprus and named Halper and Downer as trying to set him up there with the convenient $10,000 in cash they assumed he would try to take home, where they had a search warrant waiting at the airport for $10,000 cash which he did not bring but was arrested anyway because Deep State reasons. They thought they had leverage on this guy who knew their dirty dealings.
The real story out of Ukraine is that it is the nexus where Steele, Downer, Halper, Biden, the Dossier and Soros meet. Rudy Giuliani alluded to as much on Ingraham last night.