We have provided free online forms for partition actions that should only be used in conjunction with a partition attorney in California. What is a Retainer Agreement?A retainer agreement is a work-for-hire legal document or a service contract between a company or an individual and a client. You are entitled to fully understand the proposed rates and retainer fee before you sign a retainer agreement, as in any other contract. It outlines the terms of a non-refundable true retainer, including advance payment of an initial two-month retainer and monthly retainers thereafter.