Thank you ! So must I mail these Form 1040-X and Form 1040-NR to the IRS? Personally I think I cannot simply efile them on Turbotax or Sprintax.By the way, if I...

Many thanks for your help!Now my problem is that I have not used Sprintax before, so I must file an original return on Sprintax before I am able to file an amen...