Work and Pensions Secretary Iain Duncan Smith has told ITV News that the proposed benefits cap is about "fairness."
He said, "we're doing what is necessary to get the deficit sorted and fairness to people in work, see their salaries not rise by anything like that what people on benefit have."
MPs have voted in favour of a Government measure to cap benefits rises. The Work Secretary says it will save £5bn from the welfare bill.
The Department for Work and Pensions has calculated the savings that the exchequer could expect if the benefit cap passes this evening.