The numbers are from last year, but should be similar for this year. Harvard offers generous financial aid to low- to upper middle-income families, providing incentive for many students to reach for the brass ring of a Harvard degree.
From the Harvard website:
Our current financial aid policy has dramatically reduced the amount families with incomes below $180,000 are expected to pay, and parents of families with incomes below $60,000 are not expected to contribute at all to college costs. We no longer consider home equity as a resource in our determination of a family contribution, and students are not expected to take out loans, which have been replaced by need-based Harvard scholarship. This program has reduced the cost to middle income families making the price of a Harvard education for students on financial aid comparable to the cost of in-state tuition and fees at the nation’s leading public universities. For a more detailed explanation of our program, please click here.