Use a formal business format for the actual letter itself. Notify your manager in person before you submit your formal resignation letter.In this article, we cover everything you need to know about writing a resignation letter without notice and provide an example to get you started. In the letter, include the date you plan to leave the company. Short, polite, to the point. "This note is to inform you that I have chosen to end my employment with XXXXX, effective immediately (today's date)." Never include your reason for leaving. Just say you resign wffective (date). Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. When you're unhappy at work, it might be time to go.