These reports contain selected papers given at the annual meetings of the American Statistical Association and other professional conferences. The views expressed here are those of the authors and are not necessarily the official positions of the Internal Revenue Service. These reports are available in Adobe® PDF format, which requires the free Adobe Acrobat® reader to view and print the files. Select a year below to view the reports: 2006 / 2005 / 2004 / 2003 PDF Beginning in 2007 the Statistics of Income (SOI) Paper Series replaced the Special Studies in Federal Tax Statistics. The SOI Paper Series includes papers presented by SOI staff and others at professional conferences, including the Joint Statistical Meeting of the American Statistical Association and the National Tax Association’s annual conference on taxation, among others.