New York State Commission on Ethics and Lobbying in Government. Find actionable tips for a smooth transition, plus a contract termination letter sample to guide your writing.Figure out what to say in a client termination letter to ensure a professional exit and use our letter template to save time. This article will provide a detailed guide to professionally terminating a contract, including 3 contract termination sample letters and analysis. Below is a sample of a termination letter from a cleaning company. You can download our free template to personalize your own letter. This section identifies the existing agreement that's being modified and explains where your right to terminate the document comes from. 1. Recipient's Name: The name of the client receiving the termination letter.