How to write a resignation letter that's effective immediately? Learn how to write a short notice resignation letter with samples.Find a solution to the challenge of resigning on short notice. In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience. In this article, we explain how to construct a formal resignation letter as well as provide an example to help you write your own. To resign from your position, complete and submit a resignation letter to your supervisor at least two weeks, or as soon as possible, before your last day. Typically, a twoweek notice period is standard, unless otherwise specified in the employment contract. Lack of Clarity About Resignation Date. 2 The most important information to include in a resignation letter is the date you plan to leave the company. Employers may also want to consider the impact an immediate separation would have on remaining employees.