Restarting self assessment because of different venture

Hi, I originally registered for self assessment when I was doing some self employed work as an actress. I informed HMRC a few years ago when I stopped as I didn't want to unnecessarily fill out self assessment tax forms and I was then a PAYE employee. I am now looking to set up my own business as a sole trader so will need to restart self assessment. Do I need to inform anyone of this, or do I just request the self assessment forms when the time comes, as I am still registered? My business name will be different, does that matter, and is it relevant when it's just sole trader and so not registered with Companies House? Thanks

Hi,

You will need to complete form CWF1 to register as Self-Employed, and on processing we will re-activate the UTR you previously had.

If you were to just register for Self Assessment, you may not be charged the correct amount of National Insurance when you complete your tax returns.

Register for Self Assessment

Thank you.