Linked below are templates for resignations and retirements. Please be certain that your letter is signed, dated correctly and addressed to your administrator.What do you write in a teacher Retirement Letter? A resignation letter should be written at least 30 days prior to the effective date of resignation. 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. In the opening paragraph, make it clear that you are retiring. Supporting Documents. A public officer may resign his office at any time. Officers are advised to give at least one months notice or pay one month's salary in lieu thereof. In the opening paragraph, make it clear that you are retiring.