Cuts to tax credits will affect nearly 43,000 children in Sheffield, an MP has said.
Paul Blomfield, who represents Sheffield Central, wants to ask ministers in the Commons about the 27,000 families that will be affected.
He said: “The Government talk about making work pay, but they are cutting the tax credits that do just that by supporting working families across Sheffield.
“To put it simply, they are attacking the living standards of people who do the right thing by going to work.”
Plans to cut spending on tax credits, paid to lower income workers or those with children, were agreed last month.
The Government says it will save £4.4bn, and is part of wider plans to raise pay and incentivise work.
Mr Blomfield has urged the Treasury minister Damian Hinds to meet a working single mother with two young children from Sheffield who works 31 hours a week and will lose £1,878 each year, a weekly cut of £36.
He said: “People are already struggling to make ends meet, but now the Government is going to make things worse by cutting this vital support net for people who are in work.”