Shadow work and pensions secretary Liam Byrne said this was a particularly worrying area.
For Labour, shadow work and pensions secretary Liam Byrne urged ministers to listen to the concerns.
Shadow work and pensions secretary Philip Hammond said they showed Mr Brown had been "conning the country".
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But shadow work and pensions secretary Chris Grayling said the issue should have been addressed years ago.
Shadow work and pensions secretary David Willetts said the government was offering only more consultation, not any conclusions.
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But shadow work and pensions secretary Liam Byrne claimed the bulk of the cuts would affect working households.
For Labour, shadow work and pensions secretary Liam Byrne accused the government of presiding over an increase in unemployment.
Shadow work and pensions secretary Liam Byrne welcomed the fall in unemployment, but added the figures showed "shaky foundations".
Shadow Work and Pensions Secretary Liam Byrne says the revelation demonstrates that even welfare officials recognise the hardship being caused.
"No wonder unemployment is higher today than when this government came to power, " said shadow work and pensions secretary Liam Byrne.
But Shadow work and pensions secretary David Willetts claimed the report revealed Labour had let "the cat out of the bag".
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Labour's shadow work and pensions spokesman Liam Byrne said the long-term unemployed needed to be "working or training and not claiming".
"Never before have working people paid so much in and got so little back, " shadow work and pensions secretary Liam Byrne said.
Shadow work and pensions secretary Chris Grayling said he was extremely sceptical about the announcements which were "headline grabbing" with "very little substance".
"We have another rushed U-turn which offers nothing more and no protection for disabled children, " shadow work and pensions secretary Liam Byrne said.
On Thursday Liam Byrne, the shadow work and pensions secretary, accused the Government of "Stalinesque" interference in the work of local job centres.
Shadow work and pensions minister Lord McKenzie of Luton claimed it was part of a wider bias in the government's approach to legislation.
For Labour, shadow work and pensions secretary Liam Byrne said the government's plans had thrown the retirement plans of thousands of women into chaos.
Shadow work and pensions minister Stephen Timms said Labour would "get the welfare bill down by getting the country back to work, and making work pay".
Shadow work and pensions minister Lord McKenzie remarked that if the government's plans did indeed represent a universal credit, it was a universe "full of black holes".
Shadow work and pensions secretary Liam Byrne raised a point of order in the House of Commons on Monday afternoon to ask "who knew what and when".
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For Labour, shadow work and pensions secretary Liam Byrne called it a "very hazy and half-baked plan from the prime minister, when what we really need is a serious back-to-work programme".
Shadow work and pensions minister Yvette Cooper welcomed the announcement.
Speaking on BBC Radio 4's Today programme, Shadow Work and Pensions Secretary Liam Byrne agreed that a majority of people thought benefit recipients were lazy and did not really want to work.
As MPs debated the legislation at committee stage on 15 June 2011, shadow work and pensions minister Margaret Curran called on the government to commit to continue making the payments.
Speaking from the Labour frontbenches, shadow work and pensions minister, Helen Goodman described the government's policies as "unjust" and "wanton destruction of people's lives" that demonstrates "how little the government cares".
Shadow work and pensions secretary Liam Byrne said cuts to tax credits had pushed millions of working families into poverty and now meant thousands of part-time workers were "better off on benefits".
Shadow work and pensions secretary Liam Byrne, who is in charge of the party's policy review, said Labour needed to seize the centre ground of British politics - and regain economic credibility.
Anne McGuire, the shadow work and pensions minister, said that the original timetable of assessments was "unrealistic" and there was some concern over the start date of June 2013 for new claimants' assessments.
"For those people who are in work, more will be on temporary contracts than for a very long time - the highest for 10 years, " shadow work and pensions secretary Liam Byrne told the BBC.
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