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Are there tax liabilities (in the US) for having a US bank account while I am abroad?
I don't think so in your case. Unless the account generates so much interest income that it became reportable (I don't know the exact limit, but I think it's in the hundreds if not thousands of dollars, you might get a 1099 form if it generates over $10 of interest income, but you don't have to file taxes if your overall income is too low anyways). The US does not typically tax assets, only income. There are some states (Florida is the only one I can think of) that has odd tax treatment of intangible assets, but I doubt that would apply in your case. If this were a large enough amount, usually over $10,000, it might trigger some reporting requirements (possibly by your home country).