Thank you ErnieS0 for your response.
The point is that I will use W-2 to report my income and paid US tax to Canada Revenue before their due date in April. If I do so, I won't probably pay any income tax to Canada Revenue because of the withheld income tax amounts on W-2 which paid to the US.
Now, if I will do extension and apply to IRS as a resident for the full 2021 year this will be definitely after April (after filing tax to Canada Revenue). Most of the tax withheld amounts on W-2 will be then refunded by IRS because we will be treated as residents filing jointly.
Then, should I report those refunded credits to Canada Revenue because I would have actually paid less tax to IRS than I have originally reported?
Sorry for asking many questions but I am really confused. I appreciate your help!!
