The commission on a listing agreement is the part of a real estate agent's contract that binds the seller to pay certain commission fees for certain acts performed by the agent. When most people think of the commission on a listing agreement, they think of the commission paid when the home finally sells. This does not have to be the case in most contracts. Most of the time, the agent is due his or her commission when they find a ready, willing and able buyer for the home. If something happens beyond that point, the agent is still entitled to the commission. In a listing agreement, the commission amount should be clearly stated. The contract should also state when the commission is due. That might mean some date that the commission comes due after the sale. It might also mean that the commission is due when the agent performs one act or another.