The Congressional Budget Office on Tuesday said the Senate-passed legislation to avert the "fiscal cliff" will add nearly $4 trillion to federal deficits over a decade, largely because it extends low tax rates for nearly every American.

The congressional scorekeeper's analysis could fuel further debate about the legislation, which could come to a vote in the U.S. House of Representatives on Tuesday afternoon.

CBO said the fiscal year 2013 deficit would be about $330 billion higher than if Congress fails to act and lets $600 billion in higher taxes and spending cuts take effect. (Reporting By Kim Dixon and David Lawder; Editing by David Gregorio)