<prompt> Human: Hello,Im an American in Australia; Ive been working here and saving Aussie dollars for several months. I am unsure how long Ill be here. I could leave in a few months or a few years. I am wondering what the best thing to do is with the money I save. Im not familiar with the various tax ramifications of having money here or converting it to American dollars at some point.Lets say I have anywhere from 20k-50k in savings. Should I: Convert it to American dollars when I go back to the States Invest it here? If so, what are good investments? Do something else with it?I appreciate any thoughts, ideas or advice - Im not a super literate in financial matters such as this. I am open to advice for the sake of opening up a thought process - I understand that this is the Internet, I dont plan on executing on any advice at the moment. :Thanks!  <response>: Since youre planning to move back to the US, keep most of it in USD and invest it in the US. Keep just enough in AUD to cover emergency expenses. 