WASHINGTON — President Trump’s top economist said on Monday that a corporate tax cut being pushed by Republicans would increase a typical household’s income by $3,000 to $7,000 a year, highlighting a primary argument the administration will make in drafting and selling its tax plan.

A report by the White House Council of Economic Advisers is the first official calculation of the tax framework’s impact and its focus on cutting corporate rates underscores how central that effort is to the administration’s overall plan. Mr. Trump and Republican lawmakers have been selling their framework as a middle-class tax cut, saying the plan will put money back in workers’ pockets, including by lowering the corporate rate to 20 percent from 35 percent.

The Council of Economic Advisers report argues that high corporate taxes hurt workers in the form of smaller paychecks and that worker incomes rise sharply when corporate rates fall. It points to “the deteriorating relationship between wages of American workers and U.S. corporate profits” and says, essentially, that high corporate taxes have encouraged companies to shift capital abroad rather than flow profits to workers through pay increases.

Its conclusions drew swift condemnation from many Democrats and liberal economists, who accused the administration of “cherry-picking” economic evidence to sweeten Mr. Trump’s pitch to American workers.