More than 2 million people will be better off refusing work under Universal Credit.
Despite the government's promise that work will always pay under the new system, working women may lose out in large numbers.
Couples with children are likely to be hit hard; the more people work, the more they pay in tax and national insurance, and the more they will lose in means-tested benefits under the plans.
Universal Credit, which will be implemented nationwide from October 2013, was promoted by Prime Minister David Cameron as a way to ensure “it always pays to work. Read more about 2 million better off refusing work under Universal Credit