Sorry for the late reply - I've been away! The US tax number, basically, is so that you DON'T have to pay US tax on your royalties - otherwise some, but not all, publishers will deduct 30% before they pay you.
As others have explained it WAY better than I could, I'll link you to this comment on josephine_myles' lj. :)
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The US tax number, basically, is so that you DON'T have to pay US tax on your royalties - otherwise some, but not all, publishers will deduct 30% before they pay you.
As others have explained it WAY better than I could, I'll link you to this comment on