The linked files are available as Microsoft Excel® files. A free Excel Viewer is available for download, if needed. Taxpayer Advocate Service: Postfiling Taxpayer Assistance Program, by Type of Primary Issue and Relief NOTE: In prior editions of the IRS Data Book, Table 11 was presented as Table 20. 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 Return to the IRS Data Book home page
