Interest Rates

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On January 1 of each year, the Arizona Department of Revenue (ADOR) will add any outstanding interest as of that date to the principal amount of tax still owed. This compounding interest is then calculated on the new tax principal amount.

The department applies interest, compounded annually, in the same manner and at the same time as prescribed by the U.S. Internal Revenue Code (IRC), Section 6621. However, that rate of interest for both overpayments and underpayments for all taxpayers is the federal short-term rate, determined by the IRC, plus three percentage points.

 

PERIOD COMPOUND POINT DAYS/YEAR BASE UNDERPAYMENT RATE OVERPAYMENT RATE
BEGINNING ENDING ANNUAL DAILY ANNUAL DAILY

**INT THRU

  

SS

          
1/1/2021 3/31/2021   365 3% 0.0000822 3% 0.0000822
4/1/2021 6/30/2021    365 3% 0.0000822 3% 0.0000822
7/1/2021 9/30/2021   365 3% 0.0000822 3% 0.0000822
10/1/2021 12/31/2021   365        

**INT THRU

  

SS

          
1/1/2020 3/31/2020   366 5% 0.0001366 5% 0.0001366
4/1/2020 6/30/2020    366 5% 0.0001366 5% 0.0001366
7/1/2020 9/30/2020   366 3% 0.0000820 3% 0.0000820
10/1/2020 12/31/2020   366 3% 0.0000820 3% 0.0000820

**INT THRU

  

SS

          
1/1/2019 3/31/2019   365 6% 0.0001644 6% 0.0001644
4/1/2019 6/30/2019    365 6% 0.0001644 6% 0.0001644
7/1/2019 9/30/2019   365 5% 0.0001370 5% 0.0001370
10/1/2019 12/31/2019   365 5% 0.0001370 5% 0.0001370

**INT THRU

  

SS

          
1/1/2018 3/31/2018   365 4% 0.0001096 4% 0.0001096
4/1/2018 6/30/2018    365 5% 0.0001370 5% 0.0001370
7/1/2018 9/30/2018   365 5% 0.0001370 5% 0.0001370
10/1/2018 12/31/2018   365 5% 0.0001370 5% 0.0001370

**INT THRU

  

SS

          
1/1/2017 3/31/2017   365 4% 0.0001096 4% 0.0001096
4/1/2017 6/30/2017    365 4% 0.0001096 4% 0.0001096
7/1/2017 9/30/2017   365 4% 0.0001096 4% 0.0001096
10/1/2017 12/31/2017   365 4% 0.0001096 4% 0.0001096

**INT THRU

  

SS

          
1/1/2016 3/31/2016   366 3% 0.0000820 3% 0.0000820
4/1/2016 6/30/2016    366 4% 0.0001093 4% 0.0001093
7/1/2016 9/30/2016   366 4% 0.0001093 4% 0.0001093
10/1/2016  12/31/2016   366 4% 0.0001093 4% 0.0001093

**INT THRU

  

SS

          
1/1/2015 3/31/2015   365 3% 0.0000822 3% 0.0000822
4/1/2015 6/30/2015   365 3% 0.0000822 3% 0.0000822
7/1/2015 9/30/2015   365 3% 0.0000822 3% 0.0000822
10/1/2015 12/31/2015   365 3% 0.0000822 3% 0.0000822
**INT THRU   SS          
1/1/2014 3/31/2014   365 3% 0.0000822 3% 0.0000822
4/1/2014 6/30/2014   365 3% 0.0000822 3% 0.0000822
7/1/2014 9/30/2014   365 3% 0.0000822 3% 0.0000822
10/1/2014 12/31/2014   365 3% 0.0000822 3% 0.0000822
**INT THRU   SS          
1/1/2013 3/31/2013   365 3% 0.0000822 3% 0.0000822
4/1/2013 6/30/2013   365 3% 0.0000822 3% 0.0000822
7/1/2013 9/30/2013   365 3% 0.0000822 3% 0.0000822
10/1/2013 12/31/2013   365 3% 0.0000822 3% 0.0000822
**INT THRU   SS        

