As a sole trader, my turnover is considered, NOT the amount left for an actual wage.
I think you need a better accountant. All taxes are paid, and means testing performed on, taxable income. That is your revenue minus business expenses.
The handouts equate to a 2.7 % tax break for working families.
As wikipedia would say: "citation required".
They chose to have kids.
Those kids will be changing your nappy by the time you stop paying taxes.