A retainer agreement is a contract between a client and a professional who requires an upfront payment applied to future work. Addressed, stamped envelope is enclosed for your convenience in returning this signed Retainer agreement.We're going to walk you through how to set up a retainer services agreement and show you how to get it signed for free electronically. This client Retainer Agreement is for ongoing service agreements between a client and consultant or contractor. A fee retainer agreement a type is a contract where a client or customer pays in advance for professional services and work product to be specified later. At the time of the execution of this agreement, the Client shall tender to. Receives a contract for CoC or ESG funds from a recipient to carry out a project.