| When should I file my Iowa State Corporation Tax Return?
Iowa Corporation tax returns must be filed by the last day of the 4th month after the close of the tax year.
All Iowa Cooperatives must file a return on or before the 15th day of the 9th month following the close of the cooperative’s tax year.
An Iowa Nonprofit corporation reporting unrelated business income on federal form 990-T must file an IA 1120 or IA 1120A on or before the 15th day of the 5th month following the end of the tax period. But, if the nonprofit Corporation has no unrelated business income, no Iowa return or copy of the federal return is required to be filed.
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