The whole point of child benefit is that it is paid to the mother to support the children. It used to be a tax allowance, but it is paid instead as a "benefit" so the mother can receive it - including those who are not in paid work. Abolishing it for families where there is a higher rate tax payer (usually the father) is an attack on women. If you want the higher earners to contribute more, as Osborne says, then increase higher rates of income tax, don't cut CB for families with a higher rate taxpayer.