Thanks! I live in Asia and I usually don't have to be worried about capital gain tax investing in like the US market. Just not sure how Germany taxes non European investors...
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I think it really depends on the mutual fiscal agreements between your country and Germany. I have the suspect you shouldn’t worry about that, as you mentioned the fact you can buy US stocks without problems.
Problems usually arise with dividend paying stocks, but this is not the case.

As usual, this is not financial advise, and you should always check the above statement with a local accountant and/or your bank.