The CBO, a nonpartisan agency charged with projecting the effects of legislation on the nation's finances, released its report Sunday before an expected fight this week over the plan's passage in the Senate.
Sunday's report could provide additional hurdles for the Republican senators still undecided on the plan given its conclusions on how net changes to revenue and spending are allocated across income groups.
People with incomes less than $30,000 would ostensibly pay more in taxes when compared to the benefits they receive under the bill, the CBO found, due in part to reduced government outlays to support health care for such low-income individuals.
Those earning less than $30,000 would be worse off under the plan by 2019, given the decrease in benefits versus their tax contributions, while those earning less than $40,000 would join the group of people who are worse off by 2021 and those earning less than $75,000 by 2027, the analysis estimates.
The agency notes, however, that it does not incorporate "the budgetary effects of any macroeconomic changes that would stem from the proposal." Some Republicans have argued that the plan would grow the economy and grow incomes, which could negate possible negative effects on taxation.
On the deficit, a more than $200 billion decrease in direct spending is coupled with a more than $1.6 trillion decrease in revenues to result in the $1.4 trillion deficit increase estimated by the agency.
The CBO previously said the tax bill passed by the House of Representatives just under two weeks ago would result in a $1.7 trillion deficit increase.