success fee; contingency fee; completion bonus
A payment made only when a specific goal is achieved, such as closing a deal, winning a case, or finishing a project. Common in business, legal, and freelance contexts.
We paid the lawyer a contingency fee of 20% of the settlement amount.
このプロジェクトが完了したら、成功報酬がもらえる契約になっている。
The contract stipulates that we will receive a completion bonus when this project is finished.