If you live outside the U.S., are a writer and have sold books in the U.S. during the 2017-18 financial year, you will no doubt have received a Form 1042-S 2018 (Foreign Person’s U.S. Source Income Subject to Withholding) from Amazon or whomever you sell your books through.
If so, you will need to complete Form 1040NR (U.S. Nonresident Alien Income Tax Return), attach Form 1042-S, and lodge it with the Internal Revenue Service.
Instructions for filling out this form can be downloaded at:-
and mailed to:-
Department of Treasury
Internal Revenue Service
Austin, TX 73301-0215