0 By brooke Individual Income Tax - Iowa June 14, 2012 Interest Rate for 2012 January 1, 2012, through December 31, 2012 Yearly: 5% Monthly: 0.4% Daily: 0.013661% brooke / About Author More posts by brooke Leave a comment Cancel reply Save my name, email, and website in this browser for the next time I comment. Send Comment Δ