IRC 6621 Table of Underpayment Rates

Date (a)(2)
Underpayment Rates
(c)(1)
Underpayment Rates
October 1 – December 31, 2016 4% 6%
July 1 – September 30, 2016 4% 6%
April 1 – June 30, 2016 4% 6%
January 1 – March 31, 2016 3% 5%
October 1 – December 31, 2015 3% 5%
July 1 – September 30, 2015 3% 5%
April 1 – June 30, 2015 3% 5%
January 1 – March 31, 2015 3% 5%
October 1 – December 31, 2014 3% 5%
July 1 – September 30, 2014 3% 5%
April 1 – June 30, 2014 3% 5%
January 1 – March 31, 2014 3% 5%
October 1 – December 31, 2013 3% 5%
July 1 – September 30, 2013 3% 5%
April 1 – June 30, 2013 3% 5%
January 1 – March 31, 2013 3% 5%
October 1 – December 31, 2012 3% 5%
July 1 – September 30, 2012 3% 5%
April 1 – June 30, 2012 3% 5%
January 1 – March 31, 2012 3% 5%
October 1 – December 31, 2011 3% 5%
July 1 – September 30, 2011 4% 6%
April 1 – June 30, 2011 4% 6%
January 1 – March 31, 2011 3% 5%
October 1 – December 31, 2010 4% 6%
July 1 – September 30, 2010 4% 6%
April 1 – June 30, 2010 4% 6%
January 1 – March 31, 2010 4% 6%
October 1 – December 31, 2009 4% 6%
July 1 – September 30, 2009 4% 6%
April 1 – June 30, 2009 4% 6%
January 1 – March 31, 2009 5% 7%
October 1 – December 31, 2008 6% 8%
July 1 – September 30, 2008 5% 7%
April 1 – June 30, 2008 6% 8%
January 1 – March 31, 2008 7% 9%
October 1 – December 31, 2007 8% 10%
July 1 – September 30, 2007 8% 10%
April 1 – June 30, 2007 8% 10%
January 1 – March 31, 2007 8% 10%
October 1 – December 31. 2006 8% 10%
July 1 – September 30, 2006 8% 10%
April 1 – June 30, 2006 7% 9%
January 1 – March 31, 2006 7% 9%
October 1 – December 31, 2005 7% 9%
July 1 – September 30, 2005 6% 8%
April 1 – June 30, 2005 6% 8%
January 1 – March 31, 2005 5% 7%
October 1 – December 31, 2004 5% 7%
July 1 – September 30, 2004 4% 6%
April 1 – June 30, 2004 5% 7%
January 1 – March 31, 2004 4% 6%
October 1 – December 31, 2003 4% 6%
July 1 – September 30, 2003 5% 7%
April 1 – June 30, 2003 5% 7%
January 1 – March 31, 2003 5% 7%
October 1 – December 31, 2002 6% 8%
July 1 – September 30, 2002 6% 8%
April 1 – June 30, 2002 6% 8%
January 1 – March 31, 2002 6% 8%
October 1 – December 31, 2001 7% 9%
July 1 – September 30, 2001 7% 9%
April 1 – June 30, 2001 8% 10%
January 1– March 31, 2001 9% 11%
October 1 – December 31, 2000 9% 11%
July 1 – September 30, 2000 9% 11%
April 1 – June 30, 2000 9% 11%
January 1 – March 31, 2000 8% 10%
October 1 – December 31, 1999 8% 10%
July 1 – September 30, 1999 8% 10%
April 1 – June 30, 1999 8% 10%
January 1 – March 31, 1999 7% 9%
October 1 – December 31, 1998 8% 10%
July 1 – September 30, 1998 8% 10%
April 1 – June 30, 1998 8% 10%
January 1 – March 31, 1998 9% 11%
October 1 – December 31, 1997 9% 11%
July 1 – September 30, 1997 9% 11%
April 1 – June 30, 1997 9% 11%
January 1 – March 31, 1997 9% 11%
October 1 – December 31, 1996 9% 11%
July 1 – September 30, 1996 9% 11%
April 1 – June 30, 1996 8% 10%
January 1 – March 31, 1996 9% 11%
October 1 – December 31, 1995 9% 11%
July 1 – September 30, 1995 9% 11%
April 1 – June 30, 1995 10% 12%
January 1 – March 31, 1995 9% 11%
October 1 – December 31, 1994 9% 11%
July 1 – September 30, 1994 8% 10%
April 1 – June 30, 1994 7% 9%
January 1 – March 31, 1994 7% 9%
October 1 – December 31, 1993 7% 9%
July 1 – September 30, 1993 7% 9%
April 1 – June 30, 1993 7% 9%
January 1 – March 31, 1993 7% 9%
October 1 – December 31, 1992 7% 9%
July 1 – September 30, 1992 8% 10%
April 1 – June 30, 1992 8% 10%
January 1 – March 31, 1992 9% 11%
October 1 – December 31, 1991 10% 12%
July 1 – September 30, 1991 10% 12%
April 1 – June 30, 1991 10% 12%
January 1 – March 31, 1991 11% 13%
October 1 – December 31, 1990 11% N/A
July 1 – September 30, 1990 11% N/A
April 1  –  June 30, 1990 11% N/A
January 1 – March 31, 1990 11% N/A