A One Time Showing Agreement is a commission agreement signed between a buyer's agent and a seller for specific named buyers. PAR's Buyer Agency Contract includes all of the legallyrequired language and allows for a buyer's broker fee to be structured in several ways.With the recent changes, you must sign a buyer agent agreement if an agent, besides the listing agent, will be showing you the home. A OneTime Showing Agreement form is a legally binding agreement between the buyer's broker and the homeowner listing the property for sale. The question is whether the Realtor who originally showed your house to the buyer is due a commission. By August 17 all Realtors must have a signed buyer brokerage agreement in place before showing a house to a consumer.