Transactional lawyers can use this sample form when drafting a letter to engage generic professional service providers for clients. These forms are provided in a fillable PDF format, which allows you to enter data directly into the form using your computer and Adobe Acrobat Reader.CCAC forms library is one place to look for a form or document that a student or person may need. In this guide, we'll walk you through how to create a professional tax engagement letter and provide a free template to simplify the process. The purpose of this Engagement Letter is to set out and confirm the terms of engagement between our firm and you. Please refer to the chart below for Tax and Fee information. For any questions, call Option 2 for Business Tax. The sample letter consists of the following sections: Introduction. Description of the Engagement (2 options). Responsibility. A letter of engagement is one means of ensuring you are providing a professional service to your clients.