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canadian in california - filing taxes as a non-resident
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what do you mean by "canadian income"? was it income paid to you as wages for the job you did in the us? or rental/interest income in canada? if the former - then it doesn't go to nec, it goes to the main part of the return. if the latter - it doesn't appear on your nr return at all. yes, it is to validate your residency status. it has no other effect on your taxes.
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