I have been approached to write a short article (dictionary entry) and will get paid a small amount to do so (around £50-60). The dictionary and publishers are based in Germany and they have asked for my bank details and 'Tax number' for processing payment. Im wondering if the tax number they are looking is the equilavent of the UK's NI number? Maybe someone with some experience working with employers in europe/overseas would have some insight? If not i'm not sure what the tax number they have requested is - the article & payment is in no way connected to my employment (where I am PAYE) so the tax code from there wouldn't be relevant! And as a one-off article with no contract etc. I wouldnt expect to have to declare myself as self-employed and need the unique tax ref for that?