A One Time Showing Agreement is a commission agreement signed between a buyer's agent and a seller for specific named buyers. A OneTime Showing Agreement form is a legally binding agreement between the buyer's broker and the homeowner listing the property for sale.MLS Participants must include the disclosure in the listing agreement, if the listing agreement is not a government-specified form. Applicants and licensees may submit one-time payments online in place of sending a check or money order. Illinois Legal Aid Online provides a guided interview called an Easy Form that will help you fill out the forms. If you fill out a form on a webpage, you will lose your progress. 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. NAR offers a number of other forms to members and association staff which are not transaction-related: Real Estate Business Letter Templates. What Type of Contract This Time? Larry Gray is selling the home he grew up in.