Image by FranciscoDiez via Flickr

By Jeanne Sahadi

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.

On the bright side - such as it is - the record levels of debt issued lately have paid for stimulus and other rescue programs that prevented the economy from falling off a cliff. And the money was borrowed at very low rates.

But accumulating any more interest on what the United States owes at this point is like extreme sport: dangerous.

All the more so because interest rates will rise when private sector borrowers return to the debt market and compete with the government for capital. At that point, the country's interest payments could jack up very fast.

$4.8 trillion - Interest on U.S. debt

Related articles by Zemanta

• Payback Time: Wave of Debt Payments Facing U.S. Government (nytimes.com)