You are certainly correct in your presumption that your tax situation may change when you are no longer a US resident. The US tax system is based on residency, and US residents are subject to US income tax on their worldwide income. If you become a resident of Canada, which has a territorial income tax system, you will become liable for Canadian income tax on your Canadian income. However, as a US nonresident alien, you may still be liable for US income tax on your US source income. It appears to me you ought to consult with a good tax attorney to ensure that you understand and comply with your tax obligations.
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You will be required to file a US nonresident 1040. You will have to pay taxes for US source income in the US. Frankly, the US makes it very difficult for international tax issues. The reason for this is that the US has a worldwide tax collection system whereas most countries, including Canada, only collect on the income of its own residents. Please contact a good tax lawyer immediately to discuss this issue.
I hope this helps!
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I don't think that this will be a problem: I think it offers potential benefits! See, for example, my article linked below.
You should get some help on your taxes if it gets complex; that won't be hard to do as many Canadian advisors are well-versed in cross-border tax issues.
As long as you handle your tax issues, you'll be fine (assuming you have a proper Canadian work permit). You might want to chat about your business structure and how to minimize your tax liability.
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All the attorneys responded correctly. I would only add that you would need to work with an international firm for your stream of income between USA and Canada. Best
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