Suppose you, as a random Irish citizen, want to buy a car in the US and just drive around during the 6 months of your tourist B2 visa stay. Should you pay incom

Suppose you, as a random Irish citizen, want to buy a car in the US and just drive around during the 6 months of your tourist B2 visa stay. Should you pay income tax on the money you bring to the US to buy a car? I don't think so. Similarly, should you pay income tax on the money you bring to US to buy some stocks? I don't think so either. Now, the company that brings the money to invest in the US stocks is just some random Irish company that just happens to be owned by US company Apple Inc.