The Social Security representative who sees you will tell you what other documents you may need. Benefits stop when your child reaches age 18 unless your child is a student or disabled.
Does child benefit stop automatically at 18?
To get the child benefit extension your child must not be working more than 23 hours a week and you must apply within three months of them leaving education or training. Child benefit stops when the extension period ends or when your child turns 18 , whichever comes first.
Do you get child benefit after 18?
Changes introduced this year mean that Child Tax Credit will also stop automatically when you child turns 18 or 19, unless you tell HM Revenue and Customs (HMRC) that they are in approved education or training.