Do I have to save my VAT registration application while I complete any forms I have been asked to attach?
HM Revenue and Customs recommend that you enter all the information required for your VAT registration application before you download and complete any forms you have been asked to attach. You should then log out of the online tax registration service. Any information you have already entered will be automatically saved for you.
Once you have completed the forms you must log back into the service and attach them to your VAT registration application.