In the opening paragraph, make it clear that you are retiring. Your retirement resignation letter should begin with a header that states the contact information of the sender and addressee as well as the date."Crafting a retirement letter? Use a retirement resignation letter template to inform your employer that you plan to leave the workforce. Want to know how to write a retirement letter of resignation? Get the insights you need and free retirement letter template to help guide the way. Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward. Here is a sample retirement letter to notify your employer. It will serve as your official resignation letter in your employment file.