This is very bad news. Graduate students are already poor (stipend is already low to begin with and fixed for the duration of study). A very bad policy for grad students.
The tax overhaul passed Thursday by House Republicans could cost graduate students thousands of dollars, prompting a backlash from students and university leaders who say the proposal could make graduate degrees unaffordable, especially for low-income students.
A provision tucked away in the House’s bill would count the tuition discounts given to many grad students as income, meaning that students would pay taxes on tens of thousands of dollars that they never see. The bill would double or even triple many students’ taxes.
Source: PhD Comics