New figures by the Resolution Foundation have found that the removal of the £20 uplift and changes to the taper rate announced at the Budget will mean 120,000 more people will be in relative poverty after housing costs.

The recent changes will leave 1.3 million families better off than before the withdrawal of the £20 a week boost to UC last month and make 330,000 more families eligible for support, but 3.6 million families will remain worse off, say the think tank.

The report finds that the changes will benefit 1.3 million higher-earning families in receipt of UC. For example, a single-earner couple with two children earning £30,000 will receive £2,800 in UC under these new rules, compared to £2,200 before the removal of the £20 uplift.

But for 3.6 million families (composed of all those in non-working UC families, and those in work but on lower incomes) these changes will not compensate for the removal of the UC boost. More than half of families on Universal Credit will still be worse off by over £1,000 a year.

These new changes will also mean 330,000 more families will become eligible for UC as a lower taper rate extends support further up the income distribution, partially reversing the decision to prevent middle-income families claiming tax credits (the precursor to UC) after the financial crisis.

A home-owning couple with two children can now claim UC if they earn up to £37,700, compared to £32,800 prior to the latest Budget changes, or £40,500 under the pre-2010 tax credit system.

The report finds that the Budget package will significantly reduce relative poverty, but not by enough to outweigh the poverty increase caused by the removal of the £20 uplift.

The combination of ending the £20 per week boost and the taper changes will mean 120,000 more people living in relative poverty (after housing costs). Because the taper rate benefits higher-earning working families on UC, there will be 40,000 fewer people in poverty in working families, but 160,000 more people in poverty in out-of-work families.

Karl Handscomb, Senior Economist at the Resolution Foundation, said: “The Chancellor announced two very welcome major changes to Universal Credit in the Budget last week, which will boost the incomes of low- and middle-income working families.

“These changes will allow millions of workers to keep more of each extra pound they earn as a result of marginal effective tax rates falling to rates last seen a decade ago. An additional 330,000 families will also become eligible for Universal Credit.

“But while welcome, these changes are not enough to offset the damage from the recent £20 a week cut to Universal Credit. While 1.3 million families on Universal Credit will be better off, almost three-quarters of UC families will see their incomes fall this Autumn as the cost of living crunch bites.

“Universal Credit has performed extremely well during the crisis. But the recent cut in support means that our basic safety net remains far too weak to support families facing economic bad news.”