That figure would be a drop in the bucket of the over $7 trillion in federal budget deficits projected during that period. It is also minuscule compared to the many hundreds of billions it would cost to repeal the alternative minimum tax, which Obama's budget last month said he would replace with the Buffett rule tax.
The alternative minimum tax, originally aimed at ensuring that wealthy Americans pay taxes despite deductions and other breaks, has begun affecting upper middle-class families. Congress acts every year to minimize its impact.
The Buffett rule has become a leading symbol of Obama's and congressional Democrats' election-year efforts to persuade voters that they are the party championing economic fairness. Republicans have mocked it as one aimed at scoring political points that would have little real budgetary impact.
The plan is named for billionaire investor Warren Buffett, who has said taxes on the rich are too low. Obama has proposed requiring that people earning at least $1 million annually pay at least 30 percent of their income in taxes, but has provided few details.