Save time writing your resignation or retirement letter with these customizable, stress-free templates. In this article, we discuss how to write a retirement letter and we provide an example letter to help you draft your own.Include the position title and the last day you intend to work. In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience. If you plan to hand in a physical copy of your simple resignation letter, use this sample. B. Oral resignation or retirement. After many years at XYZ Company, I'm glad to submit this resignation letter. In the opening paragraph, make it clear that you are retiring.