What do you write in a teacher Retirement Letter? Your last day of employment is August 20.I am paid through the summer for my contract, but I plan to end service in the middle of a pay period. The purpose of this information is to aide you with step-by-step instructions as you begin the retirement or resignation process. This is a set of three editable letters to a principal or administrator, announcing a teacher's retirement. It is in powerpoint format for easy editing. Frequently Asked Questions.