Why are my Child Benefit repayments more than I received for the 2022/2023 tax year?

I've just completed my tax return, providing all the necessary information from my P60, P11D etc. I have a private pension on which I claim standard tax relieve, and that's it. I have 3 children (16, 13 and 13), and the calculation for the child benefit received is £2,636.00. Can anyone explain to me why, when I complete my tax return the repayment figure is returned as owing £2,738.60 or £102.60 more than I've received in child benefit. I earn over 60K a year meaning I should payback 100% (or £2636 only), but HMRC have decided that I somehow owe an extra 1.26% . I do not owe anything from previous years and I'm PAYE. So where has this additional child tax come from?

Hi

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Thank you.

@Paul Maber A Self Assessment return isn't just to collect the High Income Child Benefit Charge, it also establishes any additional income tax due for the year. For example you mention P11D. Your tax code might have included a provisional amount of company benefit but the actual benefit can be different meaning more tax is owed for other reasons than just HICBC. Or do you mean the HICBC element of your Self Assessment calculation is greater than the Child Benefit? Unfortunately you haven't really made it clear exactly what the issue is and tax is all about the detail.