Ministers say Universal Credit will increase incentives to work, reduce in-work poverty and simplify the system.
Universal Credit will replace benefits including income support and housing benefit with a single payment.
He handed to journalists a ten point rebuttal of the recurring criticisms of Universal Credit.
For more information about universal credit, visit the Department for Work and Pensions website.
Universal Credit calculations depend on salary data from HMRC's new PAYE Real Time Information system.
Child benefit, housing benefit and universal credit will be capped for two years from 2014-15.
"The Chancellor fully supports the Universal Credit reforms and any suggestion otherwise is untrue, " we were told.
The bill simplifies the welfare system by replacing existing benefits with a single, universal credit from 2013.
The transition to Universal Credit will take place in three phases over four years, between 2013 and 2017.
He says the uncertainty is making him wonder whether he will want to rent to universal credit claimants.
One of the reforms is the introduction of the single, universal credit to replace six income-related, work-based benefits.
Officials from the Department for Social Development also briefed members on the implementation of universal credit in Northern Ireland.
And that's followed by another Estimates Day debate, this time on the government's big benefits reform, the Universal Credit.
It is for that reason so many questions are being asked about the practicalities and implications of Universal Credit.
As conditions change (a claimant finds part time work, say), the universal credit will be reduced, but not eliminated.
Under the universal credit, claimants will get a single payment, instead of potentially several, separate payments as happens currently.
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But it warned that business was not ready for the Universal Credit system, which will replace many state benefits.
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Under the changes six benefits, including housing benefit, would be brought together in a single, monthly Universal Credit payment.
The increase will start in 2013 when the Universal Credit comes into force.
The Universal Credit is intended to make the benefits and welfare system much simpler and improve incentives to work.
Ministers said Universal Credit would help millions of people by making them better off in work than on benefits.
The bill aims to simplify the welfare system by introducing replace existing benefits with a single, universal credit from 2013.
Then, from April 2014 until October 2017, the rest of those affected will be moved onto universal credit in stages.
The bill is designed to simplify the welfare system by replacing existing benefits with a single, universal credit from 2013.
He is similarly concerned about the impact of the new Universal Credit paid into a bank account and accessible only online.
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But government plans to test a new universal credit - which combines several benefits into one payment - have been delayed.
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Paying housing benefit directly to recipients, rather than their landlords, will form a key part of the planned new Universal Credit.
Iain Duncan Smith, the work and pensions secretary, wants to replace six housing and work benefits with a single universal credit.
The other three job centres - in Wigan, Warrington and Oldham - will not start handing out Universal Credit until July.
The shift to the universal credit system would enable people to work themselves and their families out of poverty, ministers said.
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