If you live in canada in 2021 but got employment income from the US and already paid income tax to IRS, why CRA still double taxes you?

You shouldn't be doubly taxed as Canada and the US has a Tax treaty.  Please make sure that you enter your information under foreign income (since you have employment income from the US).

 

Canada’s Foreign Income Tax Credit

Using the United States-Canada Income Tax Treaty to Reduce Double Taxation

Common USA Tax Forms Explained & How to enter them on your Canadian Tax Return

 

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