If they’re us-resident there should be no problem, assuming the person travels on the us passport outside of Canada. They’d have to travel with two passports going to Canada, as each country expects to see their passport upon entry. Canada doesn’t tax non residents like the us so there’s no tax changes without moving into Canada, and there’s currently a tax treaty for that.
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If they’re us-resident there should be no problem, assuming the person travels on the us passport outside of Canada. They’d have to travel with two passports going to Canada, as each country expects to see their passport upon entry. Canada doesn’t tax non residents like the us so there’s no tax changes without moving into Canada, and there’s currently a tax treaty for that.