421.8  Penalty for defective return under certain circumstances.
  If a person files a purported return of tax which does not contain information on which the substantial correctness of the self-assessment may be judged or which contains information that on its face indicates that the self-assessment is substantially incorrect and the conduct previously referred to in this section is due to a position which is frivolous or a desire which appears on the purported return to delay or impede the administration of the tax laws of this state, then the person shall pay a penalty of five hundred dollars. This penalty shall be in addition to any other penalty provided by law.
86 Acts, ch 1007, §17
Waiver of penalty or interest on timely amendments to 2008 returns for taxpayers relying in good faith on Iowa’s conformity to federal treatment of disaster-related casualty losses in computing net income for state tax purposes; waiver applies retroactively to January 1, 2008, for tax years beginning on or after that date and before January 1, 2009; 2010 Acts, ch 1193, §211, 212