美国与加拿大也有双边税务协定:
https://www.fin.gc.ca/treaties-conventions/USA_-eng.asp
也是约定,当一个人在两国本国所得税法意义上都被视作居民的时候,要用“打破平局规则”来解决,即最终只能判定这个属于其中一国居民,而为另一国非居民:
Where by reason of the provisions of paragraph 1 an individual is a resident of both Contracting States, then his status shall be determined as follows:
(a) he shall be deemed to be a resident of the Contracting State in which he has a permanent home available to him; if he has a permanent home available to him in both States or in neither State, he shall be deemed to be a resident of the Contracting State with which his personal and economic relations are closer (centre of vital interests);
(b) if the Contracting State in which he has his centre of vital interests cannot be determined, he shall be deemed to be a resident of the Contracting State in which he has an habitual abode;
(c) if he has an habitual abode in both States or in neither State, he shall be deemed to be a resident of the Contracting State of which he is a citizen; and
(d) if he is a citizen of both States or of neither of them, the competent authorities of the Contracting States shall settle the question by mutual agreement.
所以也是,即使你离开加拿大去美国定居后仍然在加拿大留有永久居处,只要你的重要利益中心转移到了美国,则你就属于美国居民 ,而非加拿大居民;当重要利益中心也无法确定时,你在哪一国的家里居住的时间较多,你就属于哪一国居民。