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The Lib Dems would create a "different kind of economy", reducing reliance on the City while giving people the help they need, leader Nick Clegg is to say.Prime Minister Gordon Brown will also focus on the economy on Tuesday, while Conservative leader David Cameron is to discuss his party's policy on welfare.
Two new opinion polls suggest the Liberal Democrats are in second place, behind the Tories and ahead of Labour.
Tuesday is also the deadline for people to register so they can vote on 6 May.
'Reckless and greedy'
Mr Clegg is to use his daily news conference to say his party would "break up the banks, to protect people's everyday savings from ever being used again to fuel the casino culture of the global financial industry".
"To ensure that never again can the banks hold a gun to the head of the rest of the economy, we will impose a new banking levy of 10% on banks' profits until such time as they can be broken up, to ensure they pay for the guarantee they are receiving from the taxpayer," he will add.
He is also to discuss allegations that investment bank Goldman Sachs defrauded investors during the sub-prime housing crisis. The bank denies the charges.
"The allegations about Goldman Sachs are yet another reminder of how reckless and greedy the global banking industry had become," Mr Clegg will say.
"The great tragedy is that none of that recklessness or greed has yet been stamped out of the City of London, and it is costing jobs and businesses day by day."
On Sunday Mr Brown demanded a "special investigation" into Goldman Sachs after reports that the bank was to pay bonuses totalling £3.5bn, with the prime minister calling the system one of "moral bankruptcy".
The Conservatives have said they would push for an international agreement to stop banks carrying out large-scale trading using their own money.
Opinion polls
The opinion polls published in two of Tuesday's newspapers suggest the Liberal Democrats continue to enjoy more support than Labour but less than the Conservatives.
A YouGov poll for the Sun put the Conservatives up one at 33%, while the Lib Dems dropped two points to 31% and Labour gained one to stand at 27%. Interviews with 1,509 adults took place on Sunday and Monday.
And a week-on-week Opinium survey for the Daily Express suggested the Tories were down seven points to 32%, the Lib Dems had risen 12 points to 29% and Labour fell five points to 26%. For this, 1,957 adults were interviewed between Friday and Monday.
In a third poll the Tories were on 32%, up one percentage point on Monday, while the Lib Dems and Labour lost and gained one point respectively, leaving them level at 28%.
The ComRes poll for ITV News and the Independent interviewed 1,003 adults on Saturday and Sunday.
Row over 'peers'
Meanwhile two business leaders who backed the Tories' plans for a National Insurance cut were nominated to become peers in January, the Conservatives have confirmed.
But the party insisted the move was not linked to the campaign against Labour's planned rise in National Insurance.
The Guardian said the appointments of Next chief executive Simon Wolfson and JCB chairman Sir Anthony Bamford would be announced "imminently".
Tuesday is the final opportunity for people to register to include their names on the electoral roll and ensure they have the right to vote in the general election.
Forms are available from local authorities and the Electoral Commission, which saysare not currently listed.
And the Scottish National Party and Scottish Green Party are due to launch their manifestos later.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.