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        Even though the salary is paid in home country, it was earned in the U.S. 
 
Hence, the salary is subject to U.S. taxation. 
 
The per diem is a reimbursement for expenses.  If properly accounted for, it is not taxable.  If paid with no accounting, it is fully taxable.
     
     
    
    
    
    
    
    
  
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