The number of children growing up in poverty in working households is set to be a million higher than in 2010, according to a new study.
Research for the TUC estimates that 3.1 million children with working parents will be below the official breadline this year.
Around 600,000 children with working parents have been "pushed" into poverty because of the Government's benefit cuts and public sector pay restrictions, said the report.
The study by Landman Economics found that Northern Ireland follows only the East and West Midlands for the biggest increase in child poverty among working families.
TUC general secretary Frances O'Grady has said, "Child poverty in working households has shot up since 2010.
"Years of falling incomes and benefit cuts have had a terrible human cost. Millions of parents are struggling to feed and clothe their kids.
"The Government is in denial about how many working families just can't make ends meet.
"We need ministers to boost the minimum wage now, and use the social security system to make sure no child grows up in a family struggling to get by."