IRS Interest Rate Table

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IRS INTEREST RATE

Interest is calculated is based on how much tax you owe. Interest rates change every three months. Currently (as of March 2010) the interest rate of under payment of tax is 4% per year. The interest is calculated for each day your balance due is not paid in full. The chart below show the historical IRS interest rate by quarter.

Year	Qtr 1 1/01 - 3/31	Qtr 2 4/01 - 6/30	Qtr 3 7/01 - 9/30	Qtr 4 10/01 - 12/31
2010	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	9%	8%	8%	8%
1997	9%	9%	9%	9%
1996	9%	8%	9%	9%
1995	9%	10%	9%	9%
1994	7%	7%	8%	9%
1993	7%	7%	7%	7%
1992	9%	8%	8%	7%
1991	11%	10%	10%	10%
1990	11%	11%	11%	11%
1989	11%	12%	12%	11%
1988	11%	10%	10%	11%
1987	9%	9%	9%	10%
1986	10%	10%	9%	9%
1985	13%	13%	11%	11%
1984	11%	11%	11%	11%
1983	16%	16%	11%	11%