Which type of self accessment (self employment / non-self employment) should be register?

I am retired and I have no other income except interest from my saving account. So which type of self accessment (self employment / non-self employment) should be register?

Hi,

There is a Self Assessment criteria tool here:

Check if you need to send a Self Assessment tax return

If you meet the criteria for completing a Self Assessment tax return and do not have business income from being a sole trader or partner in a business, you would choose the non-self employed option.

Thank you.