Find IRS forms, instructions, publications, and notices for prior years back to 1864. View more information about Using IRS Forms, Instructions, Publications and Other Item Files. Click on a column heading to sort the list by the contents of that column. Enter a term in the Find box Click the Search button Showing 76 - 83 of 83Find Help Find Prior Year » RegExReplace » Product Number Prior Year » Revision Date Prior Year » Title Show per page 2550100200 SearchClear Product Number Title Revision Date Form 8879-C IRS e-file Signature Authorization for Form 1120 2010 Form 8879-C IRS e-file Signature Authorization for Form 1120 2009 Form 8879-C IRS e-file Signature Authorization for Form 1120 2008 Form 8879-C IRS e-file Signature Authorization for Form 1120 2007 Form 8879-C IRS e-file Signature Authorization for Form 1120 2006 Form 8879-C IRS e-file Signature Authorization for Form 1120 2005 Form 8879-C IRS e-file Signature Authorization for Form 1120 2004 Form 8879-C IRS e-file Signature Authorization for Form 1120 2003 Pagination First page « First Previous page Previous Page 1 Page 2 Page 3 Current page 4