All that is required in California is to notify the listing agent in writing. It does need to be in writing.You simply tell her you want to cancel the Listing Agreement. There is a form you must fill out to do so. By signing below, Seller acknowledges that Seller has read, understands, received a copy of and agrees to the terms of this Agreement. PRDS has recently released its Listing Agreement Amendment form ("LAA"). " Briefly state your reason for ending the agreement and refer to the contract's termination clause (if there is one). The simplest way to terminate a listing agreement is through mutual consent. A listing withdrawal form is used in real estate to formally request the removal or withdrawal of a property listing from a real estate agency or website. Listing agreement, which requires that a specific termination date be filled in.