Plans unveiled by Labour would see pension tax relief for top earners slashed to provide guaranteed jobs for the long-term unemployed.
Those earning more than £150,000 would only get 20% relief on savings for their retirement, rather than the 50% maximum available now, and 45% per cent from April, Shadow Chancellor Ed Balls wrote on PoliticsHome.
The proposal is similar to one announced by the Labour government in 2009, which was later scrapped by the coalition. A Treasury source said:
Ed Balls is trying to spend the same money twice. That means more borrowing and more debt - exactly how Labour got us into this mess in the first place.
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John McDonnell promises voters they can expect to see "no increases in income tax for middle or low earners" in Labour's election manifesto.
The prime minister has confirmed the Conservative government will not increase VAT if they win the General Election on June.
Liberal Democrat leader Tim Farron insists his party can be the "strong opposition that Britain desperately needs".