Child benefit and self assessment

Afternoon, I have this year had to completed a self assessment for the first time and have encountered some figures I’m not sure of being correct. I have a single child so received £1248 the standard amount for that year. I believe I own 37% of the 1248 which works out as 461 and change, in my self assessment I am being charged over 500 why would this be?

Hi,

This forum is for general queries only and is intended to help you self-serve. We are unable to provide specific advice tailored to individual circumstances. 

You may wish to contact our Self Assesment team:

Self Assessment: general enquiries

Thank you.