I'm a UK freelancer doing various design projects for some EU clients (Italy/France). I'm registered as a sole-trader in the UK and I've just sent my first invoice to a client. The client has asked for a certificate of my UK residence so that their government understands that I will be paying tax in the UK (this is what they've told me).
Is there an easier way of doing this? The process for getting a certificate of residence is around 15 days, and if I have to apply for one each month I send an invoice then it becomes a problem.
Should I include my UTR number on the invoice? What can I do?