When do I have to state my VAT number? by Bianca 30. September 2019 30. September 2019 Please ask a tax advisor of your choice. They’ll give you the best overview of all requirements. 0 comment FacebookTwitterLinkedinEmail Leave a Comment Cancel Reply Save my name, email, and website in this browser for the next time I comment. * By using this form you agree with the storage and handling of your data by this website.