Leaving a job isn't easy. In this article, we share tips for writing a short, simple resignation letter and offer examples for you to reference when creating your own.How To Write a Resignation Letter. Here are some of the details and parts you will want to include when writing your formal resignation letter. It's a short, formal, and friendly letter that announces you're leaving the company and your current role. Include the position title and the last day you intend to work. State that you wish to quit and include your final day of work. How to Write an Immediate Letter of Resignation? In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience.