Labour has stepped up calls for the Government to drop its planned cut in the top rate of tax.
The party released details of its private polling showing that 71% opposed the reduction from 50p to 40p for earners on more than £150,000 a year, due to come in next April.
The survey by pollsters ICM found opposition was almost as high among Tory voters, with 65% against the cut going ahead.
Shadow Cabinet Office minister Michael Dugher said: "In tough times David Cameron has chosen to give 8,000 people earning over £1 million a tax cut of at least £40,000. Meanwhile, millions pay more and his failed economic plan has taken us into the longest double-dip recession since the Second World War.
"This isn't fair. We need a One Nation prime minister who will take decisions in the interests of the whole of Britain, not one who puts millionaires before the millions."