A repeal of the rules governing the way the United States taxes the foreign earnings of U.S. companies could have dramatically adverse effects on U.S. jobs and investment and leave U.S. companies less competitive in global markets, according to a new economic report released today.

The report, authored by Robert J. Shapiro, a former Clinton Administration economic official, and Aparna Mathur, a Research Fellow at the American Enterprise Institute, found that as many as 2.2 million American jobs could be affected by a repeal, or effective repeal, of  "tax deferral."