Undergraduates with family income below $200k will be tuition-free at MIT

I never like these hard cut-offs. We should establish a name/expression for all these rules a simple wording which represents 200k=0% and eg. 250k=100% or something.

Otherwise we always have a situation where making more money suddenly leads to less net

Sometimes they are called 'cliffs' - in the UK people talk about the tax cliff at 100k income where your marginal rate increases and you lose free childcare.

It's 'not progressive', but that might not fly in the US.

i.e. in a progressive fee structure, your marginal fee if your family earns 250k would be whatever%, but that would only be due on the amount over 200k.

Agreed. For the parents who make $200,001 in income, they're screwed.

You mean there's no sliding scale here as in tax brackets? Citation please?

They don't give a lot of details, but they cover a substantial portion of the tuition for families making $200,000 or even $225,000:

https://sfs.mit.edu/undergraduate-students/the-cost-of-atten...