Hi Debbie, 

Thanks for using Sage City.

The update for v27.1 will not automatically change any of your customer or supplier accounts.

We will introduce new tax codes and have updated the VAT return (although most of these new codes are aimed for use with suppliers). You can find more information about the update in this article here >> What's new in Sage 50cloud Accounts v27.1

Hope this helps

If this has answered your question please click More > Verify Answer.

Ian