Speaking in Bedford - where Tory premier Harold Macmillan delivered his famous "You've never had it so good" line in 1957 - Mr Miliband said: "A One Nation Labour Budget next month would lay the foundations for a recovery made by the many, not just a few at the top.
"Let me tell you about one crucial choice we would make, which is different from this Government. We would tax houses worth over £2 million. And we would use the money to cut taxes for working people.
"We would put right a mistake made by Gordon Brown and the last Labour government.
"We would use the money raised by a mansion tax to reintroduce a lower 10p starting rate of tax, with the size of the band depending on the amount raised.
"This would benefit 25 million basic rate taxpayers - moving Labour on from the past and putting Labour where it should always have been - on the side of working people."