But he said the welfare-to-work programme and a plan for a Universal Benefit payments, due to start coming into effect in 2013, would succeed in getting more people into employment.
Changes to child benefit payments for the better-off - introducing means-testing for the previously universal benefit - come into effect at midnight on 7 January.
The trade-off was that, unlike old-fashioned whole life, the effective premiums for the universal policy death benefit rise as the policyholder ages.
FORBES: Retirement Disaster Looms For Universal Life Policyholders
That's followed by a ten minute rule bill from the Lib Dem John Leetch on Road Safety - and then it's on to consideration of the latest set of Lords amendments to the Welfare Reform Bill - with peers still digging their heels in over the proposed under-occupancy penalty for Housing Benefit and the Universal Credit.
European Union officials pushed for the voluntary accord, noting that universal chargers would benefit both consumers and the environment.
Child benefit, housing benefit and universal credit will be capped for two years from 2014-15.
Mr Brown has also said that he wants to concentrate any further increases in child benefit, which is a universal benefit, on those who need it most by taxing it for higher-rate taxpayers.
But in its report the committee said the Department for Work and Pensions "must provide swift assurance that the transition to Universal Credit will not leave the benefit system vulnerable to fraud".
At a time of decentralisation, the committee said it was "incongruous" for the government to be planning to incorporate housing benefit - currently administered by local authorities - into the Universal Credit.
CTC, unlike the universal child benefit, requires means-testing and that a million families who have failed to apply for the credit may therefore miss out.
They fear draft regulations explaining how housing benefit will work when it is wrapped into the Universal Credit will leave tenants unable to claim for many services.
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