Iowa Code § 185C.27
A producer who has sold corn and had a state assessment deducted from the sale price, by application in writing to the board, may secure a refund in the amount deducted. The refund shall be payable only when the application shall have been made to the board within sixty days after the deduction. Application forms shall be given by the board to each first purchaser when requested and the first purchaser shall make the applications available to any producer. Each application for refund by a producer shall have attached to the application proof of the assessment deducted. The proof of assessment may be in the form of a duplicate or certified copy of the purchase invoice by the first purchaser. The board shall have thirty days from the date the application for refund is received to remit the refund to the producer. The board may provide for refunds of a federal assessment as provided by federal law. Unless inconsistent with federal law, refunds shall be made under section 185C.26.
Iowa Code § 185C.27
89 Acts, ch 198, §16
Right to refund not subject to execution or transfer, §179.5A