Hi, I have worked on book covers for publishers in the US for the last 7 years of being a freelance illustrator, and never had any issues with invoicing and payments. However, this latest invoice for a US publisher has come back with them requesting that I need a US Tax ID number (even though I live and work in the UK?) in order to avoid being taxed 30% of the fee at their end. I have questioned this over and over with them, but they insist it is correct. So I will be taxed 30% in the US, and then 20% in the UK, which seems ridiculous. Has anyone else ever come across this? The only thing I can think to do in future is add 30% extra on to my fee.