Iain Duncan Smith will face fresh questions from MPs over the scale of delays to the Government's flagship welfare reform when he appears before a Commons committee.
The Work and Pensions Secretary has admitted the 2017 target for the full introduction of Universal Credit is set to be missed - with around 700,000 claimants facing a longer wait.
But Labour said official figures showed that only a tiny fraction of the numbers due to be using the new system by the time of the next general election would be transferred on time.
Only a "handful" of the promised 1.7 million would be switched by 2014/15 and only 400,000 by the following year - less than 10% of the original target, the Opposition said.
Shadow work and pensions secretary Rachel Reeves said the extent of the delay was set out in data released by the Office for Budget Responsibility (OBR) alongside the Chancellor's Autumn Statement.
"David Cameron and Iain Duncan Smith repeatedly promised to deliver their flagship policy 'on time and within budget'," she said.
"That claim, and the credibility they staked on it, now lie in tatters.
"For months on end the Government have tried to avoid answering questions about Universal Credit but these OBR figures tell the truth of how (they) have broken their promises on a spectacular scale.
"They have been forced to admit that they have completely missed their targets and Universal Credit will not now be rolled out before the election.
"David Cameron and Iain Duncan Smith are presiding over a complete mess and it is taxpayers who are picking up the bill with at least one hundred million pounds of their money written off."
Ministers claim the initial roll-out of Universal Credit - which combines six means-tested benefits into one monthly payment designed to ensure people are better off working than on benefits - has been a success.
They point to figures suggesting it is encouraging more people to look for jobs in what Mr Duncan Smith described as a "cultural shift".
But critics say the limited implementation of the scheme - which has been plagued by IT and other problems - only involve the least challenging cases.
And it was branded "inadequate" and open to fraud in a scathing report by a cross-party committee.
The Commons public accounts committee found that at least £140 million had already been wasted on the project, which was blighted by "alarmingly weak" management.
Giving evidence alongside Mr Duncan Smith at the work and pensions select committee will be Howard Shiplee, the former London Olympics executive drafted in earlier this year to "reset" the programme amid growing concerns over delays and IT issues.
The Secretary of State may also be questioned about reports - which he denies - that he sought to have MPs pin blame for the failures on the DWP's chief civil servant Robert Devereux.
In his reply to the Autumn Statement, shadow chancellor Ed Balls taunted Mr Duncan Smith, commonly known as "IDS", over the reforms, suggesting it stood instead for "In Deep Shambles".
In written evidence to the committee, the DWP said it was " confident that it has taken, and continues to take, the right remedial steps to address past issues in the Universal Credit programme."