Interest Rates for Underpayment and Overpayment of Tax

The New Hampshire statutes governing interest rates were amended in 1995 (Chp. 268, Laws of 1995) to require that, starting on January 1, 1998 and determined annually thereafter, the New Hampshire interest rates would be based upon the rates set by the federal government under Internal Revenue Code § 6621(a)(2). RSA 21-J:28, II provides that the “annual underpayment rate” (the interest rate on tax due) is tied to the underpayment rate specified in the Internal Revenue Code of 1986, as in effect on the September 1 immediately preceding such calendar year, plus 2 percentage points.

1/1/2025 to 12/31/2025	Interest Rate for Underpayment of Tax is 10%	Interest Rate for Overpayment of Tax is 7%
1/1/2024 to 12/31/2024	Interest Rate for Underpayment of Tax is 9%	Interest Rate for Overpayment of Tax is 6%
1/1/2023 to 12/31/2023	Interest Rate for Underpayment of Tax is 7%	Interest Rate for Overpayment of Tax is 4%
1/1/2021 to 12/31/2022	Interest Rate for Underpayment of Tax is 5%	Interest Rate for Overpayment of Tax is 2%
1/1/2019 to 12/31/2020	Interest Rate for Underpayment of Tax is 7%	Interest Rate for Overpayment of Tax is 4%
1/1/2017 to 12/31/2018	Interest Rate for Underpayment of Tax is 6%	Interest Rate for Overpayment of Tax is 3%
1/1/2013 to 12/31/2016	Interest Rate for Underpayment of Tax is 5%	Interest Rate for Overpayment of Tax is 2%
1/1/2010 to 12/31/2012	Interest Rate for Underpayment of Tax is 6%	Interest Rate for Overpayment of Tax is 3%
1/1/2009 to 12/31/2009	Interest Rate for Underpayment of Tax is 7%	Interest Rate for Overpayment of Tax is 4%
1/1/2007 to 12/31/2008	Interest Rate for Underpayment of Tax is 10%	Interest Rate for Overpayment of Tax is 7%
1/1/2006 to 12/31/2006	Interest Rate for Underpayment of Tax is 8%	Interest Rate for Overpayment of Tax is 5%
1/1/2005 to 12/31/2005	Interest Rate for Underpayment of Tax is 6%	Interest Rate for Overpayment of Tax is 3%
1/1/2004 to 12/31/2004	Interest Rate for Underpayment of Tax is 7%	Interest Rate for Overpayment of Tax is 4%
1/1/2003 to 12/31/2003	Interest Rate for Underpayment of Tax is 8%	Interest Rate for Overpayment of Tax is 5%
1/1/2002 to 12/31/2002	Interest Rate for Underpayment of Tax is 9%	Interest Rate for Overpayment of Tax is 6%
1/1/2001 to 12/31/2001	Interest Rate for Underpayment of Tax is 11%	Interest Rate for Overpayment of Tax is 8%
1/1/1999 to 12/31/2000	Interest Rate for Underpayment of Tax is 10%	Interest Rate for Overpayment of Tax is 7%
1/1/1998 to 12/31/1998	Interest Rate for Underpayment of Tax is 11%	Interest Rate for Overpayment of Tax is 8%
Prior to 1/1/1998	Interest Rate for Underpayment of Tax is 15%	Interest Rate for Overpayment of Tax is 10%