Most companies in the U.S. pay no income taxes.
The Government Accountability Office said 72 percent of all foreign corporations and about 57 percent of U.S. companies doing business in the United States paid no federal income taxes for at least one year between 1998 and 2005.
More than half of foreign companies and about 42 percent of U.S. companies paid no U.S. income taxes for two or more years in that period, the report said.
During that time corporate sales in the United States totaled $2.5 trillion, according to Democratic Sens. Carl Levin of Michigan and Byron Dorgan of North Dakota, who requested the GAO study.
The report did not name any companies. The GAO said corporations escaped paying federal income taxes for a variety of reasons including operating losses, tax credits and an ability to use transactions within the company to shift income to low tax countries.