To be eligible to open children bank account with Santander “under 13 mini current account” it needs to be opened by an adult/parent/guardian, this will be the case until the child turns 11, after their 11th birthday they can then choose whether to hand the account over to the child or it can be approved and transferred by the adult/parent/guardian, or if the trustee wants to keep in control of the account they can until they turn 18. From 13 onwards you would need to allow the young person/child to open the “1/2/3 mini current account” themselves. What you get : 3% monthly interest on the entire balance (£1,500 up to a maximum of £2,000)