There is no license for a manager. There is an old stigma that managers cannot negotiate your contracts. The fact of the matter is that it depends on the State in which they work; since managers do not have a union to regulate them and provide them with rules and regulations, managers must abide by their own State Business Code. New York State Business Code allows managers to negotiate a client's contracts if their client is not represented by a licensed agent. The State Code of California, however, states that managers are not allowed to negotiate contracts on behalf of their clients with or without an agent.