The IRS's enforcement revenue, which has been increasing sharply since 2002, reached $59.2 billion in fiscal year 2007, up 68% from 1998.
But it wasn't all good news for the Service - the total dollar amount of uncollected liabilities reached a 10-year high of $290 billion.
Source: Treasury Inspector General for Tax Administration’s Trends in Compliance Activities Through Fiscal Year 2007, www.ustreas.gov/tigta.