An effective resignation letter includes your name, your job title and your departure date. Fill out the required heading information.A resignation letter should be written at least 30 days prior to the effective date of resignation. Learn how to write a teacher resignation letter and access our form template to ease the process. Write, send and print your letter here. Use our Teacher Resignation Letter template to give notification that you are leaving your position. Leave your school on good terms using our document. The letter can be 2-3 sentences. Just say you are resigning with the effective date. Need to know how to write a resignation letter for teaching?