An ideal time to let them know about your resignation is after you give your two weeks' notice and understand the details of the transition process. In this article, we explain how to construct a formal resignation letter as well as provide an example to help you write your own.You've found a new job, but now you have to let your current employer know. Here are some examples of a good resignation letter to get you started. State the Position You're Resigning From With An Effective Date. Learn how to write a short notice resignation letter with samples. Find a solution to the challenge of resigning on short notice.