The changes could mean that both U.S. corporations and wealthy households end up facing smaller tax hikes.
Sen. Manchin said he's open to using reconciliation to force through tax increases without Republican votes
The $2.5 trillion in tax hikes would be in addition to $1.5 trillion proposed in Build Back Better.
Rep. Jim Clyburn of South Carolina said a scaled back credit may be a key to saving President Biden's economic agenda.
The delay to next year is the latest set back for legislation that Democrats have been wrangling over since April.
Current funding for the government expires on Friday, the impasse involves funding for Covid-19-related mandates.
Sen. Bernie Sanders said on Monday he wants the reworked SALT deduction to raise revenue for Medicare benefits.
The CBO found that the House bill contains $1.636 trillion of spending, while raising $1.269 trillion in revenue.
The party's progressive wing has resisted changes they say are too beneficial to billionaires.
Yet another attempt to compromise on taxation and spending proposals is being floated by Congress.