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How long do you have to live somewhere to be a resident for tax purposes?
If you are going to be trying clever stuff with taxes in different place, you probably need a professional. Different countries definitely have different laws on the subject.  For example (several years ago) the UK considered you absent from the UK for tax purposes from the day you left, provided you were gone for a year, whereas Canada didn't charge you tax as long as you were not in the country for six months in the year. A carefully timed move enabled me to not pay tax at all for six months because I wasn't resident anywhere. Also it was irrelevant whether I intended to stay or not.