The Iowa Release of Retain age Request is a document used to request the release of retain age funds from the Iowa Department of Transportation (DOT). Retain age is a portion of a contract payment withheld by the Iowa DOT until the contract is completed and approved. A Release of Retain age Request must be completed and submitted by the contractor when the contract is finished and all obligations are met. There are two types of Iowa Release of Retain age Request: Release of Retain age Request for Construction Contracts and Release of Retain age Request for Professional Services Contracts. The Release of Retain age Request for Construction Contracts must be completed by the contractor and submitted to the Iowa DOT with a copy of the Request for Payment. The Release of Retain age Request for Professional Services Contracts must be completed by the contractor and submitted to the Iowa DOT with a copy of the Final Invoice and Certificate of Completion. Both documents must be signed by the contractor and a representative of the Iowa DOT.