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HM Revenue and Customs (HMRC) has urged parents who have not registered child benefits to do so now to avoid further fines.
This only applies to families where one parent earns £50,000 or more and who have not already opted out of the payments.
Fines for failing to register will be decided on a case-by-case basis, HMRC said.
Tens of thousands of parents could be fined for failing to register the child benefit they received this year with the taxman.
An estimated 165,000 people missed Saturday's deadline, meaning they face penalties as well as losing the handout.
Under Government reforms, households where one parent earns more than £50,000 a year have to return the benefits through the self-assessment system unless they have opted out of receiving it in the first place.
HM Revenue and Customs said the number of parents who had opted out of child benefits altogether had far exceeded expectation.