"For tax year 2010 (the most recent information available), profitable U.S. corporations that filed a Schedule M-3 paid U.S. federal income taxes amounting to about 13 percent of the pretax worldwide income that they reported in their financial statements"
What is total US corporate profit before taxes per year? And what's 27.9 percent of that.
Or from GAO: http://www.gao.gov/assets/660/654957.pdf
"For tax year 2010 (the most recent information available), profitable U.S. corporations that filed a Schedule M-3 paid U.S. federal income taxes amounting to about 13 percent of the pretax worldwide income that they reported in their financial statements"
https://en.wikipedia.org/wiki/Repatriation_tax_holiday dropped actual tax rate to 5.25% in 2004. Companies are more than happy to wait for the next one.
PS: Also of note a lot of overseas profit is anything as it's easy to pretend US operations only break even by shifting around costs on paper.