The amount I have deducted from my tax codefor Child Benefit has increased from £1133 to £2941 for next years tax code. My circumstances haven't changed, I still only have a claim for one child. Can anyone explain why this would be. Also I'm a little confused that they are making a deduction from my tax code as I pay when I do a self assessment firm every year. Can anyone explan this too me? Any help or guidance would be much appreciated.