Interest Rates

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 YearJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
2023    0.81.62.43.24.04.85.66.4
20224.85.66.47.28.08.89.610.411.212.012.813.6
202110.010.811.612.413.214.014.815.616.417.218.018.8
202015.616.417.218.018.819.620.421.222.022.823.624.4
201922.423.224.024.825.626.427.228.028.829.630.431.2
201829.630.431.232.032.833.634.435.236.036.837.638.4
201736.036.837.638.439.240.040.841.642.443.244.044.8
201641.242.042.843.644.445.246.046.847.648.449.250.0
201546.046.847.648.449.250.050.851.652.453.254.054.8
201450.851.652.453.254.054.855.656.457.258.058.859.6
201355.656.457.258.058.859.660.461.262.062.863.664.4

History of Interest Rates for the Iowa Department of Revenue

YearRate Per MonthRate Per Year
20240.8% per month10.0% per year
20230.5% per month6.0% per year
20220.4% per month5.0% per year
20210.5% per month6.0% per year
20200.6% per month7.0% per year
20190.6% per month7.0% per year
20180.5% per month6.0% per year
20170.4% per month5.0% per year
20160.4% per month5.0% per year
20150.4% per month5.0% per year
20140.4% per month5.0% per year
20130.4% per month5.0% per year
20120.4% per month5.0% per year
20110.4% per month5.0% per year
20100.4% per month5.0% per year
20090.7% per month8.0% per year
20080.8% per month10.0% per year
20070.8% per month10.0% per year
20060.7% per month8.0% per year
20050.5% per month6.0% per year
20040.5% per month6.0% per year
20030.6% per month7.0% per year
20020.8% per month10.0% per year
20010.9% per month11.0% per year
20000.8% per month10.0% per year
19990.8% per month10.0% per year
19980.8% per month10.0% per year
19970.8% per month10.0% per year
19960.9% per month11.0% per year
19950.8% per month9.0% per year
19940.7% per month8.0% per year
19930.8% per month9.0% per year
19920.9% per month11.0% per year
19911.0% per month12.0% per year
19900.9% per month11.0% per year
19890.8% per month9.0% per year
19880.7% per month8.0% per year
19870.8% per month9.0% per year
19860.8% per month9.0% per year
19850.8% per month10.0% per year
1984 9.0% per year
1983 14.0% per year
1982 17.0% per year
Prior to 1982 8.0% per year