Taxes we will contribute to, and the benefits we are likely to receive, from Social Security and Medicare.

From The Wall Street Journal:

A one-earner couple with a high wage ($71,700 in 2013 dollars) retiring in 2015 can expect lifetime Social Security benefits of $640,000. The same couple can expect to get $427,000 in lifetime Medicare benefits—while paying only $111,000 in Medicare taxes. The latter figures help illustrate how Medicare, in particular, is expected to strain future federal budgets.