The taxpayer is facing bills of an extra £1.4 billion because of the "chaos" at the Department for Work and Pensions (DWP) who are ushering in huge changes to the benefit system, Labour will say.
The low take-up rates for youth contracts, rising fraud, problems in the delivery of work capability assessments and the cost of implementing universal credit will all be criticised in a speech by Liam Byrne.
Shadow work and pensions secretary will claim bills for Iain Duncan-Smith's reforms will run into the next Parliament.
Mr Byrne will repeat Labour's call for a bankers' bonus tax to fund a jobs guarantee for young people.
More top news
The OPCW have left the site of the suspected chemical weapons attack in Douma and should have results in about a week, ITV News understands.
First Minister Carwyn Jones revealed his plans in his speech at the Welsh Labour conference.
Army personnel have praised Prince Harry for changing lives ahead of this year's Invictus Games in Sydney.