The Internal Revenue Service announced that interest rates for tax underpayments will remain at 5% for the calendar quarter beginning Oct. 1, 2018. The rate for noncorporate tax payers is based on the federal short-term rate plus 3 percentage points. This rate is determined by the IRS on a quarterly basis.
Year
Qtr 1
1/1 - 3/31
Qtr 2
4/1 - 6/30
Qtr 3
7/1 - 9/30
Qtr 4
10/1 - 12/31
2018
4%
5%
5%
5%
2017
4%
4%
4%
4%
2016
3%
4%
4%
4%
2015
3%
3%
3%
3%
2014
3%
3%
3%
3%
2013
3%
3%
3%
3%
2012
3%
3%
3%
3%
2011
3%
4%
4%
3%
2010
4%
4%
4%
4%
2009
5%
4%
4%
4%
2008
7%
6%
5%
6%
2007
8%
8%
8%
8%
2006
7%
7%
8%
8%
2005
5%
6%
6%
7%
2004
4%
5%
4%
5%
2003
5%
5%
5%
4%
2002
6%
6%
6%
6%
2001
9%
8%
7%
7%
2000
8%
9%
9%
9%
1999
7%
8%
8%
8%
1998
8%
7%
7%
7%
1997
8%
8%
8%
8%
1996
8%
7%
8%
8%
1995
8%
9%
8%
8%
1994
6%
6%
7%
8%
1993
6%
6%
6%
6%
1992
8%
7%
7%
6%
1991
10%
9%
9%
9%
1990
10%
10%
10%
10%
1989
10%
11%
11%
10%
1988
10%
9%
9%
10%
1987
8%
8%
8%
9%
1986
10%
10%
9%
9%
1985
13%
13%
11%
11%
1984
11%
11%
11%
11%
1983
16%
16%
11%
11%