The legislation, released Monday, would create a tiered tax on college endowments, a collection of donations and investments that pay for salaries, research, financial aid and other expenses. Instead of the current 1.4 percent tax on the net investment income of private schools with an endowment of more than $500,000 per student, House Republicans want to raise that tax as high as 21 percent. 

It is unclear at the moment exactly how many schools would be subject to the new rate. Under current law, 56 colleges and universities paid a total of $381 million in endowment taxes in 2023, according to the latest data from the IRS. The vast majority of college students attend institutions with a fraction of the endowments held by the nation’s wealthiest schools. Still, the proposal targets institutions that do a lot of the heavy lifting in research.