 
1/1/2012 3/31/2012   366 3% 0.0000820 3% 0.0000820
4/1/2012 6/30/2012   366 3% 0.0000820 3% 0.0000820
7/1/2012 9/30/2012   366 3% 0.0000820 3% 0.0000820
10/1/2012 12/31/2012   366 3% 0.0000820 3% 0.0000820
**INT THRU         SS          
1/1/2011 3/31/2011   365 3% 0.0000822 3% 0.0000822
4/1/2011 9/30/2011   365 4% 0.0001096 4% 0.0001096
10/1/2011 12/31/2011   365 3% 0.0000822 3% 0.0000822
**INT THRU         SS          
1/1/2010 12/31/2010   365 4% 0.0001096   4% 0.0001096
**INT THRU         SS          
1/1/2009 3/31/2009   365 5% 0.0001370 5% 0.0001370
4/1/2009 12/31/2009   365 4% 0.0001096 4% 0.0001096
**INT THRU   SS          
1/1/2008 3/31/2008   366 7% 0.0001913 7% 0.0001913
4/1/2008 6/30/2008   366 6% 0.0001639 6% 0.0001639
7/1/2008 9/30/2008   366 5% 0.0001366 5% 0.0001366
10/1/2008 12/31/2008   366 6% 0.0001639 6% 0.0001639
**INT THRU   SS          
1/1/2007 12/31/2007   365 8% 0.0002192 8% 0.0002192
**INT THRU   SS          
1/1/2006 6/30/2006   365 7% 0.0001918 7% 0.0001918
7/1/2006 12/31/2006   365 8% 0.0002192 8% 0.0002192
**INT THRU   SS          
1/1/2005 3/31/2005   365 5% 0.0001370 5% 0.0001370
4/1/2005 9/30/2005   365 6% 0.0001644 6% 0.0001644
10/1/2005 12/31/2005   365 7% 0.0001918 7% 0.0001918
**INT THRU   SS          
1/1/2004 3/31/2004   366 4% 0.0001093 4% 0.0001093
4/1/2004 6/30/2004   366 5% 0.0001366 5% 0.0001366
7/1/2004 9/30/2004   366 4% 0.0001093 4% 0.0001093
10/1/2004 12/31/2004   366 5% 0.0001366 5% 0.0001366
**INT THRU   SS          
1/1/2003 9/30/2003   365 5% 0.0001370 5% 0.0001370
10/1/2003 12/31/2003   365 4% 0.0001096 4% 0.0001096
**INT THRU   SS          
1/1/2002 12/31/2002   365 6% 0.0001644 6% 0.0001644
**INT THRU   SS          
1/1/2001 3/31/2001   365 9% 0.0002466 9% 0.0002466
4/1/2001 6/30/2001   365 8% 0.0002192 8% 0.0002192
7/1/2001 12/31/2001   365 7% 0.0001918 7% 0.0001918
**INT THRU   SS          
1/1/2000 3/31/2000   366 8% 0.0002186 8% 0.0002186
4/1/2000 12/31/2000   366 9% 0.0002459 9% 0.0002459
**INT THRU   SS          
1/1/1999 3/31/1999   365 7% 0.0001918 6% 0.0001644
4/1/1999 9/30/1999   365 8% 0.0002192 7% 0.0001918
10/1/1999 12/31/1999   365 8% 0.0002192 8% 0.0002192
**INT THRU   SS          
1/1/1998 3/31/1998   365 9% 0.0002466 8% 0.0002192
4/1/1998 12/31/1998   365 8% 0.0002192 7% 0.0001918
**INT THRU   SS          
1/1/1997 12/31/1997   365 9% 0.0002466 8% 0.0002192
**INT THRU   SS          
1/1/1996 3/31/1996   366 9% 0.0002459 8% 0.0002186
4/1/1996 6/30/1996   366 8% 0.0002186 7% 0.0001913
7/1/1996 12/31/1996   366 9% 0.0002459 8% 0.0002186
**INT THRU   SS          
1/1/1995 3/31/1995   365 9% 0.0002466 8% 0.0002192
4/1/1995 6/30/1995   365 10% 0.0002740 9% 0.0002466
7/1/1995 12/31/1995   365 9% 0.0002466 8% 0.0002192
**INT THRU   SS          
1/1/1994 6/30/1994   365 7% 0.0001918 6% 0.0001644
7/1/1994 9/30/1994   365 8% 0.0002192 7% 0.0001918
10/1/1994 12/31/1994   365 9% 0.0002466 8% 0.0002192
**INT THRU   SS          
1/1/1993 12/31/1993   365 7% 0.0001918 6% 0.0001644
**INT THRU   SS          
1/1/1992 3/31/1992   366 9% 0.0002459 8% 0.0002186
4/1/1992 9/30/1992   366 8% 0.0002186 7% 0.0001913
10/1/1992 12/31/1992   366 7% 0.0001913 6% 0.0001639
**INT THRU   SS          
1/1/1991 3/31/1991   365 11% 0.0003014 10% 0.0002740
4/1/1991 12/31/1991   365 10% 0.0002740 9% 0.0002466
**INT THRU   SS          
1/1/1990 12/31/1990   365 11% 0.0003014 10% 0.0002740
**INT THRU   SS          
1/1/1989 3/31/1989   365 11% 0.0003014 10% 0.0002740
4/1/1989 9/30/1989   365 12% 0.0003288 11% 0.0003014
10/1/1989 12/31/1989   365 11% 0.0003014 10% 0.0002740
**INT THRU   SS          
1/1/1988 3/31/1988   366 11% 0.0003014 10% 0.0002740
4/1/1988 6/30/1988   366 10% 0.0002740 9% 0.0002466
7/1/1988 9/30/1988   366 10% 0.0002732 9% 0.0002459
10/1/1988 12/31/1988   366 11% 0.0003005 10% 0.0002732
**INT THRU   SS          
1/1/1987 3/31/1987   365 9% 0.0002500 8% 0.0002222
4/1/1987 9/30/1987   365 9% 0.0002466 8% 0.0002192
10/1/1987 12/31/1987   365 10% 0.0002740 9% 0.0002466
**INT THRU   SS          
1/1/1986 6/30/1986   365 10% 0.0002778 10% 0.0002778
7/1/1986 12/31/1986   365 9% 0.0002500 9% 0.0002500
**INT THRU   SS          
1/1/1985 6/30/1985   365 13% 0.0003611 13% 0.0003611
7/1/1985 12/31/1985   365 11% 0.0003056 11% 0.0003056