WASHINGTON — An analysis of the Republican tax bill released Tuesday predicted that tax cuts for lower- and middle-income taxpayers would fade over the course of a decade, more so than they would for high earners.

The analysis by Congress’s Joint Committee on Taxation found that about 80 percent of tax filers earning from $50,000 to $75,000 would receive a tax cut from the bill in 2019. By 2027, just 60 percent of taxpayers in that same income group would see a tax cut. Of those earning more than $1 million, three-quarters would see a tax cut in 2019, and by 2027, two-thirds of millionaires would continue to see a tax cut.

A second analysis from the committee, released Tuesday evening, found that recent changes to the bill appear to have left it over the $1.5 trillion that Republicans have set as a cap for its cost.

On Monday, the House Ways and Means Committee approved a package of changes to the bill, including a revision that watered down a proposed excise tax on foreign affiliates of multinational companies. The set of changes added about $160 billion in lost revenue to the bill over the course of a decade, leaving it, in the joint committee’s estimation, with a total revenue loss of about $1.57 trillion. Under the budget blueprint approved by Congress last month, the tax measure can add no more than $1.5 trillion to budget deficits over a decade.