Child benefit back dated further than 3 months?

Thinkingitover

My 3rd child was born in 2017 when Child Tax Credits was capped at 2 children, I wrongly presumed this to be Child Benefit. It was only this year I realised, HMRC have back dated 3 months and I have to appeal for further, has anyone had any success going back more than 3 months or am I wasting my time?

Alice_Holt

https://www.citizensadvice.org.uk/benefits/child-benefit/help-with-your-child-benefit-claim/how-to-claim-child-benefit/#:~:text=If you were eligible for,bank account every 4 weeks.

poppy12345

You are wasting your time. The maximum time is 3 months. 

TELLIT01

Unless you can provide written evidence that you were wrongly advised by a Government department you are not going to get anywhere.  You acknowledge that you simply misunderstood what the rules applied to so you were not wrongly advised.