Hi,
If you need to register for Self Assessment for property income then you are not self employed:
Register for Self Assessment if you are not self-employedso you can submit the SA1 registration.
If your mother is already registered as self employed she would not need to register agian.
To update the record with the new address and power of attorney you need to send the orginial or certified copy with a covering letter to
HMRC,
Self Assessment & PAYE, BX9 1AS UK
Thankyou.