If Iowa receives a notice from the Secretary that an erroneous payment has been made to Iowa under these rules, Iowa must promptly pay to the Secretary, in accordance with such rules and regulations as the Secretary may prescribe, an amount equal to the amount of the erroneous payment (without regard to whether any other amounts payable to Iowa under these rules have been paid to Iowa). In the alternative, Iowa may return the erroneous payment directly to the taxpayer. If this latter alternative is used by Iowa, then Iowa must notify the Secretary of the erroneous offset being paid to the taxpayer, and the taxpayer's records will be adjusted accordingly.
Iowa Admin. Code r. 701-21.6