Iowa Code § 185.27
A producer who has sold soybeans and had the state assessment deducted from the sale price may, by application in writing to the board, secure a refund in the amount deducted. The refund shall be payable only when the application is 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 thereto proof of 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.
Iowa Code § 185.27
2005 Acts, ch 82, §23
Right to refund not subject to execution or transfer, §179.5A