Iain Duncan Smith claims more than £10 billion of public money has been lost in fraud and error under the tax credit system put in place by Labour.
In a scathing attack on the welfare model of the last government in today's Daily Telegraph the work and pensions secretary said tax credits were "not fit for purpose", and that the system was "wide open to abuse" and "haemorrhaging money."
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David Cameron said the measure, which will save £4 million by 2020, showed a commitment to his "all in this together" approach.
The party has dropped its opposition to an in/out referendum on EU membership and now supports a vote, acting leader Harriet Harman said.