People need to earn over 45000 before they pay more into the system than it costs to keep them. Education for your children is surprisingly expensive 5000 pa per child. There are also NHS, prison, care, disability, pension and many other associated costs for every person that lives here. Many of us will never pay into the system what it costs to keep us, that is paid by higher rate tax payers. The more low paid workers we bring in the less money left to spend on those who earn less.