Child Benefit is administered by HMRC's Child Benefit Office, which maintains its own records separately from other HMRC systems. After a deed poll, you should notify the Child Benefit Office of your name change to ensure your claim records and any correspondence are in your correct name. You can do this by calling the Child Benefit helpline (0300 200 3100) or by writing to the Child Benefit Office at Newcastle. You will need to provide a certified copy of your deed poll.
Your Child Benefit payments will continue uninterrupted during and after the name change process. If your payments go directly to your bank account, those payments continue as normal, provided your bank account details have not changed. If you are updating your bank account at the same time as your name, be sure to notify the Child Benefit Office of your new account details as a separate update, as payment details and personal details are handled separately.
If you are also changing the child's name (for example, if a child is taking your new surname), that is a separate process. Changing a child's name requires the consent of all people with parental responsibility and involves a deed poll for the child, not an adult deed poll. Contact the Child Benefit Office once that process is complete to update the child's name on the claim.