Nonresident Alien withholding for Foreign Persons:

http://www.irs.gov/Individuals/International-Taxpayers/Forei...

http://www.irs.gov/Individuals/International-Taxpayers/NRA-W...

I would prefer this all not be fact, and I wish it were not true, but I put this out there because I hope it isn't but it seems like it definitely is real and effectual. This is the biggest difficulty I've hit myself.