Your retirement resignation letter should begin with a header that states the contact information of the sender and addressee as well as the date. 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.This article will address how to write a retirement letter of resignation and provide an example that you can use as a template for your own retirement letter. Here is a sample retirement letter to notify your employer. It will serve as your official resignation letter in your employment file. Linked below are templates for resignations and retirements. Please be certain that your letter is signed, dated correctly and addressed to your administrator. In this article, we discuss how to write a retirement letter and we provide an example letter to help you draft your own.