US President Barack Obama, in a step designed to appeal to voters, will propose a "Buffett Tax" on people making more than $1m a year as part of his deficit recommendations to Congress tomorrow.
Such a proposal, among suggestions to a congressional super-committee expected to seek up to $3 trillion in deficit savings over ten years, would appeal to his Democratic base ahead of the 2012 election but may not raise much in revenues.
White House Communications Director Dan Pfeiffer said the tax would act as "a kind of AMT" (Alternative Minimum Tax) aimed at ensuring millionaires pay a minimum rate of tax that at least matches that of middle-class families.
The "Buffett Tax" refers to billionaire US investor Warren Buffett, who wrote earlier this year that rich people like him often pay less in tax than those who work for them due to loopholes in the tax code, and can afford to pay more.
Mr Obama will lay out his recommendations in White House Rose Garden remarks and is expected to urge steps to raise tax revenue as well as cuts in government spending.
Those could include reforms of the Medicare and Medicaid government healthcare programmes for elderly and poorer Americans.
The White House has already said Mr Obama will not recommend any changes to the popular Social Security federal retirement plan.
Mr Obama, who has been hammered in opinion polls over his handling of the faltering economy, wants to use his plan to counter Republican claims he is a 'tax-and-spend' liberal as he campaigns for re-election next year.
Congress is at liberty to ignore his suggestions and Republicans, who control the US House of Representatives, have said that they will not agree to tax hikes.
If Mr Obama pushes for tax increases that stand little chance of being passed by a divided Congress, it may help him blame lawmakers for thwarting his plans at a time when the public's opinion of Congress has touched record lows.
But he is also under pressure to show leadership after rating agency Standard and Poor's cut the US AAA credit rating, and as investors scrutinise Washington for evidence it can curb the country's towering deficit and mounting debt.
The supercommittee of six Democratic and six Republican politicians must find at least $1.2 trillion in deficit savings before the end of the year to avoid painful automatic cuts, and is mandated to seek savings of up to $1.5 trillion.
Those savings are on top of $917bn in deficit reduction agreed to in an August deal to raise the US debt limit and Mr Obama wants the supercommittee to go further.
He has separately urged the supercommittee to consider $467bn in tax increases on top of that goal to pay for a jobs bill he unveiled earlier this month.
He has repeatedly called on Congress to close tax loopholes for "millionaires and billionaires" as he seeks to draw a sharp distinction between himself and the Republicans before next year's election.