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What determines a tax resident in Florida
Plenty of retired people do stay in the US for longer than 60 days and don't pay taxes. In this IRS document 60 days stay appears to be the test for having a 'substantial presence' in the US, which is part of the test for determining residency. However the following is also written: Even if you meet the substantial presence test, you can be treated as a nonresident alien if you are present in the United States for fewer than 183 days during the current calendar year, you maintain a tax home in a foreign country during the year, and you have a closer connection to that country than to the United States.  In other words, if your property in the US is not your main one, you pay tax in another country, and you stay there less than half the year, you should be treated as a non-resident (I am not a lawyer and this is not advice). This IRS webpage describes the tax situation of nonresident aliens. As I understand it, if you are not engaged in any kind of business in the US and have no income from US sources then you do not have to file a tax return. You should also look into the subject of double tax agreements. If your home country has one, and you pay taxes there, you probably won't need to pay extra tax to the US. But again, don't take my word for it.