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. A letter of resignation should be submitted at least two weeks prior to termination of employment. Use this resignation letter sample as a model to advise your employer that you are resigning because you are leaving the workforce. Address the right people. Kalra, who was appointed on October 8, submitted his resignation on October 24.