My customer is in Finland and I am not VAT registered

Hello, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question. You have perfectly correctly issued an invoice without a VAT element as you are not registered for the tax. Your customer clearly wants a VAT invoice because, not unreasonably, they wish to reclaim same although, of course, there isn't any. You will have to tell them that you are not registered for VAT in the UK and that registration is not compulsory if your turnover does not breach the 82K threshold in any year. Some EU states do not have a threshold at all and some view the British system with the deepest suspicion. When I ran the accounts for a company not registered for VAT all the invoices carried a note to that effect to preclude inquiries of this nature. I do hope that I have shown you a way forward in this matter.