Iowa Administrative Code Title 701 — Department of Revenue
Iowa Admin. Code r. 701—306.3(422) — Computation of interest on refunds resulting from net operating losses
If the amount of tax is reduced as a result of a net operating loss or net capital loss, interest shall accrue on the refund resulting from the loss carryback beginning on the date a claim for refund or amended return carrying back the net operating loss or net capital loss is filed with the department or on the first day of the second calendar month following the date of the actual payment, whichever is later.
Source: official text