Hi, How do I change from self employed to limited company?

Hi Vincent, thanks for joining the Community - it's not possible to switch directly between the two due to differences in products, instead, you'd need to export your data and cancel the account before creating a new QuickBooks Online subscription from our website. We've got a guide linked here with the steps to take when moving to ensure you take as much data with you as possible, if you have any further Q's, get back to us below. 🙂