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Formula example: 5% ÷ 365 = daily rate x No. of days late x tax = interest due

Year 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr
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 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%

As established by 26 USCA 6621, According to Section 40-1-44, Code of Alabama 1975. According to Section 40-1-44 of the Code of Alabama 1975, the Alabama Department of Revenue will calculate interest on underpayments and overpayments (where applicable) at the same annual rate, with the exception of land sold by the state for taxes, which shall be calculated at 12% as provided for under Section 40-5-9.