"The highest-income 40 percent of households (those with incomes above $74,000) owe almost 60 percent of the outstanding education debt and make almost three-quarters of the payments. The lowest-income 40 percent of households hold just under 20 percent of the outstanding debt and make only 10 percent of the payments. It should be no surprise that higher-income households owe more student debt than others. Students from higher-income households are more likely to go to college in the first place. And workers with a college or graduate degree earn substantially more in the labor market than those who never went to college."

https://www.brookings.edu/blog/up-front/2020/10/09/who-owes-the-most-in-student-loans-new-data-from-the-fed/