Hi,
If you are changing the legal entity of the business then you have a choice between cancelling the VAT number as a partnership and applying for a new one for the sole tradership or treating the change as a change of legal entity
If you want to keep the same VAT number then please see the guidance below:
Register for VAT
If you do not want to keep the same VAT number then please send in a VAT 7 to cancel the partnership and a VAT 1 to register the sole tradership.
Thank you.