Poor working families will still be among the hardest hit by George Osborne's austerity measures despite the U-turn on cuts to tax credits, according to a think tank's analysis.

The Resolution Foundation said working households on universal credit are set to lose an average of £1,000 in 2020, rising to £1,300 for those with children.

Its analysis of tax, benefit and minimum wage changes announced by the Chancellor since the election shows that the average loss among households in the bottom half of the income distribution is £650, while there is no average loss at all among the top 50%.

The think tank's director Torsten Bell said the changes announced in the July Budget and yesterday's Autumn Statement risked undermining universal credit, the Government's flagship welfare reform programme.

The Chancellor abandoned the bulk of his planned cuts to tax credits but pointed out they "are being phased out anyway as we introduce universal credit".

Mr Bell said : "The focus in recent months and on the day of the Autumn Statement was rightly on the immediate impact on family budgets of tax credit changes next April.

"That reinforces how welcome the Chancellor's decision to reverse those changes is. It will have reassured millions of working families that were set to be significantly worse off next April."

But he added that other cuts announced in July's Budget remained in place and will affect millions of households as universal credit is rolled out across the country.

"New Resolution Foundation analysis shows that these cuts fall overwhelmingly on poor working families," he said.

"The most damaging changes are to universal credit, the Government's flagship welfare programme which is at serious risk of being undermined.

"For working households with children on universal credit, the average loss with be £1,300 in 2020. These changes will also increase the risk of people being trapped in low-paid short-hours work."

Meanwhile, Labour highlighted research indicating that the bulk of Mr Osborne's welfare cuts would fall on women.

Figures compiled by the House of Commons Library show women are still being hit three times harder than men by changes to welfare spending and taxation, despite the tax credits U-turn.

The data indicated that o f the £16 billion being raised in the current Parliament, including changes to universal credit, childcare support and child benefit, £12 billion is coming from women.

Shadow equalities minister Kate Green said: "Women are bearing the brunt of the Chancellor's economic mismanagement. David Cameron's claims that he cares about women's equality are proving to be totally hollow.

"This Chancellor's gender blindness means women continue to suffer the burden of cuts."