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Britain's poorest working families would be £2,000 richer if three of George Osborne's key Budget changes had never happened, shock figures reveal.

Research for MPs shows the devastating toll of the Chancellor's welfare cuts on minimum-wage workers - even after they're paid the 'national living wage'.

The new rate of up to £9 an hour, which begins for over-25s in April, will boost family finances by £1,427 a year by 2021.

But cutting tax credits and freezing child benefit will cost those same families £3,465, leaving them £2,038 worse off overall.

The horrifying figures punch a hole in David Cameron's election pledge to help 'hard-working people' and pull people off the benefits 'merry-go-round'.

And it casts a shadow over MPs who will vote today to slash tax credits after a debate lasting just 90 minutes.

How Tory Budget costs the poorest £2,000 HoC Library; for 2-child families on 35hrs minimum wage

The research was compiled by the House of Commons library.

Its figures show a family with two children and a parent working 35 hours a week on minimum wage currently earns £11,402 a year after tax.

Once tax credits and child benefit are added on, that income rises to £21,699 a year.

The research then looked at two scenarios up to 2021 - one with three of July's main changes, and the other without them.

Without the Budget measures, income rose to £13,693 by 2021. Another £10,045 came from tax credits and child benefit - a total of £23,738.

With them, income rose more quickly to £15,120 because of the national living wage. But only £6,580 was added on top, leaving a drastically lower total of £21,700.

That is just £1 a year more than minimum-wage families make now.

Last week the independent Social Security Advisory Committee warned the Tories haven't given enough evidence to support their tax credit cuts.

New Labour leader Jeremy Corbyn has vowed to fight the changes - despite Labour abstaining earlier this year on plans to limit child tax credit to two children.

He called the cuts a 'quite appalling attack on many of the poorest people in this country'.

The left-winger said during the leadership campaign: "There are a number of points on which I wish to challenge.

"The first is the Chancellor’s really strange statistic that Britain spends 7% of the world’s welfare budget, which is, he said, way above the average of every other country.

"He may be unaware of it, but many countries in the world have no welfare budget of any sort.

"In large swathes of Africa and Latin America, there is no public assistance for people in poverty or desperation.

"It is a ludicrous statistic plucked out of the air."

Overall the research says the worst-off will be 2.9 million unemployed households who lose an average of £2,070 a year.

Second-worst will be the 7 million working families who are eligible for tax credits, losing an average of £1,130 a year each.