The chief executive of HM Revenue and Customs has warned parents to not leave registering for child benefits "until the last minute", on the eve of the stated deadline.
Lin Homer told BBC Radio 5 Live:
We think there are about 200,000 people who need to get off their backsides and do something.
HMRC is committed to helping people pay the right amount of tax and urges parents who have been affected by the changes to child benefit to register for self-assessment.
We know that lots of people leave it until the last minute.
More top news
A Malaysian court has found a man guilty of murdering two British medical students in Borneo.
A Liberal Democrat parliamentary candidate has said he deliberately caught HIV after years battling depression.
Noel Edmonds beat off competition from Ant and Dec to be voted Britain's favourite children's TV presenter.