4 Computation of interest on overpayments. If the amount of tax determined to be due

by the department is less than the amount paid, the excess to be refunded will accrue interest from the first day of the second calendar month following the date of payment or the date the return was due to be filed or was filed, whichever is the later. This rule is intended to implement Iowa Code section 422.25. [Editorial change: IAC Supplement 11/2/22] [Filed 12/12/74] [Filed 12/10/76, Notice 9/22/76—published 12/29/76, effective 2/2/77] [Filed emergency 6/6/80—published 6/25/80, effective 6/6/80] [Filed emergency 7/17/80—published 8/6/80, effective 7/17/80] [Filed 12/5/80, Notice 10/29/80—published 12/24/80, effective 1/28/81] [Filed 9/11/81, Notice 8/5/81—published 9/30/81, effective 11/4/81] [Filed 11/20/81, Notice 10/14/81—published 12/9/81, effective 1/13/82] [Filed 12/13/81, Notice 11/25/81—published 1/20/82, effective 2/24/82] [Filed 9/23/82, Notice 8/18/82—published 10/13/82, effective 11/17/82] [Filed 11/19/82, Notice 10/13/82—published 12/8/82, effective 1/12/83] [Filed 7/27/84, Notice 6/20/84—published 8/15/84, effective 9/19/84] [Filed 10/19/84, Notice 9/12/84—published 11/7/84, effective 12/12/84] [Filed 2/8/85, Notice 1/2/85—published 2/27/85, effective 4/3/85] [Filed 5/31/85, Notice 4/24/85—published 6/19/85, effective 7/24/85] [Filed 9/5/86, Notice 7/30/86—published 9/24/86, effective 10/29/86] [Filed emergency 11/14/86—published 12/17/86, effective 11/14/86] Revenue[701] IAC 2/5/25 Ch 306, p.1 [Filed 1/4/91, Notice 11/28/90—published 1/23/91, effective 2/27/91] [Filed 11/4/04, Notice 9/29/04—published 11/24/04, effective 12/29/04] [Filed ARC 9103B (Notice ARC 8944B, IAB 7/28/10), IAB 9/22/10, effective 10/27/10] [Filed ARC 9820B (Notice ARC 9740B, IAB 9/7/11), IAB 11/2/11, effective 12/7/11] [Editorial change: IAC Supplement 11/2/22] [Editorial change: IAC Supplement 10/18/23] Revenue[701] Ch 306, p.2 IAC 2/5/25