A OneTime Showing Agreement form is a legally binding agreement between the buyer's broker and the homeowner listing the property for sale. A One Time Showing Agreement is a commission agreement signed between a buyer's agent and a seller for specific named buyers.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. Why do you have to sign an agreement with a real estate agent before seeing a house? A commission agreement will say that you agree to pay the agent a commission if they sell your property during this one time showing. This resource provides information about what provisions must be included in the written agreement pursuant to the NAR settlement as well as other provisions. Wait. Why do you have to sign an agreement with a real estate agent before seeing a house? Once new rules are in place, realtors will not be able to show buyers property without a signed agreement. This agreement works well when a Realtor wants to show a buyer a FSBO (For Sale By Owner) home that is not listed in the MLS. The agreement with your real estate agent states the benefits of using the MLS and the impact that opting out of it could have when selling your property.