My biggest problem

I actually made a book with KDP using my cover. However being a dual nationality (UK and USA) they ask if I am a US citizen and I tick yes. That's when the problem starts, I don't pay taxes here and for the few years I lived in the States, I didn't have to pay taxes. However I have no idea how to answer the question they ask on the KDP site. Anyway I phoned customer service and got a human. I was so surprised that I nearly dropped the phone. He explained that the tax form is nothing to do with Amazon. I would have to make enquiries with the US tax people. Sigh! 
I can honestly say that the many, many books I made on Lulu never caused me so many problems once I'd mastered the wizard (making PDF files etc.)