What is the actual rate paid by the top five or ten (you pick the reasonable number) grossing US firms?
For every dollar of net earnings in the U.S. between 2006 and 2010, ExxonMobil incurred $1.45 in taxes to federal, state and local governments. When one looks at the total taxes incurred on ExxonMobils 2010 activities, they amounted to over $93 billion more than three times our earnings. Over 24 percent of ExxonMobils revenue went to taxes around the world.
Corporate tax law....one of the many ways that big corporations controls government, while simultaneously fooling stupid people into thinking it's beneficial the US as a whole.