January 1, 2024 through December 31, 2024
Yearly: 10.0%
Monthly: 0.8%
Daily: 0.027322%
Interest Rate Table
For Amended Returns Filed in Calendar Year 2024 Only
If there is additional tax due on the return, interest on the unpaid tax is to be computed using the table below. To find the applicable rate, find the tax year for which you are amending your return in the left hand column. Then go to the right until you reach the column for the month in 2024 in which the amended return is filed.
Tax Year | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC |
2023 | 0.8 | 1.6 | 2.4 | 3.2 | 4.0 | 4.8 | 5.6 | 6.4 | ||||
2022 | 4.8 | 5.6 | 6.4 | 7.2 | 8.0 | 8.8 | 9.6 | 10.4 | 11.2 | 12.0 | 12.8 | 13.6 |
2021 | 10.0 | 10.8 | 11.6 | 12.4 | 13.2 | 14.0 | 14.8 | 15.6 | 16.4 | 17.2 | 18.0 | 18.8 |
2020 | 15.6 | 16.4 | 17.2 | 18.0 | 18.8 | 19.6 | 20.4 | 21.2 | 22.0 | 22.8 | 23.6 | 24.4 |
2019 | 22.4 | 23.2 | 24.0 | 24.8 | 25.6 | 26.4 | 27.2 | 28.0 | 28.8 | 29.6 | 30.4 | 31.2 |
2018 | 29.6 | 30.4 | 31.2 | 32.0 | 32.8 | 33.6 | 34.4 | 35.2 | 36.0 | 36.8 | 37.6 | 38.4 |
2017 | 36.0 | 36.8 | 37.6 | 38.4 | 39.2 | 40.0 | 40.8 | 41.6 | 42.4 | 43.2 | 44.0 | 44.8 |
2016 | 41.2 | 42.0 | 42.8 | 43.6 | 44.4 | 45.2 | 46.0 | 46.8 | 47.6 | 48.4 | 49.2 | 50.0 |
2015 | 46.0 | 46.8 | 47.6 | 48.4 | 49.2 | 50.0 | 50.8 | 51.6 | 52.4 | 53.2 | 54.0 | 54.8 |
2014 | 50.8 | 51.6 | 52.4 | 53.2 | 54.0 | 54.8 | 55.6 | 56.4 | 57.2 | 58.0 | 58.8 | 59.6 |
2013 | 55.6 | 56.4 | 57.2 | 58.0 | 58.8 | 59.6 | 60.4 | 61.2 | 62.0 | 62.8 | 63.6 | 64.4 |
History of Interest Rates for the Iowa Department of Revenue
Year | Rate Per Month | Rate Per Year |
---|---|---|
2024 | 0.8% per month | 10.0% per year |
2023 | 0.5% per month | 6.0% per year |
2022 | 0.4% per month | 5.0% per year |
2021 | 0.5% per month | 6.0% per year |
2020 | 0.6% per month | 7.0% per year |
2019 | 0.6% per month | 7.0% per year |
2018 | 0.5% per month | 6.0% per year |
2017 | 0.4% per month | 5.0% per year |
2016 | 0.4% per month | 5.0% per year |
2015 | 0.4% per month | 5.0% per year |
2014 | 0.4% per month | 5.0% per year |
2013 | 0.4% per month | 5.0% per year |
2012 | 0.4% per month | 5.0% per year |
2011 | 0.4% per month | 5.0% per year |
2010 | 0.4% per month | 5.0% per year |
2009 | 0.7% per month | 8.0% per year |
2008 | 0.8% per month | 10.0% per year |
2007 | 0.8% per month | 10.0% per year |
2006 | 0.7% per month | 8.0% per year |
2005 | 0.5% per month | 6.0% per year |
2004 | 0.5% per month | 6.0% per year |
2003 | 0.6% per month | 7.0% per year |
2002 | 0.8% per month | 10.0% per year |
2001 | 0.9% per month | 11.0% per year |
2000 | 0.8% per month | 10.0% per year |
1999 | 0.8% per month | 10.0% per year |
1998 | 0.8% per month | 10.0% per year |
1997 | 0.8% per month | 10.0% per year |
1996 | 0.9% per month | 11.0% per year |
1995 | 0.8% per month | 9.0% per year |
1994 | 0.7% per month | 8.0% per year |
1993 | 0.8% per month | 9.0% per year |
1992 | 0.9% per month | 11.0% per year |
1991 | 1.0% per month | 12.0% per year |
1990 | 0.9% per month | 11.0% per year |
1989 | 0.8% per month | 9.0% per year |
1988 | 0.7% per month | 8.0% per year |
1987 | 0.8% per month | 9.0% per year |
1986 | 0.8% per month | 9.0% per year |
1985 | 0.8% per month | 10.0% per year |
1984 | 9.0% per year | |
1983 | 14.0% per year | |
1982 | 17.0% per year | |
Prior to 1982 | 8.0% per year |