Adding business name to existing self employed account

Hi, I have operated as self employed (under my personal name) for few years but deregistered a while ago as I stopped providing my services. I still have my UTR and can access my Self Assessment account online. I would like to reactivate my business now, as self employed but want to add business name (I will be providing exactly the same services). My question is: do I simply add the business name via "change the name" in my Self Assessment section online or do I need to register again as Sole trader with a new name? Thank you very much for your help! Anna

Hi anutek34,
If you deregistered your account, you will need to reregsiter for Self Assessment.
You can provide your business name when you do this>
Check how to register for Self Assessment
Thank you.