"There is going to be a large number of middle class families that are going to be severely disadvantaged", Hanlon said.
Taxpayers in the top 1 percent of incomes - above $730,000 - would receive about 50 percent of the total tax benefit from the tax overhaul, with their after-tax income forecast to increase an average of 8.5 percent, the group said.
While most taxpayers would benefit at least modestly, taxes would increase for others, particularly those with incomes of $150,000 to $300,000.
The bottom 95 percent of taxpayers could expect a tax cut of 0.5 to 1.2 percent, according to the analysis.
Cohn said officials were also working to prevent wealthy individuals from taking advantage of proposals to cut taxes on so-called "pass-through" corporations, in which a company's income passes to its owners.
"By 2027, taxes would rise for roughly one-quarter of taxpayers, including almost 30 percent of those with incomes between about $50,000 and $150,000 and 60 percent of those making between about $150,000 and $300,000", the study said. But these ideas could undermine some of Trump's claims that the middle class as a whole would benefit from the changes.
About one in eight families, especially households earning low-to-mid six figures, would see taxes go up. That may allow Mr Trump to say that his changes to income tax do not benefit the rich, when averaging across states. Trump's plan would lower the highest personal tax rate they pay from 39.6 percent to 25 percent.
Preliminary evaluations say the cuts could reduce revenue by more than $2 trillion over a decade.
Much about the proposed tax plan has yet to be finalized, including the income cutoffs for three new tax brackets that will replace the current seven marginal rates.
"One percent of GDP means $3 trillion". But the plan also could end up serving another goal: revenge on Never Trumpers.
The Republican tax reform outline actually maintains the mortgage interest deduction, but other parts of the plan seriously undermine it. "Democrats and Republicans in Congress should come together to deliver this giant win for the American people and begin the middle-class miracle once again", he told a crowd at the in state fairgrounds Farm Bureau Building.
The report also used static scoring, which does not factor in potential economic growth in the years after the plan's implementation.
When Republicans attempted to use the 2017 budget process to repeal Obamacare earlier this year, they didn't provide a 10-year plan for reducing the deficit. And it could cut taxes for the rich too much.
The administration has come under scrutiny in recent weeks for failing to get a health care bill through Congress, and for the possibility of delay on the GOP tax plan. He said the tax cut plan was a core element. And the framework specifies a few vague revenue-raisers, like a limit on deductibility of corporate debt payments, that TPC couldn't model. That includes about 13.5% of middle income filers, who would pay an average of $1,000 more.