$4.8 trillion - Interest on U.S. debt

Here's a new way to think about the U.S. government's epic borrowing: More than half of the $9 trillion in debt that Uncle Sam is expected to build up over the next decade will be interest.

More than half. In fact, $4.8 trillion.

If that's hard to grasp, here's another way to look at why that's a problem.

In 2015 alone, the estimated interest due - $533 billion - is equal to a third of the federal income taxes expected to be paid that year, said Charles Konigsberg, chief budget counsel of the Concord Coalition, a deficit watchdog group. (more)