In the opening paragraph, make it clear that you are retiring. In the body of the letter, state your intended retirement date (your last day) and your thoughts on a transition plan.Check out our letter of retirement to employer selection for the very best in unique or custom, handmade pieces from our templates shops. If you plan to hand in a physical copy of your simple resignation letter, use this sample. Career Contessa states that the purpose of a resignation letter is simply to convey the fact you you are leaving. How Does a Retirement Letter Differ from a Notice of Resignation? Check out our simple retirement letter template selection for the very best in unique or custom, handmade pieces from our templates shops. For those in more traditionally professional fields such as law, finance or politics a formal resignation letter may be more appropriate.