Harvard has waived tuition fees for lower-earning families for over two decades. It's now expanding the offering to families earning $200,000 or less a year.

In November, MIT announced that students whose families make less than $200,000 will be able to attend tuition-free this fall. Similarly to Harvard, students whose families make less than $100,000 will pay nothing at all. Those income limits are from previous limits of $140,000 and $75,000 respectively.