Use a retirement resignation letter template to inform your employer that you plan to leave the workforce. A retirement letter is a letter you can submit to your employer to formally announce your retirement and your intention to resign from your position.To write a retirement resignation letter you should state your intent to retire with a clear date in your first line of the letter. I am writing to inform you of my decision to retire from my position as (Your Job Title) at (Company Name). My last day of work will be (Date). I am writing to inform you that I will be resigning from my position as (Title) at (Company Name). In this article, we discuss how to write a retirement letter and we provide an example letter to help you draft your own.