In late 2012 or early 2013 the U.S. federal government will again reach a statutory borrowing limit and will not be able to issue additional debt. Why is this a problem? First, because the federal government is spending considerably more than it collects in taxes; and second, because spending and tax collections are not synchronized. As a result, if the ceiling is not raised in time, the government would need to cut spending drastically, curtailing important government functions, with detrimental effects on output and employment. And just the mere possibility that the government might have to delay a payment on a bond could unsettle financial markets.