This article is by the Institute For Policy Studies. The whole report can be downloaded using the link at the bottom of the article.
Accounting games like "transfer pricing" have sent the corporate share of federal revenues plummeting. In 1945, U.S. corporate income taxes added up to 35 percent of all federal government revenue. This year, corporate income taxes will make up just 9 percent of federal receipts. In 1952, the year Republican President Dwight Eisenhower was elected, the effective income tax rate for corporations was 52.8 percent. Last year it was just 10.5 percent.
http://www.ips-dc.org/reports/executive_excess_2011_the_massive_ceo_rewa...