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.Decide on a Delivery Method. Investment advisory services are offered through Vertical Wealth Management, a Registered Investment Adviser in the state of Louisiana, Texas, and Virginia. Complete a resignation form. When I handed in my resignation letter, I divulged that I was leaving for a competitor. But before you submit a letter, you should first sit down with your manager or HR and verbally communicate your plans to leave. Career Contessa states that the purpose of a resignation letter is simply to convey the fact you you are leaving. Check out our simple retirement letter template selection for the very best in unique or custom, handmade pieces from our templates shops. A retirement resignation letter tells your employer that you plan to leave the workforce for good.