The chancellor has ruled out a U-turn on axing the 10p tax rate, saying it would be "totally irresponsible" to "unravel...or rewrite" the Budget now.
But Alistair Darling told the BBC he "would return" in future Budgets to help those hit by the move.
Critics should look at it alongside tax credit and pension changes which had helped lower earners, he said.
But leading Labour rebel Frank Field said promises of "something undefined" in the future did not go far enough.
And Conservative leader David Cameron said Mr Darling should "get off his backside" and get into the Treasury to rewrite his Budget. Mr Cameron told BBC Radio 4's The World This Weekend that the Conservatives would be "trying to get the government to stop and think again" on a "pre-meditated tax grab" on 5.3 million people.
But Alistair Darling told the BBC he "would return" in future Budgets to help those hit by the move.
Critics should look at it alongside tax credit and pension changes which had helped lower earners, he said.
But leading Labour rebel Frank Field said promises of "something undefined" in the future did not go far enough.
And Conservative leader David Cameron said Mr Darling should "get off his backside" and get into the Treasury to rewrite his Budget. Mr Cameron told BBC Radio 4's The World This Weekend that the Conservatives would be "trying to get the government to stop and think again" on a "pre-meditated tax grab" on 5.3 million people.
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