A listing agreement is a contract between homeowners and brokers that legally establishes how a realtor will find a property buyer on the seller's behalf. I am a sales agent and am not sure how to fill out the listing agreement form.No. Texas law does not permit dual agency. A license holder may not represent both principals as a dual agent under the revisions to TRELA. TXR 2406 can be used when the seller agrees to pay the buyer's broker through the terms of the sales contract. A listing agreement is a legally binding contract between a homeowner and the real estate agent or broker who will be listing the property for sale. Complete both (1) and (2). The two agents will share responsibility for marketing the property, arranging showings, and getting the house from contract to close. Note: The Texas Association of Realtors and TREC update promulgated forms regularly. When completing the listing agreement, you and your agent will agree on the amount of the real estate commission.