A globalized economy has been the driving force behind cross-border tax transparency and increased dissemination of tax information in recent years.  The importance of F.A.T.C.A. reporting has paled as the O.E.C.D. Common Reporting Standard has taken effect in the E.U., State Aid cases are progressing, and country-by-country reports may be publicly available.  Europe and the U.S. are moving in different directions.  Philip R. Hirschfeld and Stanley C. Ruchelman explain.