Canadian ​corporations ​and ​individuals ​with ​business ​interests ​in ​the ​United ​States ​are ​often ​confused about ​when ​to ​file ​a ​U.S. ​tax ​return. Canadian ​individuals ​providing ​services ​to ​U.S. ​customers ​or ​Canadian ​corporations ​engaged ​in ​a ​U.S. trade ​or ​business ​are ​required ​to ​file ​a ​U.S. ​tax ​return ​with ​both ​the ​Internal ​Revenue ​Service ​(IRS) ​and possibly ​U.S. ​states…

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