Over the next three decades, the Social Security system is scheduled to pay benefits $21 trillion greater than its trust fund will collect in payroll taxes and related revenues. The Medicare system is projected to run a $48 trillion shortfall. These deficits are projected to, in turn, produce $47 trillion in interest payments to the national debt. That is a combined shortfall of $116 trillion, according to data from the Congressional Budget Office. (To inflation-adjust these figures, trim by roughly one-third.)