701—12.12 (422) Extension of time for filing. Upon a proper showing of the necessity for extending the due date, the director is authorized to grant an extension of time in which to file a return. The extension shall not be granted for a period longer than 30 days. The request for the extension must be received on or before the original due date of the return. It will be granted only if the person requesting the extension shall have paid by the twentieth day of the month following the close of such quarter, 90 percent of the estimated tax due.
This rule is intended to implement Iowa Code section 422.51.