What is the annual Salary needed to qualify for financial aid and is it different per school?

Unanswerable. Financial aid eligibility is based on family income (not just salary), assets, and sometimes special circumstances. Some colleges offer excellent need-based aid to eligible (by their definition) families; some offer little or none. If you want to know what you will pay for a college based on your circumstances, run the net price calculator for each school. As an example, here’s the NPC for a school that has excellent aid, Williams College:

And here’e one for a college known for giving spotty aid, NYU: